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Daniel Veillard	09ab7e1	2001-07-10 15:49:44 +0000	[diff] [blame]	1	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
				2	"http://www.w3.org/TR/html4/loose.dtd">
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	3	<html>
				4	<head>
Daniel Veillard	598bec3	2003-07-06 10:02:03 +0000	[diff] [blame]	5	<title>The XML C parser and toolkit of Gnome</title>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	6	<meta name="GENERATOR" content="amaya 5.1">
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	7	<meta http-equiv="Content-Type" content="text/html">
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	8	</head>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	9
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	10	<body bgcolor="#ffffff">
Daniel Veillard	598bec3	2003-07-06 10:02:03 +0000	[diff] [blame]	11	<h1 align="center">The XML C parser and toolkit of Gnome</h1>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	12
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	13	<h1>Note: this is the flat content of the <a href="index.html">web
				14	site</a></h1>
				15
Daniel Veillard	c948420	2001-10-24 12:35:52 +0000	[diff] [blame]	16	<h1 style="text-align: center">libxml, a.k.a. gnome-xml</h1>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	17
				18	<p></p>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	19
Daniel Veillard	7ebac02	2004-02-25 22:36:35 +0000	[diff] [blame]	20	<p
				21	style="text-align: right; font-style: italic; font-size: 10pt">"Programming
				22	with libxml2 is like the thrilling embrace of an exotic stranger." <a
				23	href="http://diveintomark.org/archives/2004/02/18/libxml2">Mark
				24	Pilgrim</a></p>
				25
Daniel Veillard	598bec3	2003-07-06 10:02:03 +0000	[diff] [blame]	26	<p>Libxml2 is the XML C parser and toolkit developed for the Gnome project
Daniel Veillard	23a52c5	2003-08-18 10:01:18 +0000	[diff] [blame]	27	(but usable outside of the Gnome platform), it is free software available
Daniel Veillard	eec1ae9	2003-09-09 13:11:01 +0000	[diff] [blame]	28	under the <a href="http://www.opensource.org/licenses/mit-license.html">MIT
				29	License</a>. XML itself is a metalanguage to design markup languages, i.e.
				30	text language where semantic and structure are added to the content using
				31	extra "markup" information enclosed between angle brackets. HTML is the most
				32	well-known markup language. Though the library is written in C <a
				33	href="python.html">a variety of language bindings</a> make it available in
				34	other environments.</p>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	35
Daniel Veillard	710823b	2003-03-04 10:05:52 +0000	[diff] [blame]	36	<p>Libxml2 is known to be very portable, the library should build and work
				37	without serious troubles on a variety of systems (Linux, Unix, Windows,
				38	CygWin, MacOS, MacOS X, RISC Os, OS/2, VMS, QNX, MVS, ...)</p>
				39
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	40	<p>Libxml2 implements a number of existing standards related to markup
				41	languages:</p>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	42	<ul>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	43	<li>the XML standard: <a
				44	href="http://www.w3.org/TR/REC-xml">http://www.w3.org/TR/REC-xml</a></li>
				45	<li>Namespaces in XML: <a
				46	href="http://www.w3.org/TR/REC-xml-names/">http://www.w3.org/TR/REC-xml-names/</a></li>
				47	<li>XML Base: <a
				48	href="http://www.w3.org/TR/xmlbase/">http://www.w3.org/TR/xmlbase/</a></li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	49	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc2396.txt">RFC 2396</a> :
				50	Uniform Resource Identifiers <a
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	51	href="http://www.ietf.org/rfc/rfc2396.txt">http://www.ietf.org/rfc/rfc2396.txt</a></li>
				52	<li>XML Path Language (XPath) 1.0: <a
				53	href="http://www.w3.org/TR/xpath">http://www.w3.org/TR/xpath</a></li>
				54	<li>HTML4 parser: <a
				55	href="http://www.w3.org/TR/html401/">http://www.w3.org/TR/html401/</a></li>
Daniel Veillard	23a52c5	2003-08-18 10:01:18 +0000	[diff] [blame]	56	<li>XML Pointer Language (XPointer) Version 1.0: <a
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	57	href="http://www.w3.org/TR/xptr">http://www.w3.org/TR/xptr</a></li>
				58	<li>XML Inclusions (XInclude) Version 1.0: <a
				59	href="http://www.w3.org/TR/xinclude/">http://www.w3.org/TR/xinclude/</a></li>
Daniel Veillard	23a52c5	2003-08-18 10:01:18 +0000	[diff] [blame]	60	<li>ISO-8859-x encodings, as well as <a
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	61	href="http://www.cis.ohio-state.edu/rfc/rfc2044.txt">rfc2044</a> [UTF-8]
				62	and <a href="http://www.cis.ohio-state.edu/rfc/rfc2781.txt">rfc2781</a>
Daniel Veillard	23a52c5	2003-08-18 10:01:18 +0000	[diff] [blame]	63	[UTF-16] Unicode encodings, and more if using iconv support</li>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	64	<li>part of SGML Open Technical Resolution TR9401:1997</li>
				65	<li>XML Catalogs Working Draft 06 August 2001: <a
				66	href="http://www.oasis-open.org/committees/entity/spec-2001-08-06.html">http://www.oasis-open.org/committees/entity/spec-2001-08-06.html</a></li>
Daniel Veillard	5c39654	2002-03-15 07:57:50 +0000	[diff] [blame]	67	<li>Canonical XML Version 1.0: <a
				68	href="http://www.w3.org/TR/xml-c14n">http://www.w3.org/TR/xml-c14n</a>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	69	and the Exclusive XML Canonicalization CR draft <a
				70	href="http://www.w3.org/TR/xml-exc-c14n">http://www.w3.org/TR/xml-exc-c14n</a></li>
Daniel Veillard	758c531	2003-12-15 11:51:25 +0000	[diff] [blame]	71	<li>Relax NG, ISO/IEC 19757-2:2003, <a
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	72	href="http://www.oasis-open.org/committees/relax-ng/spec-20011203.html">http://www.oasis-open.org/committees/relax-ng/spec-20011203.html</a></li>
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	73	<li>W3C XML Schemas Part 2: Datatypes <a
				74	href="http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/">REC 02 May
Daniel Veillard	7ecced5	2003-12-18 14:22:09 +0000	[diff] [blame]	75	2001</a></li>
Daniel Veillard	eca726d	2004-04-18 21:47:34 +0000	[diff] [blame]	76	<li>W3C <a href="http://www.w3.org/TR/xml-id/">xml:id</a> Working Draft 7
				77	April 2004</li>
Daniel Veillard	9698445	2000-08-31 13:50:12 +0000	[diff] [blame]	78	</ul>
				79
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	80	<p>In most cases libxml2 tries to implement the specifications in a
Daniel Veillard	7c4eb63	2004-04-19 21:29:12 +0000	[diff] [blame]	81	relatively strictly compliant way. As of release 2.4.16, libxml2 passed all
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	82	1800+ tests from the <a
Daniel Veillard	a539356	2002-02-20 11:40:49 +0000	[diff] [blame]	83	href="http://www.oasis-open.org/committees/xml-conformance/">OASIS XML Tests
				84	Suite</a>.</p>
Daniel Veillard	5b16f58	2002-02-20 11:38:46 +0000	[diff] [blame]	85
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	86	<p>To some extent libxml2 provides support for the following additional
				87	specifications but doesn't claim to implement them completely:</p>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	88	<ul>
				89	<li>Document Object Model (DOM) <a
				90	href="http://www.w3.org/TR/DOM-Level-2-Core/">http://www.w3.org/TR/DOM-Level-2-Core/</a>
Daniel Veillard	d4cfcef	2004-05-06 18:55:27 +0000	[diff] [blame]	91	the document model, but it doesn't implement the API itself, gdome2 does
				92	this on top of libxml2</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	93	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc959.txt">RFC 959</a> :
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	94	libxml2 implements a basic FTP client code</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	95	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc1945.txt">RFC 1945</a> :
				96	HTTP/1.0, again a basic HTTP client code</li>
Daniel Veillard	7c4eb63	2004-04-19 21:29:12 +0000	[diff] [blame]	97	<li>SAX: a SAX2 like interface and a minimal SAX1 implementation compatible
				98	with early expat versions</li>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	99	</ul>
				100
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	101	<p>A partial implementation of <a
				102	href="http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/">XML Schemas Part
				103	1: Structure</a> is being worked on but it would be far too early to make any
				104	conformance statement about it at the moment.</p>
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	105
Daniel Veillard	9698445	2000-08-31 13:50:12 +0000	[diff] [blame]	106	<p>Separate documents:</p>
				107	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	108	<li><a href="http://xmlsoft.org/XSLT/">the libxslt page</a> providing an
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	109	implementation of XSLT 1.0 and common extensions like EXSLT for
				110	libxml2</li>
Daniel Veillard	c6271d2	2001-10-27 07:50:58 +0000	[diff] [blame]	111	<li><a href="http://www.cs.unibo.it/~casarini/gdome2/">the gdome2 page</a>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	112	: a standard DOM2 implementation for libxml2</li>
				113	<li><a href="http://www.aleksey.com/xmlsec/">the XMLSec page</a>: an
				114	implementation of <a href="http://www.w3.org/TR/xmldsig-core/">W3C XML
				115	Digital Signature</a> for libxml2</li>
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	116	<li>also check the related links section below for more related and active
				117	projects.</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	118	</ul>
Daniel Veillard	252004d	2004-03-23 12:32:32 +0000	[diff] [blame]	119	<!----------------<p>Results of the <a
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	120	href="http://xmlbench.sourceforge.net/results/benchmark/index.html">xmlbench
Daniel Veillard	31ae462	2004-02-16 07:45:44 +0000	[diff] [blame]	121	benchmark</a> on sourceforge February 2004 (smaller is better):</p>
Daniel Veillard	d8da01c	2003-03-24 15:58:23 +0000	[diff] [blame]	122
Daniel Veillard	31ae462	2004-02-16 07:45:44 +0000	[diff] [blame]	123	<p align="center"><img src="benchmark.png"
Daniel Veillard	d8da01c	2003-03-24 15:58:23 +0000	[diff] [blame]	124	alt="benchmark results for Expat Xerces libxml2 Oracle and Sun toolkits"></p>
Daniel Veillard	cf80b78	2004-03-07 19:32:19 +0000	[diff] [blame]	125	-------------->
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	126
Daniel Veillard	252004d	2004-03-23 12:32:32 +0000	[diff] [blame]	127
Daniel Veillard	e166254	2002-08-28 11:50:59 +0000	[diff] [blame]	128	<p>Logo designed by <a href="mailto:liyanage@access.ch">Marc Liyanage</a>.</p>
				129
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	130	<h2><a name="Introducti">Introduction</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	131
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	132	<p>This document describes libxml, the <a
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	133	href="http://www.w3.org/XML/">XML</a> C parser and toolkit developed for the
				134	<a href="http://www.gnome.org/">Gnome</a> project. <a
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	135	href="http://www.w3.org/XML/">XML is a standard</a> for building tag-based
				136	structured documents/data.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	137
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	138	<p>Here are some key points about libxml:</p>
				139	<ul>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	140	<li>Libxml2 exports Push (progressive) and Pull (blocking) type parser
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	141	interfaces for both XML and HTML.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	142	<li>Libxml2 can do DTD validation at parse time, using a parsed document
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	143	instance, or with an arbitrary DTD.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	144	<li>Libxml2 includes complete <a
Daniel Veillard	8c2ecaf	2001-07-10 17:53:07 +0000	[diff] [blame]	145	href="http://www.w3.org/TR/xpath">XPath</a>, <a
				146	href="http://www.w3.org/TR/xptr">XPointer</a> and <a
				147	href="http://www.w3.org/TR/xinclude">XInclude</a> implementations.</li>
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	148	<li>It is written in plain C, making as few assumptions as possible, and
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	149	sticking closely to ANSI C/POSIX for easy embedding. Works on
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	150	Linux/Unix/Windows, ported to a number of other platforms.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	151	<li>Basic support for HTTP and FTP client allowing applications to fetch
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	152	remote resources.</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	153	<li>The design is modular, most of the extensions can be compiled out.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	154	<li>The internal document representation is as close as possible to the <a
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	155	href="http://www.w3.org/DOM/">DOM</a> interfaces.</li>
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	156	<li>Libxml2 also has a <a
				157	href="http://www.megginson.com/SAX/index.html">SAX like interface</a>;
				158	the interface is designed to be compatible with <a
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	159	href="http://www.jclark.com/xml/expat.html">Expat</a>.</li>
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	160	<li>This library is released under the <a
				161	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	162	License</a>. See the Copyright file in the distribution for the precise
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	163	wording.</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	164	</ul>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	165
Daniel Veillard	e0c1d72	2001-03-21 10:28:36 +0000	[diff] [blame]	166	<p>Warning: unless you are forced to because your application links with a
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	167	Gnome-1.X library requiring it, <strong><span
Daniel Veillard	e0c1d72	2001-03-21 10:28:36 +0000	[diff] [blame]	168	style="background-color: #FF0000">Do Not Use libxml1</span></strong>, use
				169	libxml2</p>
				170
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	171	<h2><a name="FAQ">FAQ</a></h2>
				172
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	173	<p>Table of Contents:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	174	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	175	<li><a href="FAQ.html#License">License(s)</a></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	176	<li><a href="FAQ.html#Installati">Installation</a></li>
				177	<li><a href="FAQ.html#Compilatio">Compilation</a></li>
				178	<li><a href="FAQ.html#Developer">Developer corner</a></li>
				179	</ul>
				180
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	181	<h3><a name="License">License</a>(s)</h3>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	182	<ol>
				183	<li><em>Licensing Terms for libxml</em>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	184	<p>libxml2 is released under the <a
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	185	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	186	License</a>; see the file Copyright in the distribution for the precise
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	187	wording</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	188	</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	189	<li><em>Can I embed libxml2 in a proprietary application ?</em>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	190	<p>Yes. The MIT License allows you to keep proprietary the changes you
				191	made to libxml, but it would be graceful to send-back bug fixes and
				192	improvements as patches for possible incorporation in the main
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	193	development tree.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	194	</li>
				195	</ol>
				196
				197	<h3><a name="Installati">Installation</a></h3>
				198	<ol>
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	199	<li><strong><span style="background-color: #FF0000">Do Not Use
				200	libxml1</span></strong>, use libxml2</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	201	<li><em>Where can I get libxml</em> ?
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	202	<p>The original distribution comes from <a
				203	href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> or <a
Daniel Veillard	024f199	2003-12-10 16:43:49 +0000	[diff] [blame]	204	href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.6/">gnome.org</a></p>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	205	<p>Most Linux and BSD distributions include libxml, this is probably the
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	206	safer way for end-users to use libxml.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	207	<p>David Doolin provides precompiled Windows versions at <a
				208	href="http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/ ">http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/</a></p>
				209	</li>
				210	<li><em>I see libxml and libxml2 releases, which one should I install ?</em>
				211	<ul>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	212	<li>If you are not constrained by backward compatibility issues with
				213	existing applications, install libxml2 only</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	214	<li>If you are not doing development, you can safely install both.
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	215	Usually the packages <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	216	href="http://rpmfind.net/linux/RPM/libxml.html">libxml</a> and <a
				217	href="http://rpmfind.net/linux/RPM/libxml2.html">libxml2</a> are
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	218	compatible (this is not the case for development packages).</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	219	<li>If you are a developer and your system provides separate packaging
				220	for shared libraries and the development components, it is possible
				221	to install libxml and libxml2, and also <a
				222	href="http://rpmfind.net/linux/RPM/libxml-devel.html">libxml-devel</a>
				223	and <a
				224	href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml2-devel</a>
				225	too for libxml2 >= 2.3.0</li>
				226	<li>If you are developing a new application, please develop against
				227	libxml2(-devel)</li>
				228	</ul>
				229	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	230	<li><em>I can't install the libxml package, it conflicts with libxml0</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	231	<p>You probably have an old libxml0 package used to provide the shared
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	232	library for libxml.so.0, you can probably safely remove it. The libxml
				233	packages provided on <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	234	href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> provide
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	235	libxml.so.0</p>
				236	</li>
				237	<li><em>I can't install the libxml(2) RPM package due to failed
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	238	dependencies</em>
				239	<p>The most generic solution is to re-fetch the latest src.rpm , and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	240	rebuild it locally with</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	241	<p><code>rpm --rebuild libxml(2)-xxx.src.rpm</code>.</p>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	242	<p>If everything goes well it will generate two binary rpm packages (one
				243	providing the shared libs and xmllint, and the other one, the -devel
				244	package, providing includes, static libraries and scripts needed to build
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	245	applications with libxml(2)) that you can install locally.</p>
				246	</li>
				247	</ol>
				248
				249	<h3><a name="Compilatio">Compilation</a></h3>
				250	<ol>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	251	<li><em>What is the process to compile libxml2 ?</em>
				252	<p>As most UNIX libraries libxml2 follows the "standard":</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	253	<p><code>gunzip -c xxx.tar.gz \| tar xvf -</code></p>
				254	<p><code>cd libxml-xxxx</code></p>
				255	<p><code>./configure --help</code></p>
				256	<p>to see the options, then the compilation/installation proper</p>
				257	<p><code>./configure [possible options]</code></p>
				258	<p><code>make</code></p>
				259	<p><code>make install</code></p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	260	<p>At that point you may have to rerun ldconfig or a similar utility to
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	261	update your list of installed shared libs.</p>
				262	</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	263	<li><em>What other libraries are needed to compile/install libxml2 ?</em>
				264	<p>Libxml2 does not require any other library, the normal C ANSI API
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	265	should be sufficient (please report any violation to this rule you may
				266	find).</p>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	267	<p>However if found at configuration time libxml2 will detect and use the
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	268	following libs:</p>
				269	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	270	<li><a href="http://www.info-zip.org/pub/infozip/zlib/">libz</a> : a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	271	highly portable and available widely compression library.</li>
				272	<li>iconv: a powerful character encoding conversion library. It is
				273	included by default in recent glibc libraries, so it doesn't need to
				274	be installed specifically on Linux. It now seems a <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	275	href="http://www.opennc.org/onlinepubs/7908799/xsh/iconv.html">part
				276	of the official UNIX</a> specification. Here is one <a
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	277	href="http://www.gnu.org/software/libiconv/">implementation of the
				278	library</a> which source can be found <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	279	href="ftp://ftp.ilog.fr/pub/Users/haible/gnu/">here</a>.</li>
				280	</ul>
				281	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	282	<li><em>Make check fails on some platforms</em>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	283	<p>Sometimes the regression tests' results don't completely match the
				284	value produced by the parser, and the makefile uses diff to print the
				285	delta. On some platforms the diff return breaks the compilation process;
				286	if the diff is small this is probably not a serious problem.</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	287	<p>Sometimes (especially on Solaris) make checks fail due to limitations
Daniel Veillard	e46182c	2002-02-12 14:29:11 +0000	[diff] [blame]	288	in make. Try using GNU-make instead.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	289	</li>
				290	<li><em>I use the CVS version and there is no configure script</em>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	291	<p>The configure script (and other Makefiles) are generated. Use the
				292	autogen.sh script to regenerate the configure script and Makefiles,
				293	like:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	294	<p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
				295	</li>
				296	<li><em>I have troubles when running make tests with gcc-3.0</em>
				297	<p>It seems the initial release of gcc-3.0 has a problem with the
				298	optimizer which miscompiles the URI module. Please use another
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	299	compiler.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	300	</li>
				301	</ol>
				302
				303	<h3><a name="Developer">Developer</a> corner</h3>
				304	<ol>
Daniel Veillard	93d9525	2003-04-29 20:25:40 +0000	[diff] [blame]	305	<li><em>Troubles compiling or linking programs using libxml2</em>
				306	<p>Usually the problem comes from the fact that the compiler doesn't get
				307	the right compilation or linking flags. There is a small shell script
				308	<code>xml2-config</code> which is installed as part of libxml2 usual
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	309	install process which provides those flags. Use</p>
Daniel Veillard	93d9525	2003-04-29 20:25:40 +0000	[diff] [blame]	310	<p><code>xml2-config --cflags</code></p>
				311	<p>to get the compilation flags and</p>
				312	<p><code>xml2-config --libs</code></p>
				313	<p>to get the linker flags. Usually this is done directly from the
				314	Makefile as:</p>
				315	<p><code>CFLAGS=`xml2-config --cflags`</code></p>
				316	<p><code>LIBS=`xml2-config --libs`</code></p>
				317	</li>
William M. Brack	99906ad	2005-01-09 17:02:42 +0000	[diff] [blame]	318	<li><em>I want to install my own copy of libxml2 in my home directory and link
				319	my programs against it, but it doesn't work</em>
				320	<p>There are many different ways to accomplish this. Here is one way to
				321	do this under Linux. Suppose your home directory is <code>/home/user.
				322	</code>Then:</p>
				323	<ul><li>Create a subdirectory, let's call it <code>myxml</code></li>
				324	<li>unpack the libxml2 distribution into that subdirectory</li>
				325	<li>chdir into the unpacked distribution (<code>/home/user/myxml/libxml2
				326	</code>)</li>
				327	<li>configure the library using the "<code>--prefix</code>" switch,
				328	specifying an installation subdirectory in <code>/home/user/myxml</code>,
				329	e.g.
				330	<p><code>./configure --prefix /home/user/myxml/xmlinst</code> {other
				331	configuration options}</p></li>
				332	<li>now run <code>make</code> followed by <code>make install</code></li>
				333	<li>At this point, the installation subdirectory contains the complete
				334	"private" include files, library files and binary program files (e.g.
				335	xmllint), located in
				336	<p> <code>/home/user/myxml/xmlinst/lib, /home/user/myxml/xmlinst/include
				337	</code> and <code> /home/user/myxml/xmlinst/bin</code></p>
				338	respectively.</li>
				339	<li>In order to use this "private" library, you should first add it
				340	to the beginning of your default PATH (so that your own private
				341	program files such as xmllint will be used instead of the normal
				342	system ones). To do this, the Bash command would be
				343	<p><code>export PATH=/home/user/myxml/xmlinst/bin:$PATH</code></p></li>
				344	<li>Now suppose you have a program <code>test1.c</code> that you would
				345	like to compile with your "private" library. Simply compile it
				346	using the command <p><code>gcc `xml2-config --cflags --libs` -o test
				347	test.c</code></p> Note that, because your PATH has been set with <code>
				348	/home/user/myxml/xmlinst/bin</code> at the beginning, the
				349	xml2-config program which you just installed will be used instead of
				350	the system default one, and this will <em>automatically</em> get the
				351	correct libraries linked with your program.</li></ul>
				352	</li><p/>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	353	<li><em>xmlDocDump() generates output on one line.</em>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	354	<p>Libxml2 will not <strong>invent</strong> spaces in the content of a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	355	document since <strong>all spaces in the content of a document are
				356	significant</strong>. If you build a tree from the API and want
				357	indentation:</p>
				358	<ol>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	359	<li>the correct way is to generate those yourself too.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	360	<li>the dangerous way is to ask libxml2 to add those blanks to your
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	361	content <strong>modifying the content of your document in the
				362	process</strong>. The result may not be what you expect. There is
				363	<strong>NO</strong> way to guarantee that such a modification won't
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	364	affect other parts of the content of your document. See <a
Daniel Veillard	5373ea1	2003-07-24 13:09:13 +0000	[diff] [blame]	365	href="http://xmlsoft.org/html/libxml-parser.html#xmlKeepBlanksDefault">xmlKeepBlanksDefault
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	366	()</a> and <a
Daniel Veillard	5373ea1	2003-07-24 13:09:13 +0000	[diff] [blame]	367	href="http://xmlsoft.org/html/libxml-tree.html#xmlSaveFormatFile">xmlSaveFormatFile
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	368	()</a></li>
				369	</ol>
				370	</li>
				371	<li>Extra nodes in the document:
				372	<p><em>For a XML file as below:</em></p>
				373	<pre><?xml version="1.0"?>
				374	<PLAN xmlns="http://www.argus.ca/autotest/1.0/">
				375	<NODE CommFlag="0"/>
				376	<NODE CommFlag="1"/>
				377	</PLAN></pre>
				378	<p><em>after parsing it with the function
				379	pxmlDoc=xmlParseFile(...);</em></p>
				380	<p><em>I want to the get the content of the first node (node with the
				381	CommFlag="0")</em></p>
				382	<p><em>so I did it as following;</em></p>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	383	<pre>xmlNodePtr pnode;
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	384	pnode=pxmlDoc->children->children;</pre>
				385	<p><em>but it does not work. If I change it to</em></p>
				386	<pre>pnode=pxmlDoc->children->children->next;</pre>
				387	<p><em>then it works. Can someone explain it to me.</em></p>
				388	<p></p>
				389	<p>In XML all characters in the content of the document are significant
				390	<strong>including blanks and formatting line breaks</strong>.</p>
				391	<p>The extra nodes you are wondering about are just that, text nodes with
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	392	the formatting spaces which are part of the document but that people tend
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	393	to forget. There is a function <a
				394	href="http://xmlsoft.org/html/libxml-parser.html">xmlKeepBlanksDefault
				395	()</a> to remove those at parse time, but that's an heuristic, and its
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	396	use should be limited to cases where you are certain there is no
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	397	mixed-content in the document.</p>
				398	</li>
				399	<li><em>I get compilation errors of existing code like when accessing
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	400	<strong>root</strong> or <strong>child fields</strong> of nodes.</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	401	<p>You are compiling code developed for libxml version 1 and using a
				402	libxml2 development environment. Either switch back to libxml v1 devel or
				403	even better fix the code to compile with libxml2 (or both) by <a
				404	href="upgrade.html">following the instructions</a>.</p>
				405	</li>
				406	<li><em>I get compilation errors about non existing
				407	<strong>xmlRootNode</strong> or <strong>xmlChildrenNode</strong>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	408	fields.</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	409	<p>The source code you are using has been <a
				410	href="upgrade.html">upgraded</a> to be able to compile with both libxml
				411	and libxml2, but you need to install a more recent version:
				412	libxml(-devel) >= 1.8.8 or libxml2(-devel) >= 2.1.0</p>
				413	</li>
				414	<li><em>XPath implementation looks seriously broken</em>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	415	<p>XPath implementation prior to 2.3.0 was really incomplete. Upgrade to
				416	a recent version, there are no known bugs in the current version.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	417	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	418	<li><em>The example provided in the web page does not compile.</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	419	<p>It's hard to maintain the documentation in sync with the code
				420	<grin/> ...</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	421	<p>Check the previous points 1/ and 2/ raised before, and please send
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	422	patches.</p>
				423	</li>
Daniel Veillard	8d7b5c7	2003-11-15 18:24:36 +0000	[diff] [blame]	424	<li><em>Where can I get more examples and information than provided on the
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	425	web page?</em>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	426	<p>Ideally a libxml2 book would be nice. I have no such plan ... But you
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	427	can:</p>
				428	<ul>
				429	<li>check more deeply the <a href="html/libxml-lib.html">existing
				430	generated doc</a></li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	431	<li>have a look at <a href="examples/index.html">the set of
				432	examples</a>.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	433	<li>look for examples of use for libxml2 function using the Gnome code.
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	434	For example the following will query the full Gnome CVS base for the
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	435	use of the <strong>xmlAddChild()</strong> function:
				436	<p><a
				437	href="http://cvs.gnome.org/lxr/search?string=xmlAddChild">http://cvs.gnome.org/lxr/search?string=xmlAddChild</a></p>
				438	<p>This may be slow, a large hardware donation to the gnome project
				439	could cure this :-)</p>
				440	</li>
				441	<li><a
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	442	href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&dir=gnome-xml">Browse
				443	the libxml2 source</a> , I try to write code as clean and documented
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	444	as possible, so looking at it may be helpful. In particular the code
				445	of xmllint.c and of the various testXXX.c test programs should
				446	provide good examples of how to do things with the library.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	447	</ul>
				448	</li>
				449	<li>What about C++ ?
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	450	<p>libxml2 is written in pure C in order to allow easy reuse on a number
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	451	of platforms, including embedded systems. I don't intend to convert to
				452	C++.</p>
Daniel Veillard	91e69c5	2003-08-04 01:43:07 +0000	[diff] [blame]	453	<p>There is however a C++ wrapper which may fulfill your needs:</p>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	454	<ul>
				455	<li>by Ari Johnson <ari@btigate.com>:
				456	<p>Website: <a
Daniel Veillard	91e69c5	2003-08-04 01:43:07 +0000	[diff] [blame]	457	href="http://libxmlplusplus.sourceforge.net/">http://libxmlplusplus.sourceforge.net/</a></p>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	458	<p>Download: <a
Daniel Veillard	91e69c5	2003-08-04 01:43:07 +0000	[diff] [blame]	459	href="http://sourceforge.net/project/showfiles.php?group_id=12999">http://sourceforge.net/project/showfiles.php?group_id=12999</a></p>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	460	</li>
Daniel Veillard	83ee40d	2003-08-09 22:24:09 +0000	[diff] [blame]	461	<!-- Website is currently unavailable as of 2003-08-02
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	462	<li>by Peter Jones <pjones@pmade.org>
Daniel Veillard	83ee40d	2003-08-09 22:24:09 +0000	[diff] [blame]	463	<p>Website: <a
				464	href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	465	</li>
Daniel Veillard	83ee40d	2003-08-09 22:24:09 +0000	[diff] [blame]	466	-->
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	467	</ul>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	468	</li>
				469	<li>How to validate a document a posteriori ?
				470	<p>It is possible to validate documents which had not been validated at
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	471	initial parsing time or documents which have been built from scratch
				472	using the API. Use the <a
Daniel Veillard	5373ea1	2003-07-24 13:09:13 +0000	[diff] [blame]	473	href="http://xmlsoft.org/html/libxml-valid.html#xmlValidateDtd">xmlValidateDtd()</a>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	474	function. It is also possible to simply add a DTD to an existing
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	475	document:</p>
				476	<pre>xmlDocPtr doc; /* your existing document */
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	477	xmlDtdPtr dtd = xmlParseDTD(NULL, filename_of_dtd); /* parse the DTD */
				478
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	479	dtd->name = xmlStrDup((xmlChar)"root_name"); / use the given root */
				480
				481	doc->intSubset = dtd;
				482	if (doc->children == NULL) xmlAddChild((xmlNodePtr)doc, (xmlNodePtr)dtd);
				483	else xmlAddPrevSibling(doc->children, (xmlNodePtr)dtd);
				484	</pre>
				485	</li>
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	486	<li>So what is this funky "xmlChar" used all the time?
				487	<p>It is a null terminated sequence of utf-8 characters. And only utf-8!
				488	You need to convert strings encoded in different ways to utf-8 before
				489	passing them to the API. This can be accomplished with the iconv library
				490	for instance.</p>
John Fleck	61f6fb6	2002-10-31 15:23:29 +0000	[diff] [blame]	491	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	492	<li>etc ...</li>
				493	</ol>
				494
				495	<p></p>
				496
Daniel Veillard	66f68e7	2003-08-18 16:39:51 +0000	[diff] [blame]	497	<h2><a name="Documentat">Developer Menu</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	498
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	499	<p>There are several on-line resources related to using libxml:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	500	<ol>
MST 2003 John Fleck	2b7142a	2003-11-22 03:55:27 +0000	[diff] [blame]	501	<li>Use the <a href="search.php">search engine</a> to look up
				502	information.</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	503	<li>Check the <a href="FAQ.html">FAQ.</a></li>
Daniel Veillard	c19fccc	2000-07-03 11:52:01 +0000	[diff] [blame]	504	<li>Check the <a href="http://xmlsoft.org/html/libxml-lib.html">extensive
MST 2003 John Fleck	2b7142a	2003-11-22 03:55:27 +0000	[diff] [blame]	505	documentation</a> automatically extracted from code comments.</li>
Daniel Veillard	8d86964	2000-07-14 12:12:59 +0000	[diff] [blame]	506	<li>Look at the documentation about <a href="encoding.html">libxml
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	507	internationalization support</a>.</li>
Daniel Veillard	bc66f85	2002-01-14 09:49:20 +0000	[diff] [blame]	508	<li>This page provides a global overview and <a href="example.html">some
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	509	examples</a> on how to use libxml.</li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	510	<li><a href="examples/index.html">Code examples</a></li>
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	511	<li>John Fleck's libxml2 tutorial: <a href="tutorial/index.html">html</a>
				512	or <a href="tutorial/xmltutorial.pdf">pdf</a>.</li>
Daniel Veillard	1177ca4	2003-04-26 22:29:54 +0000	[diff] [blame]	513	<li>If you need to parse large files, check the <a
				514	href="xmlreader.html">xmlReader</a> API tutorial</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	515	<li><a href="mailto:james@daa.com.au">James Henstridge</a> wrote <a
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	516	href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">some nice
				517	documentation</a> explaining how to use the libxml SAX interface.</li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	518	<li>George Lebl wrote <a
MST 2003 John Fleck	2b7142a	2003-11-22 03:55:27 +0000	[diff] [blame]	519	href="http://www-106.ibm.com/developerworks/library/l-gnome3/">an article
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	520	for IBM developerWorks</a> about using libxml.</li>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	521	<li>Check <a href="http://cvs.gnome.org/lxr/source/gnome-xml/TODO">the TODO
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	522	file</a>.</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	523	<li>Read the <a href="upgrade.html">1.x to 2.x upgrade path</a>
				524	description. If you are starting a new project using libxml you should
				525	really use the 2.x version.</li>
Daniel Veillard	845cce4	2002-01-09 11:51:37 +0000	[diff] [blame]	526	<li>And don't forget to look at the <a
				527	href="http://mail.gnome.org/archives/xml/">mailing-list archive</a>.</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	528	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	529
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	530	<h2><a name="Reporting">Reporting bugs and getting help</a></h2>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	531
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	532	<p>Well, bugs or missing features are always possible, and I will make a
				533	point of fixing them in a timely fashion. The best way to report a bug is to
Daniel Veillard	ccf996f	2003-08-14 10:48:38 +0000	[diff] [blame]	534	use the <a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">Gnome
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	535	bug tracking database</a> (make sure to use the "libxml2" module name). I
				536	look at reports there regularly and it's good to have a reminder when a bug
				537	is still open. Be sure to specify that the bug is for the package libxml2.</p>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	538
Daniel Veillard	4ac494b	2003-09-18 15:08:00 +0000	[diff] [blame]	539	<p>For small problems you can try to get help on IRC, the #xml channel on
				540	irc.gnome.org (port 6667) usually have a few person subscribed which may help
				541	(but there is no garantee and if a real issue is raised it should go on the
				542	mailing-list for archival).</p>
Daniel Veillard	9582d6c	2003-09-16 11:40:04 +0000	[diff] [blame]	543
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	544	<p>There is also a mailing-list <a
Daniel Veillard	3197f16	2001-04-04 00:40:08 +0000	[diff] [blame]	545	href="mailto:xml@gnome.org">xml@gnome.org</a> for libxml, with an <a
				546	href="http://mail.gnome.org/archives/xml/">on-line archive</a> (<a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	547	href="http://xmlsoft.org/messages">old</a>). To subscribe to this list,
				548	please visit the <a
				549	href="http://mail.gnome.org/mailman/listinfo/xml">associated Web</a> page and
				550	follow the instructions. <strong>Do not send code, I won't debug it</strong>
				551	(but patches are really appreciated!).</p>
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	552
				553	<p>Please note that with the current amount of virus and SPAM, sending mail
				554	to the list without being subscribed won't work. There is *far too many
				555	bounces* (in the order of a thousand a day !) I cannot approve them manually
				556	anymore. If your mail to the list bounced waiting for administrator approval,
				557	it is LOST ! Repost it and fix the problem triggering the error.</p>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	558
Daniel Veillard	008186f	2001-09-13 14:24:44 +0000	[diff] [blame]	559	<p>Check the following <strong><span style="color: #FF0000">before
				560	posting</span></strong>:</p>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	561	<ul>
Daniel Veillard	321be0c	2002-10-08 21:26:42 +0000	[diff] [blame]	562	<li>Read the <a href="FAQ.html">FAQ</a> and <a href="search.php">use the
Daniel Veillard	a37aab8	2003-06-09 09:10:36 +0000	[diff] [blame]	563	search engine</a> to get information related to your problem.</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	564	<li>Make sure you are <a href="ftp://xmlsoft.org/">using a recent
				565	version</a>, and that the problem still shows up in a recent version.</li>
				566	<li>Check the <a href="http://mail.gnome.org/archives/xml/">list
				567	archives</a> to see if the problem was reported already. In this case
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	568	there is probably a fix available, similarly check the <a
Daniel Veillard	ccf996f	2003-08-14 10:48:38 +0000	[diff] [blame]	569	href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">registered
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	570	open bugs</a>.</li>
				571	<li>Make sure you can reproduce the bug with xmllint or one of the test
				572	programs found in source in the distribution.</li>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	573	<li>Please send the command showing the error as well as the input (as an
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	574	attachment)</li>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	575	</ul>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	576
Daniel Veillard	a37aab8	2003-06-09 09:10:36 +0000	[diff] [blame]	577	<p>Then send the bug with associated information to reproduce it to the <a
Daniel Veillard	33a6780	2001-03-07 09:44:02 +0000	[diff] [blame]	578	href="mailto:xml@gnome.org">xml@gnome.org</a> list; if it's really libxml
Daniel Veillard	98d071d	2003-01-10 09:22:44 +0000	[diff] [blame]	579	related I will approve it. Please do not send mail to me directly, it makes
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	580	things really hard to track and in some cases I am not the best person to
Daniel Veillard	98d071d	2003-01-10 09:22:44 +0000	[diff] [blame]	581	answer a given question, ask on the list.</p>
				582
				583	<p>To <span style="color: #E50000">be really clear about support</span>:</p>
				584	<ul>
Daniel Veillard	a37aab8	2003-06-09 09:10:36 +0000	[diff] [blame]	585	<li>Support or help <span style="color: #E50000">requests MUST be sent to
Daniel Veillard	98d071d	2003-01-10 09:22:44 +0000	[diff] [blame]	586	the list or on bugzilla</span> in case of problems, so that the Question
				587	and Answers can be shared publicly. Failing to do so carries the implicit
				588	message "I want free support but I don't want to share the benefits with
Daniel Veillard	831e8fd	2003-01-25 11:45:34 +0000	[diff] [blame]	589	others" and is not welcome. I will automatically Carbon-Copy the
				590	xml@gnome.org mailing list for any technical reply made about libxml2 or
				591	libxslt.</li>
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	592	<li>There is <span style="color: #E50000">no garantee of support</span>, if
				593	your question remains unanswered after a week, repost it, making sure you
				594	gave all the detail needed and the information requested.</li>
Daniel Veillard	a37aab8	2003-06-09 09:10:36 +0000	[diff] [blame]	595	<li>Failing to provide information as requested or double checking first
Daniel Veillard	98d071d	2003-01-10 09:22:44 +0000	[diff] [blame]	596	for prior feedback also carries the implicit message "the time of the
				597	library maintainers is less valuable than my time" and might not be
				598	welcome.</li>
				599	</ul>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	600
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	601	<p>Of course, bugs reported with a suggested patch for fixing them will
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	602	probably be processed faster than those without.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	603
				604	<p>If you're looking for help, a quick look at <a
Daniel Veillard	f7ed336	2001-08-17 12:01:21 +0000	[diff] [blame]	605	href="http://mail.gnome.org/archives/xml/">the list archive</a> may actually
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	606	provide the answer. I usually send source samples when answering libxml2
				607	usage questions. The <a
				608	href="http://xmlsoft.org/html/book1.html">auto-generated documentation</a> is
				609	not as polished as I would like (i need to learn more about DocBook), but
				610	it's a good starting point.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	611
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	612	<h2><a name="help">How to help</a></h2>
				613
				614	<p>You can help the project in various ways, the best thing to do first is to
				615	subscribe to the mailing-list as explained before, check the <a
Daniel Veillard	f7ed336	2001-08-17 12:01:21 +0000	[diff] [blame]	616	href="http://mail.gnome.org/archives/xml/">archives </a>and the <a
Daniel Veillard	ccf996f	2003-08-14 10:48:38 +0000	[diff] [blame]	617	href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">Gnome bug
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	618	database</a>:</p>
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	619	<ol>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	620	<li>Provide patches when you find problems.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	621	<li>Provide the diffs when you port libxml2 to a new platform. They may not
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	622	be integrated in all cases but help pinpointing portability problems
				623	and</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	624	<li>Provide documentation fixes (either as patches to the code comments or
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	625	as HTML diffs).</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	626	<li>Provide new documentations pieces (translations, examples, etc
				627	...).</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	628	<li>Check the TODO file and try to close one of the items.</li>
				629	<li>Take one of the points raised in the archive or the bug database and
Daniel Veillard	e7ead2d	2001-08-22 23:44:09 +0000	[diff] [blame]	630	provide a fix. <a href="mailto:daniel@veillard.com">Get in touch with me
				631	</a>before to avoid synchronization problems and check that the suggested
				632	fix will fit in nicely :-)</li>
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	633	</ol>
				634
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	635	<h2><a name="Downloads">Downloads</a></h2>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	636
Daniel Veillard	688f669	2004-03-26 10:57:38 +0000	[diff] [blame]	637	<p>The latest versions of libxml2 can be found on the <a
Daniel Veillard	eca726d	2004-04-18 21:47:34 +0000	[diff] [blame]	638	href="ftp://xmlsoft.org/">xmlsoft.org</a> server ( <a
				639	href="http://xmlsoft.org/sources/">HTTP</a>, <a
				640	href="ftp://xmlsoft.org/">FTP</a> and rsync are available), there is also
Daniel Veillard	210818b	2004-09-29 15:50:37 +0000	[diff] [blame]	641	mirrors (<a href="ftp://ftp.planetmirror.com/pub/xmlsoft/">Australia</a>( <a
				642	href="http://xmlsoft.planetmirror.com/">Web</a>), <a
Daniel Veillard	20c8cf2	2001-06-26 22:47:36 +0000	[diff] [blame]	643	href="ftp://fr.rpmfind.net/pub/libxml/">France</a>) or on the <a
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	644	href="ftp://ftp.gnome.org/pub/GNOME/MIRRORS.html">Gnome FTP server</a> as <a
				645	href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.6/">source archive</a>
Daniel Veillard	688f669	2004-03-26 10:57:38 +0000	[diff] [blame]	646	, Antonin Sprinzl also provide <a href="ftp://gd.tuwien.ac.at/pub/libxml/">a
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	647	mirror in Austria</a>. (NOTE that you need both the <a
Daniel Veillard	c19fccc	2000-07-03 11:52:01 +0000	[diff] [blame]	648	href="http://rpmfind.net/linux/RPM/libxml2.html">libxml(2)</a> and <a
				649	href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml(2)-devel</a>
Daniel Veillard	b46a573	2003-04-08 13:35:48 +0000	[diff] [blame]	650	packages installed to compile applications using libxml.)</p>
Daniel Veillard	eca726d	2004-04-18 21:47:34 +0000	[diff] [blame]	651
				652	<p>You can find all the history of libxml(2) and libxslt releases in the <a
Daniel Veillard	d4cfcef	2004-05-06 18:55:27 +0000	[diff] [blame]	653	href="http://xmlsoft.org/sources/old/">old</a> directory. The precompiled
Daniel Veillard	f81a8e8	2004-08-03 21:58:41 +0000	[diff] [blame]	654	Windows binaries made by Igor Zlatovic are available in the <a
				655	href="http://xmlsoft.org/sources/win32/">win32</a> directory.</p>
Daniel Veillard	b46a573	2003-04-08 13:35:48 +0000	[diff] [blame]	656
				657	<p>Binary ports:</p>
				658	<ul>
				659	<li>Red Hat RPMs for i386 are available directly on <a
				660	href="ftp://xmlsoft.org/">xmlsoft.org</a>, the source RPM will compile on
				661	any architecture supported by Red Hat.</li>
Daniel Veillard	b331fff	2004-08-22 14:21:57 +0000	[diff] [blame]	662	<li><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a> is now the
				663	maintainer of the Windows port, <a
Daniel Veillard	b46a573	2003-04-08 13:35:48 +0000	[diff] [blame]	664	href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
Daniel Veillard	b11f5b9	2004-08-03 22:09:36 +0000	[diff] [blame]	665	binaries</a>.</li>
MST 2004 John Fleck	b759b30	2004-12-21 15:14:08 +0000	[diff] [blame]	666	<li>Blastwave provides
				667	<a href="http://www.blastwave.org/packages.php/libxml2">Solaris binaries</a>.</li>
Daniel Veillard	d49370e	2005-04-11 23:28:16 +0000	[diff] [blame]	668	<li><a href="mailto:Steve.Ball@explain.com.au">Steve Ball</a> provides <a
				669	href="http://www.explain.com.au/oss/libxml2xslt.html">Mac Os X
Daniel Veillard	b46a573	2003-04-08 13:35:48 +0000	[diff] [blame]	670	binaries</a>.</li>
				671	<li>The HP-UX porting center provides <a
				672	href="http://hpux.connect.org.uk/hppd/hpux/Gnome/">HP-UX binaries</a></li>
				673	</ul>
				674
				675	<p>If you know other supported binary ports, please <a
				676	href="http://veillard.com/">contact me</a>.</p>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	677
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	678	<p><a name="Snapshot">Snapshot:</a></p>
				679	<ul>
Daniel Veillard	3cef119	2004-08-18 09:30:31 +0000	[diff] [blame]	680	<li>Code from the W3C cvs base libxml2 module, updated hourly <a
Daniel Veillard	fc263f1	2004-08-31 07:02:04 +0000	[diff] [blame]	681	href="ftp://xmlsoft.org/libxml2-cvs-snapshot.tar.gz">libxml2-cvs-snapshot.tar.gz</a>.</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	682	<li>Docs, content of the web site, the list archive included <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	683	href="ftp://xmlsoft.org/libxml-docs.tar.gz">libxml-docs.tar.gz</a>.</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	684	</ul>
				685
Daniel Veillard	c6271d2	2001-10-27 07:50:58 +0000	[diff] [blame]	686	<p><a name="Contribs">Contributions:</a></p>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	687
				688	<p>I do accept external contributions, especially if compiling on another
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	689	platform, get in touch with the list to upload the package, wrappers for
				690	various languages have been provided, and can be found in the <a
				691	href="python.html">bindings section</a></p>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	692
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	693	<p>Libxml2 is also available from CVS:</p>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	694	<ul>
Daniel Veillard	b331fff	2004-08-22 14:21:57 +0000	[diff] [blame]	695	<li><p>The <a href="http://cvs.gnome.org/viewcvs/libxml2/">Gnome CVS
				696	base</a>. Check the <a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	697	href="http://developer.gnome.org/tools/cvs.html">Gnome CVS Tools</a>
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	698	page; the CVS module is <b>libxml2</b>.</p>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	699	</li>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	700	<li>The <strong>libxslt</strong> module is also present there</li>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	701	</ul>
				702
Daniel Veillard	78fed53	2004-10-09 19:44:48 +0000	[diff] [blame]	703	<h2><a name="News">Releases</a></h2>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	704
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	705	<p>Items not finished and worked on, get in touch with the list if you want
Daniel Veillard	688f669	2004-03-26 10:57:38 +0000	[diff] [blame]	706	to help those</p>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	707	<ul>
Daniel Veillard	72fef16	2003-02-05 14:31:19 +0000	[diff] [blame]	708	<li>More testing on RelaxNG</li>
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	709	<li>Finishing up <a href="http://www.w3.org/TR/xmlschema-1/">XML
Daniel Veillard	72fef16	2003-02-05 14:31:19 +0000	[diff] [blame]	710	Schemas</a></li>
				711	</ul>
				712
Daniel Veillard	2d90803	2004-08-10 10:16:36 +0000	[diff] [blame]	713	<p>The <a href="ChangeLog.html">change log</a> describes the recents commits
				714	to the <a href="http://cvs.gnome.org/viewcvs/libxml2/">CVS</a> code base.</p>
				715
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	716	<p>There is the list of public releases:</p>
				717
Daniel Veillard	78dfc9f	2005-07-10 22:30:30 +0000	[diff] [blame]	718	<h3>2.6.20: Jul 10 2005</h3>
				719	<ul>
				720	<li> build fixes: Windows build (Rob Richards), Mingw compilation (Igor
				721	Zlatkovic), Windows Makefile (Igor), gcc warnings (Kasimier and
				722	andriy@google.com), use gcc weak references to pthread to avoid the
				723	pthread dependancy on Linux, compilation problem (Steve Nairn),
				724	compiling of subset (Morten Welinder), IPv6/ss_family compilation
				725	(William Brack), compilation when disabling parts of the library,
				726	standalone test distribution.
				727	</li>
				728	<li> bug fixes: bug in lang(), memory cleanup on errors (William Brack),
				729	HTTP query strings (Aron Stansvik), memory leak in DTD (William),
				730	integer overflow in XPath (William), nanoftp buffer size, pattern
				731	"." apth fixup (Kasimier), leak in tree reported by Malcolm Rowe,
				732	replaceNode patch (Brent Hendricks), CDATA with NULL content
				733	(Mark Vakoc), xml:base fixup on XInclude (William), pattern
				734	fixes (William), attribute bug in exclusive c14n (Aleksey Sanin),
				735	xml:space and xml:lang with SAX2 (Rob Richards), namespace
				736	trouble in complex parsing (Malcolm Rowe), XSD type QNames fixes
				737	(Kasimier), XPath streaming fixups (William), RelaxNG bug (Rob Richards),
				738	Schemas for Schemas fixes (Kasimier), removal of ID (Rob Richards),
				739	a small RelaxNG leak, HTML parsing in push mode bug (James Bursa),
				740	failure to detect UTF-8 parsing bugs in CDATA sections, areBlanks()
				741	heuristic failure, duplicate attributes in DTD bug (William).
				742	</li>
				743	<li> improvements: lot of work on Schemas by Kasimier Buchcik both on
				744	conformance and streaming, Schemas validation messages (Kasimier
				745	Buchcik, Matthew Burgess), namespace removal at the python level
				746	(Brent Hendricks), Update to new Schemas regression tests from
				747	W3C/Nist (Kasimier), xmlSchemaValidateFile() (Kasimier), implementation
				748	of xmlTextReaderReadInnerXml and xmlTextReaderReadOuterXml (James Wert),
				749	standalone test framework and programs, new DOM import APIs
				750	xmlDOMWrapReconcileNamespaces() xmlDOMWrapAdoptNode() and
				751	xmlDOMWrapRemoveNode(), extension of xmllint capabilities for
				752	SAX and Schemas regression tests, xmlStopParser() available in
				753	pull mode too, ienhancement to xmllint --shell namespaces support,
				754	Windows port of the standalone testing tools (Kasimier and William),
				755	xmlSchemaValidateStream() xmlSchemaSAXPlug() and xmlSchemaSAXUnplug()
				756	SAX Schemas APIs, Schemas xmlReader support.
				757	</li>
				758	</ul>
Daniel Veillard	771971f	2005-04-02 10:49:51 +0000	[diff] [blame]	759	<h3>2.6.19: Apr 02 2005</h3>
				760	<ul>
				761	<li> build fixes: drop .la from RPMs, --with-minimum build fix (William
				762	Brack), use XML_SOCKLEN_T instead of SOCKLEN_T because it breaks with
				763	AIX 5.3 compiler, fixed elfgcchack.h generation and PLT reduction
				764	code on Linux/ELF/gcc4</li>
				765	<li> bug fixes: schemas type decimal fixups (William Brack), xmmlint return
				766	code (Gerry Murphy), small schemas fixes (Matthew Burgess and
				767	GUY Fabrice), workaround "DAV:" namespace brokeness in c14n (Aleksey
				768	Sanin), segfault in Schemas (Kasimier Buchcik), Schemas attribute
				769	validation (Kasimier), Prop related functions and xmlNewNodeEatName
				770	(Rob Richards), HTML serialization of name attribute on a elements,
				771	Python error handlers leaks and improvement (Brent Hendricks),
				772	uninitialized variable in encoding code, Relax-NG validation bug,
				773	potential crash if gnorableWhitespace is NULL, xmlSAXParseDoc and
				774	xmlParseDoc signatures, switched back to assuming UTF-8 in case
				775	no encoding is given at serialization time</li>
Daniel Veillard	0dcc50a	2005-04-04 09:34:15 +0000	[diff] [blame]	776	<li> improvements: lot of work on Schemas by Kasimier Buchcik on facets
Daniel Veillard	771971f	2005-04-02 10:49:51 +0000	[diff] [blame]	777	checking and also mixed handling.</li>
				778	<li></li>
				779	</ul>
Daniel Veillard	57c000e	2005-03-13 18:34:29 +0000	[diff] [blame]	780	<h3>2.6.18: Mar 13 2005</h3>
				781	<ul>
				782	<li> build fixes: warnings (Peter Breitenlohner), testapi.c generation,
				783	Bakefile support (Francesco Montorsi), Windows compilation (Joel Reed),
				784	some gcc4 fixes, HP-UX portability fixes (Rick Jones).</li>
				785	<li> bug fixes: xmlSchemaElementDump namespace (Kasimier Buchcik), push and
				786	xmlreader stopping on non-fatal errors, thread support for dictionnaries
				787	reference counting (Gary Coady), internal subset and push problem,
				788	URL saved in xmlCopyDoc, various schemas bug fixes (Kasimier), Python
				789	paths fixup (Stephane Bidoul), xmlGetNodePath and namespaces,
				790	xmlSetNsProp fix (Mike Hommey), warning should not count as error
				791	(William Brack), xmlCreatePushParser empty chunk, XInclude parser
				792	flags (William), cleanup FTP and HTTP code to reuse the uri parsing
				793	and IPv6 (William), xmlTextWriterStartAttributeNS fix (Rob Richards),
				794	XMLLINT_INDENT being empty (William), xmlWriter bugs (Rob Richards),
				795	multithreading on Windows (Rich Salz), xmlSearchNsByHref fix (Kasimier),
				796	Python binding leak (Brent Hendricks), aliasing bug exposed by gcc4
				797	on s390, xmlTextReaderNext bug (Rob Richards), Schemas decimal type
				798	fixes (William Brack), xmlByteConsumed static buffer (Ben Maurer).</li>
				799	<li> improvement: speedup parsing comments and DTDs, dictionnary support for
				800	hash tables, Schemas Identity constraints (Kasimier), streaming XPath
				801	subset, xmlTextReaderReadString added (Bjorn Reese), Schemas canonical
				802	values handling (Kasimier), add xmlTextReaderByteConsumed (Aron
				803	Stansvik), </li>
				804	<li> Documentation: Wiki support (Joel Reed)
				805	</ul>
Daniel Veillard	298d964	2005-01-16 20:01:55 +0000	[diff] [blame]	806	<h3>2.6.17: Jan 16 2005</h3>
				807	<ul>
				808	<li>build fixes: Windows, warnings removal (William Brack),
				809	maintainer-clean dependency(William), build in a different directory
				810	(William), fixing --with-minimum configure build (William), BeOS
				811	build (Marcin Konicki), Python-2.4 detection (William), compilation
				812	on AIX (Dan McNichol)</li>
				813	<li>bug fixes: xmlTextReaderHasAttributes (Rob Richards), xmlCtxtReadFile()
				814	to use the catalog(s), loop on output (William Brack), XPath memory leak,
				815	ID deallocation problem (Steve Shepard), debugDumpNode crash (William),
				816	warning not using error callback (William), xmlStopParser bug (William),
				817	UTF-16 with BOM on DTDs (William), namespace bug on empty elements
				818	in push mode (Rob Richards), line and col computations fixups (Aleksey
				819	Sanin), xmlURIEscape fix (William), xmlXPathErr on bad range (William),
				820	patterns with too many steps, bug in RNG choice optimization, line
				821	number sometimes missing.
				822	</li>
				823	<li>improvements: XSD Schemas (Kasimier Buchcik), python generator (William),
				824	xmlUTF8Strpos speedup (William), unicode Python strings (William),
				825	XSD error reports (Kasimier Buchcik), Python __str__ call serialize().
				826	</li>
				827	<li>new APIs: added xmlDictExists(), GetLineNumber and GetColumnNumber
				828	for the xmlReader (Aleksey Sanin), Dynamic Shared Libraries APIs
				829	(mostly Joel Reed), error extraction API from regexps, new XMLSave
				830	option for format (Phil Shafer)</li>
				831	<li>documentation: site improvement (John Fleck), FAQ entries (William).</li>
				832	</ul>
				833
Daniel Veillard	c3d7cb4	2004-11-10 14:34:45 +0000	[diff] [blame]	834	<h3>2.6.16: Nov 10 2004</h3>
				835	<ul>
				836	<li>general hardening and bug fixing crossing all the API based on new
				837	automated regression testing</li>
				838	<li>build fix: IPv6 build and test on AIX (Dodji Seketeli)</li>
				839	<li>bug fixes: problem with XML::Libxml reported by Petr Pajas, encoding
				840	conversion functions return values, UTF-8 bug affecting XPath reported by
				841	Markus Bertheau, catalog problem with NULL entries (William Brack)</li>
				842	<li>documentation: fix to xmllint man page, some API function descritpion
				843	were updated.</li>
				844	<li>improvements: DTD validation APIs provided at the Python level (Brent
				845	Hendricks) </li>
				846	</ul>
				847
Daniel Veillard	c2f83d1	2004-10-27 22:59:21 +0000	[diff] [blame]	848	<h3>2.6.15: Oct 27 2004</h3>
Daniel Veillard	6927b10	2004-10-27 17:29:04 +0000	[diff] [blame]	849	<ul>
				850	<li>security fixes on the nanoftp and nanohttp modules</li>
				851	<li>build fixes: xmllint detection bug in configure, building outside the
				852	source tree (Thomas Fitzsimmons)</li>
				853	<li>bug fixes: HTML parser on broken ASCII chars in names (William), Python
				854	paths (Malcolm Tredinnick), xmlHasNsProp and default namespace (William),
				855	saving to python file objects (Malcolm Tredinnick), DTD lookup fix
				856	(Malcolm), save back <group> in catalogs (William), tree build
				857	fixes (DV and Rob Richards), Schemas memory bug, structured error handler
				858	on Python 64bits, thread local memory deallocation, memory leak reported
				859	by Volker Roth, xmlValidateDtd in the presence of an internal subset,
				860	entities and _private problem (William), xmlBuildRelativeURI error
				861	(William).</li>
				862	<li>improvements: better XInclude error reports (William), tree debugging
				863	module and tests, convenience functions at the Reader API (Graham
				864	Bennett), add support for PI in the HTML parser.</li>
				865	</ul>
				866
Daniel Veillard	210818b	2004-09-29 15:50:37 +0000	[diff] [blame]	867	<h3>2.6.14: Sep 29 2004</h3>
				868	<ul>
				869	<li>build fixes: configure paths for xmllint and xsltproc, compilation
				870	without HTML parser, compilation warning cleanups (William Brack &
Daniel Veillard	6927b10	2004-10-27 17:29:04 +0000	[diff] [blame]	871	Malcolm Tredinnick), VMS makefile update (Craig Berry),</li>
Daniel Veillard	210818b	2004-09-29 15:50:37 +0000	[diff] [blame]	872	<li>bug fixes: xmlGetUTF8Char (William Brack), QName properties (Kasimier
				873	Buchcik), XInclude testing, Notation serialization, UTF8ToISO8859x
				874	transcoding (Mark Itzcovitz), lots of XML Schemas cleanup and fixes
				875	(Kasimier), ChangeLog cleanup (Stepan Kasal), memory fixes (Mark Vakoc),
				876	handling of failed realloc(), out of bound array adressing in Schemas
				877	date handling, Python space/tabs cleanups (Malcolm Tredinnick), NMTOKENS
Daniel Veillard	6927b10	2004-10-27 17:29:04 +0000	[diff] [blame]	878	E20 validation fix (Malcolm),</li>
Daniel Veillard	210818b	2004-09-29 15:50:37 +0000	[diff] [blame]	879	<li>improvements: added W3C XML Schemas testsuite (Kasimier Buchcik), add
				880	xmlSchemaValidateOneElement (Kasimier), Python exception hierearchy
				881	(Malcolm Tredinnick), Python libxml2 driver improvement (Malcolm
				882	Tredinnick), Schemas support for xsi:schemaLocation,
				883	xsi:noNamespaceSchemaLocation, xsi:type (Kasimier Buchcik)</li>
				884	</ul>
				885
Daniel Veillard	d1de4a3	2004-08-31 13:43:07 +0000	[diff] [blame]	886	<h3>2.6.13: Aug 31 2004</h3>
				887	<ul>
				888	<li>build fixes: Windows and zlib (Igor Zlatkovic), -O flag with gcc,
Daniel Veillard	210818b	2004-09-29 15:50:37 +0000	[diff] [blame]	889	Solaris compiler warning, fixing RPM BuildRequires,</li>
Daniel Veillard	d1de4a3	2004-08-31 13:43:07 +0000	[diff] [blame]	890	<li>fixes: DTD loading on Windows (Igor), Schemas error reports APIs
				891	(Kasimier Buchcik), Schemas validation crash, xmlCheckUTF8 (William Brack
				892	and Julius Mittenzwei), Schemas facet check (Kasimier), default namespace
				893	problem (William), Schemas hexbinary empty values, encoding error could
				894	genrate a serialization loop.</li>
				895	<li>Improvements: Schemas validity improvements (Kasimier), added --path
				896	and --load-trace options to xmllint</li>
				897	<li>documentation: tutorial update (John Fleck)</li>
				898	</ul>
				899
Daniel Veillard	b331fff	2004-08-22 14:21:57 +0000	[diff] [blame]	900	<h3>2.6.12: Aug 22 2004</h3>
				901	<ul>
				902	<li>build fixes: fix --with-minimum, elfgcchack.h fixes (Peter
				903	Breitenlohner), perl path lookup (William), diff on Solaris (Albert
				904	Chin), some 64bits cleanups.</li>
				905	<li>Python: avoid a warning with 2.3 (William Brack), tab and space mixes
				906	(William), wrapper generator fixes (William), Cygwin support (Gerrit P.
				907	Haase), node wrapper fix (Marc-Antoine Parent), XML Schemas support
				908	(Torkel Lyng)</li>
				909	<li>Schemas: a lot of bug fixes and improvements from Kasimier Buchcik</li>
				910	<li>fixes: RVT fixes (William), XPath context resets bug (William), memory
				911	debug (Steve Hay), catalog white space handling (Peter Breitenlohner),
				912	xmlReader state after attribute reading (William), structured error
				913	handler (William), XInclude generated xml:base fixup (William), Windows
				914	memory reallocation problem (Steve Hay), Out of Memory conditions
				915	handling (William and Olivier Andrieu), htmlNewDoc() charset bug,
				916	htmlReadMemory init (William), a posteriori validation DTD base
				917	(William), notations serialization missing, xmlGetNodePath (Dodji),
				918	xmlCheckUTF8 (Diego Tartara), missing line numbers on entity
				919	(William)</li>
				920	<li>improvements: DocBook catalog build scrip (William), xmlcatalog tool
				921	(Albert Chin), xmllint --c14n option, no_proxy environment (Mike Hommey),
				922	xmlParseInNodeContext() addition, extend xmllint --shell, allow XInclude
				923	to not generate start/end nodes, extend xmllint --version to include CVS
				924	tag (William)</li>
				925	<li>documentation: web pages fixes, validity API docs fixes (William)
				926	schemas API fix (Eric Haszlakiewicz), xmllint man page (John Fleck)</li>
				927	</ul>
				928
Daniel Veillard	45cb0f4	2004-07-05 17:45:35 +0000	[diff] [blame]	929	<h3>2.6.11: July 5 2004</h3>
				930	<ul>
				931	<li>Schemas: a lot of changes and improvements by Kasimier Buchcik for
				932	attributes, namespaces and simple types.</li>
				933	<li>build fixes: --with-minimum (William Brack), some gcc cleanup
				934	(William), --with-thread-alloc (William)</li>
				935	<li>portability: Windows binary package change (Igor Zlatkovic), Catalog
				936	path on Windows</li>
				937	<li>documentation: update to the tutorial (John Fleck), xmllint return code
Daniel Veillard	b331fff	2004-08-22 14:21:57 +0000	[diff] [blame]	938	(John Fleck), man pages (Ville Skytta),</li>
Daniel Veillard	45cb0f4	2004-07-05 17:45:35 +0000	[diff] [blame]	939	<li>bug fixes: C14N bug serializing namespaces (Aleksey Sanin), testSAX
				940	properly initialize the library (William), empty node set in XPath
				941	(William), xmlSchemas errors (William), invalid charref problem pointed
				942	by Morus Walter, XInclude xml:base generation (William), Relax-NG bug
Daniel Veillard	b331fff	2004-08-22 14:21:57 +0000	[diff] [blame]	943	with div processing (William), XPointer and xml:base problem(William),
Daniel Veillard	45cb0f4	2004-07-05 17:45:35 +0000	[diff] [blame]	944	Reader and entities, xmllint return code for schemas (William), reader
				945	streaming problem (Steve Ball), DTD serialization problem (William),
				946	libxml.m4 fixes (Mike Hommey), do not provide destructors as methods on
				947	Python classes, xmlReader buffer bug, Python bindings memory interfaces
				948	improvement (with Stéphane Bidoul), Fixed the push parser to be back to
				949	synchronous behaviour.</li>
				950	<li>improvement: custom per-thread I/O enhancement (Rob Richards), register
				951	namespace in debug shell (Stefano Debenedetti), Python based regression
				952	test for non-Unix users (William), dynamically increase the number of
				953	XPath extension functions in Python and fix a memory leak (Marc-Antoine
				954	Parent and William)</li>
				955	<li>performance: hack done with Arjan van de Ven to reduce ELF footprint
				956	and generated code on Linux, plus use gcc runtime profiling to optimize
				957	the code generated in the RPM packages.</li>
				958	</ul>
				959
Daniel Veillard	8120501	2004-05-18 03:06:41 +0000	[diff] [blame]	960	<h3>2.6.10: May 17 2004</h3>
				961	<ul>
				962	<li>Web page generated for ChangeLog</li>
				963	<li>build fixes: --without-html problems, make check without make all</li>
				964	<li>portability: problem with xpath.c on Windows (MSC and Borland), memcmp
				965	vs. strncmp on Solaris, XPath tests on Windows (Mark Vakoc), C++ do not
				966	use "list" as parameter name, make tests work with Python 1.5 (Ed
				967	Davis),</li>
				968	<li>improvements: made xmlTextReaderMode public, small buffers resizing
				969	(Morten Welinder), add --maxmem option to xmllint, add
				970	xmlPopInputCallback() for Matt Sergeant, refactoring of serialization
Daniel Veillard	45cb0f4	2004-07-05 17:45:35 +0000	[diff] [blame]	971	escaping, added escaping customization</li>
Daniel Veillard	8120501	2004-05-18 03:06:41 +0000	[diff] [blame]	972	<li>bugfixes: xsd:extension (Taihei Goi), assorted regexp bugs (William
				973	Brack), xmlReader end of stream problem, node deregistration with reader,
				974	URI escaping and filemanes, XHTML1 formatting (Nick Wellnhofer), regexp
				975	transition reduction (William), various XSD Schemas fixes (Kasimier
				976	Buchcik), XInclude fallback problem (William), weird problems with DTD
				977	(William), structured error handler callback context (William), reverse
				978	xmlEncodeSpecialChars() behaviour back to escaping '"'</li>
				979	</ul>
				980
Daniel Veillard	eca726d	2004-04-18 21:47:34 +0000	[diff] [blame]	981	<h3>2.6.9: Apr 18 2004</h3>
				982	<ul>
				983	<li>implement xml:id Working Draft, relaxed XPath id() checking</li>
				984	<li>bugfixes: xmlCtxtReset (Brent Hendricks), line number and CDATA (Dave
				985	Beckett), Relax-NG compilation (William Brack), Regexp patches (with
				986	William), xmlUriEscape (Mark Vakoc), a Relax-NG notAllowed problem (with
				987	William), Relax-NG name classes compares (William), XInclude duplicate
				988	fallback (William), external DTD encoding detection (William), a DTD
				989	validation bug (William), xmlReader Close() fix, recusive extention
				990	schemas</li>
				991	<li>improvements: use xmlRead* APIs in test tools (Mark Vakoc), indenting
				992	save optimization, better handle IIS broken HTTP redirect behaviour (Ian
				993	Hummel), HTML parser frameset (James Bursa), libxml2-python RPM
				994	dependancy, XML Schemas union support (Kasimier Buchcik), warning removal
				995	clanup (William), keep ChangeLog compressed when installing from RPMs</li>
				996	<li>documentation: examples and xmlDocDumpMemory docs (John Fleck), new
Daniel Veillard	d4cfcef	2004-05-06 18:55:27 +0000	[diff] [blame]	997	example (load, xpath, modify, save), xmlCatalogDump() comments,</li>
Daniel Veillard	eca726d	2004-04-18 21:47:34 +0000	[diff] [blame]	998	<li>Windows: Borland C++ builder (Eric Zurcher), work around Microsoft
				999	compiler NaN handling bug (Mark Vakoc)</li>
				1000	</ul>
				1001
Daniel Veillard	252004d	2004-03-23 12:32:32 +0000	[diff] [blame]	1002	<h3>2.6.8: Mar 23 2004</h3>
				1003	<ul>
				1004	<li>First step of the cleanup of the serialization code and APIs</li>
				1005	<li>XML Schemas: mixed content (Adam Dickmeiss), QName handling fixes (Adam
				1006	Dickmeiss), anyURI for "" (John Belmonte)</li>
				1007	<li>Python: Canonicalization C14N support added (Anthony Carrico)</li>
				1008	<li>xmlDocCopyNode() extension (William)</li>
				1009	<li>Relax-NG: fix when processing XInclude results (William), external
				1010	reference in interleave (William), missing error on <choice>
				1011	failure (William), memory leak in schemas datatype facets.</li>
				1012	<li>xmlWriter: patch for better DTD support (Alfred Mickautsch)</li>
				1013	<li>bug fixes: xmlXPathLangFunction memory leak (Mike Hommey and William
				1014	Brack), no ID errors if using HTML_PARSE_NOERROR, xmlcatalog fallbacks to
				1015	URI on SYSTEM lookup failure, XInclude parse flags inheritance (William),
				1016	XInclude and XPointer fixes for entities (William), XML parser bug
				1017	reported by Holger Rauch, nanohttp fd leak (William), regexps char
				1018	groups '-' handling (William), dictionnary reference counting problems,
Daniel Veillard	d99224d	2004-04-06 10:04:16 +0000	[diff] [blame]	1019	do not close stderr.</li>
Daniel Veillard	252004d	2004-03-23 12:32:32 +0000	[diff] [blame]	1020	<li>performance patches from Petr Pajas</li>
				1021	<li>Documentation fixes: XML_CATALOG_FILES in man pages (Mike Hommey)</li>
				1022	<li>compilation and portability fixes: --without-valid, catalog cleanups
				1023	(Peter Breitenlohner), MingW patch (Roland Schwingel), cross-compilation
				1024	to Windows (Christophe de Vienne), --with-html-dir fixup (Julio Merino
				1025	Vidal), Windows build (Eric Zurcher)</li>
				1026	</ul>
				1027
Daniel Veillard	9291449	2004-02-23 16:33:21 +0000	[diff] [blame]	1028	<h3>2.6.7: Feb 23 2004</h3>
				1029	<ul>
				1030	<li>documentation: tutorial updates (John Fleck), benchmark results</li>
				1031	<li>xmlWriter: updates and fixes (Alfred Mickautsch, Lucas Brasilino)</li>
				1032	<li>XPath optimization (Petr Pajas)</li>
				1033	<li>DTD ID handling optimization</li>
				1034	<li>bugfixes: xpath number with > 19 fractional (William Brack), push
				1035	mode with unescaped '>' characters, fix xmllint --stream --timing, fix
				1036	xmllint --memory --stream memory usage, xmlAttrSerializeTxtContent
				1037	handling NULL, trying to fix Relax-NG/Perl interface.</li>
				1038	<li>python: 2.3 compatibility, whitespace fixes (Malcolm Tredinnick)</li>
				1039	<li>Added relaxng option to xmllint --shell</li>
				1040	</ul>
				1041
Daniel Veillard	5c9547e	2004-02-12 15:31:49 +0000	[diff] [blame]	1042	<h3>2.6.6: Feb 12 2004</h3>
				1043	<ul>
				1044	<li>nanohttp and nanoftp: buffer overflow error on URI parsing (Igor and
				1045	William) reported by Yuuichi Teranishi</li>
				1046	<li>bugfixes: make test and path issues, xmlWriter attribute serialization
				1047	(William Brack), xmlWriter indentation (William), schemas validation
				1048	(Eric Haszlakiewicz), XInclude dictionnaries issues (William and Oleg
				1049	Paraschenko), XInclude empty fallback (William), HTML warnings (William),
				1050	XPointer in XInclude (William), Python namespace serialization,
				1051	isolat1ToUTF8 bound error (Alfred Mickautsch), output of parameter
				1052	entities in internal subset (William), internal subset bug in push mode,
				1053	<xs:all> fix (Alexey Sarytchev)</li>
				1054	<li>Build: fix for automake-1.8 (Alexander Winston), warnings removal
				1055	(Philip Ludlam), SOCKLEN_T detection fixes (Daniel Richard), fix
				1056	--with-minimum configuration.</li>
				1057	<li>XInclude: allow the 2001 namespace without warning.</li>
				1058	<li>Documentation: missing example/index.html (John Fleck), version
				1059	dependancies (John Fleck)</li>
				1060	<li>reader API: structured error reporting (Steve Ball)</li>
				1061	<li>Windows compilation: mingw, msys (Mikhail Grushinskiy), function
				1062	prototype (Cameron Johnson), MSVC6 compiler warnings, _WINSOCKAPI_
				1063	patch</li>
				1064	<li>Parsers: added xmlByteConsumed(ctxt) API to get the byte offest in
				1065	input.</li>
				1066	</ul>
				1067
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	1068	<h3>2.6.5: Jan 25 2004</h3>
				1069	<ul>
				1070	<li>Bugfixes: dictionnaries for schemas (William Brack), regexp segfault
				1071	(William), xs:all problem (William), a number of XPointer bugfixes
				1072	(William), xmllint error go to stderr, DTD validation problem with
				1073	namespace, memory leak (William), SAX1 cleanup and minimal options fixes
				1074	(Mark Vadoc), parser context reset on error (Shaun McCance), XPath union
				1075	evaluation problem (William) , xmlReallocLoc with NULL (Aleksey Sanin),
				1076	XML Schemas double free (Steve Ball), XInclude with no href, argument
				1077	callbacks order for XPath callbacks (Frederic Peters)</li>
				1078	<li>Documentation: python scripts (William Brack), xslt stylesheets (John
				1079	Fleck), doc (Sven Zimmerman), I/O example.</li>
				1080	<li>Python bindings: fixes (William), enum support (Stéphane Bidoul),
				1081	structured error reporting (Stéphane Bidoul)</li>
				1082	<li>XInclude: various fixes for conformance, problem related to dictionnary
				1083	references (William & me), recursion (William)</li>
				1084	<li>xmlWriter: indentation (Lucas Brasilino), memory leaks (Alfred
Daniel Veillard	5c9547e	2004-02-12 15:31:49 +0000	[diff] [blame]	1085	Mickautsch),</li>
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	1086	<li>xmlSchemas: normalizedString datatype (John Belmonte)</li>
				1087	<li>code cleanup for strings functions (William)</li>
				1088	<li>Windows: compiler patches (Mark Vakoc)</li>
				1089	<li>Parser optimizations, a few new XPath and dictionnary APIs for future
				1090	XSLT optimizations.</li>
				1091	</ul>
				1092
Daniel Veillard	e6e59cd	2003-12-24 11:56:44 +0000	[diff] [blame]	1093	<h3>2.6.4: Dec 24 2003</h3>
				1094	<ul>
				1095	<li>Windows build fixes (Igor Zlatkovic)</li>
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	1096	<li>Some serious XInclude problems reported by Oleg Paraschenko and</li>
				1097	<li>Unix and Makefile packaging fixes (me, William Brack,</li>
Daniel Veillard	e6e59cd	2003-12-24 11:56:44 +0000	[diff] [blame]	1098	<li>Documentation improvements (John Fleck, William Brack), example fix
				1099	(Lucas Brasilino)</li>
				1100	<li>bugfixes: xmlTextReaderExpand() with xmlReaderWalker, XPath handling of
				1101	NULL strings (William Brack) , API building reader or parser from
				1102	filedescriptor should not close it, changed XPath sorting to be stable
				1103	again (William Brack), xmlGetNodePath() generating '(null)' (William
				1104	Brack), DTD validation and namespace bug (William Brack), XML Schemas
				1105	double inclusion behaviour</li>
				1106	</ul>
				1107
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	1108	<h3>2.6.3: Dec 10 2003</h3>
				1109	<ul>
				1110	<li>documentation updates and cleanup (DV, William Brack, John Fleck)</li>
				1111	<li>added a repository of examples, examples from Aleksey Sanin, Dodji
Daniel Veillard	e6e59cd	2003-12-24 11:56:44 +0000	[diff] [blame]	1112	Seketeli, Alfred Mickautsch</li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	1113	<li>Windows updates: Mark Vakoc, Igor Zlatkovic, Eric Zurcher, Mingw
				1114	(Kenneth Haley)</li>
				1115	<li>Unicode range checking (William Brack)</li>
				1116	<li>code cleanup (William Brack)</li>
				1117	<li>Python bindings: doc (John Fleck), bug fixes</li>
				1118	<li>UTF-16 cleanup and BOM issues (William Brack)</li>
				1119	<li>bug fixes: ID and xmlReader validation, XPath (William Brack),
				1120	xmlWriter (Alfred Mickautsch), hash.h inclusion problem, HTML parser
				1121	(James Bursa), attribute defaulting and validation, some serialization
				1122	cleanups, XML_GET_LINE macro, memory debug when using threads (William
				1123	Brack), serialization of attributes and entities content, xmlWriter
				1124	(Daniel Schulman)</li>
				1125	<li>XInclude bugfix, new APIs and update to the last version including the
				1126	namespace change.</li>
				1127	<li>XML Schemas improvements: include (Robert Stepanek), import and
				1128	namespace handling, fixed the regression tests troubles, added examples
Daniel Veillard	e6e59cd	2003-12-24 11:56:44 +0000	[diff] [blame]	1129	based on Eric van der Vlist book, regexp fixes</li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	1130	<li>preliminary pattern support for streaming (needed for schemas
				1131	constraints), added xmlTextReaderPreservePattern() to collect subdocument
				1132	when streaming.</li>
				1133	<li>various fixes in the structured error handling</li>
				1134	</ul>
				1135
Daniel Veillard	6d373a2	2003-11-04 10:26:43 +0000	[diff] [blame]	1136	<h3>2.6.2: Nov 4 2003</h3>
				1137	<ul>
				1138	<li>XPath context unregistration fixes</li>
				1139	<li>text node coalescing fixes (Mark Lilback)</li>
				1140	<li>API to screate a W3C Schemas from an existing document (Steve Ball)</li>
				1141	<li>BeOS patches (Marcin 'Shard' Konicki)</li>
				1142	<li>xmlStrVPrintf function added (Aleksey Sanin)</li>
				1143	<li>compilation fixes (Mark Vakoc)</li>
				1144	<li>stdin parsing fix (William Brack)</li>
				1145	<li>a posteriori DTD validation fixes</li>
Daniel Veillard	c480c4e	2003-12-10 13:24:38 +0000	[diff] [blame]	1146	<li>xmlReader bug fixes: Walker fixes, python bindings</li>
Daniel Veillard	6d373a2	2003-11-04 10:26:43 +0000	[diff] [blame]	1147	<li>fixed xmlStopParser() to really stop the parser and errors</li>
				1148	<li>always generate line numbers when using the new xmlReadxxx
				1149	functions</li>
				1150	<li>added XInclude support to the xmlReader interface</li>
				1151	<li>implemented XML_PARSE_NONET parser option</li>
				1152	<li>DocBook XSLT processing bug fixed</li>
				1153	<li>HTML serialization for <p> elements (William Brack and me)</li>
				1154	<li>XPointer failure in XInclude are now handled as resource errors</li>
				1155	<li>fixed xmllint --html to use the HTML serializer on output (added
				1156	--xmlout to implement the previous behaviour of saving it using the XML
				1157	serializer)</li>
				1158	</ul>
				1159
Daniel Veillard	e4e3f5d	2003-10-28 23:06:32 +0000	[diff] [blame]	1160	<h3>2.6.1: Oct 28 2003</h3>
				1161	<ul>
				1162	<li>Mostly bugfixes after the big 2.6.0 changes</li>
				1163	<li>Unix compilation patches: libxml.m4 (Patrick Welche), warnings cleanup
				1164	(William Brack)</li>
				1165	<li>Windows compilation patches (Joachim Bauch, Stephane Bidoul, Igor
				1166	Zlatkovic)</li>
				1167	<li>xmlWriter bugfix (Alfred Mickautsch)</li>
				1168	<li>chvalid.[ch]: couple of fixes from Stephane Bidoul</li>
Daniel Veillard	6d373a2	2003-11-04 10:26:43 +0000	[diff] [blame]	1169	<li>context reset: error state reset, push parser reset (Graham
				1170	Bennett)</li>
Daniel Veillard	e4e3f5d	2003-10-28 23:06:32 +0000	[diff] [blame]	1171	<li>context reuse: generate errors if file is not readable</li>
				1172	<li>defaulted attributes for element coming from internal entities
				1173	(Stephane Bidoul)</li>
				1174	<li>Python: tab and spaces mix (William Brack)</li>
				1175	<li>Error handler could crash in DTD validation in 2.6.0</li>
				1176	<li>xmlReader: do not use the document or element _private field</li>
				1177	<li>testSAX.c: avoid a problem with some PIs (Massimo Morara)</li>
				1178	<li>general bug fixes: mandatory encoding in text decl, serializing
				1179	Document Fragment nodes, xmlSearchNs 2.6.0 problem (Kasimier Buchcik),
				1180	XPath errors not reported, slow HTML parsing of large documents.</li>
				1181	</ul>
				1182
Daniel Veillard	3e35f8e	2003-10-21 00:05:38 +0000	[diff] [blame]	1183	<h3>2.6.0: Oct 20 2003</h3>
				1184	<ul>
				1185	<li>Major revision release: should be API and ABI compatible but got a lot
				1186	of change</li>
				1187	<li>Increased the library modularity, far more options can be stripped out,
				1188	a --with-minimum configuration will weight around 160KBytes</li>
				1189	<li>Use per parser and per document dictionnary, allocate names and small
				1190	text nodes from the dictionnary</li>
				1191	<li>Switch to a SAX2 like parser rewrote most of the XML parser core,
				1192	provides namespace resolution and defaulted attributes, minimize memory
				1193	allocations and copies, namespace checking and specific error handling,
				1194	immutable buffers, make predefined entities static structures, etc...</li>
				1195	<li>rewrote all the error handling in the library, all errors can be
				1196	intercepted at a structured level, with precise information
				1197	available.</li>
				1198	<li>New simpler and more generic XML and HTML parser APIs, allowing to
				1199	easilly modify the parsing options and reuse parser context for multiple
				1200	consecutive documents.</li>
				1201	<li>Similar new APIs for the xmlReader, for options and reuse, provided new
				1202	functions to access content as const strings, use them for Python
				1203	bindings</li>
				1204	<li>a lot of other smaller API improvements: xmlStrPrintf (Aleksey Sanin),
				1205	Walker i.e. reader on a document tree based on Alfred Mickautsch code,
				1206	make room in nodes for line numbers, reference counting and future PSVI
				1207	extensions, generation of character ranges to be checked with faster
				1208	algorithm (William), xmlParserMaxDepth (Crutcher Dunnavant), buffer
				1209	access</li>
				1210	<li>New xmlWriter API provided by Alfred Mickautsch</li>
				1211	<li>Schemas: base64 support by Anthony Carrico</li>
				1212	<li>Parser<->HTTP integration fix, proper processing of the Mime-Type
				1213	and charset informations if available.</li>
				1214	<li>Relax-NG: bug fixes including the one reported by Martijn Faassen and
				1215	zeroOrMore, better error reporting.</li>
				1216	<li>Python bindings (Stéphane Bidoul), never use stdout for errors
				1217	output</li>
				1218	<li>Portability: all the headers have macros for export and calling
				1219	convention definitions (Igor Zlatkovic), VMS update (Craig A. Berry),
				1220	Windows: threads (Jesse Pelton), Borland compiler (Eric Zurcher, Igor),
				1221	Mingw (Igor), typos (Mark Vakoc), beta version (Stephane Bidoul),
				1222	warning cleanups on AIX and MIPS compilers (William Brack), BeOS (Marcin
				1223	'Shard' Konicki)</li>
				1224	<li>Documentation fixes and README (William Brack), search fix (William),
				1225	tutorial updates (John Fleck), namespace docs (Stefan Kost)</li>
				1226	<li>Bug fixes: xmlCleanupParser (Dave Beckett), threading uninitialized
				1227	mutexes, HTML doctype lowercase, SAX/IO (William), compression detection
				1228	and restore (William), attribute declaration in DTDs (William), namespace
				1229	on attribute in HTML output (William), input filename (Rob Richards),
				1230	namespace DTD validation, xmlReplaceNode (Chris Ryland), I/O callbacks
				1231	(Markus Keim), CDATA serialization (Shaun McCance), xmlReader (Peter
				1232	Derr), high codepoint charref like &#x10FFFF;, buffer access in push
				1233	mode (Justin Fletcher), TLS threads on Windows (Jesse Pelton), XPath bug
				1234	(William), xmlCleanupParser (Marc Liyanage), CDATA output (William), HTTP
				1235	error handling.</li>
				1236	<li>xmllint options: --dtdvalidfpi for Tobias Reif, --sax1 for compat
				1237	testing, --nodict for building without tree dictionnary, --nocdata to
				1238	replace CDATA by text, --nsclean to remove surperfluous namespace
				1239	declarations</li>
				1240	<li>added xml2-config --libtool-libs option from Kevin P. Fleming</li>
				1241	<li>a lot of profiling and tuning of the code, speedup patch for
				1242	xmlSearchNs() by Luca Padovani. The xmlReader should do far less
				1243	allocation and it speed should get closer to SAX. Chris Anderson worked
				1244	on speeding and cleaning up repetitive checking code.</li>
				1245	<li>cleanup of "make tests"</li>
				1246	<li>libxml-2.0-uninstalled.pc from Malcolm Tredinnick</li>
				1247	<li>deactivated the broken docBook SGML parser code and plugged the XML
				1248	parser instead.</li>
				1249	</ul>
				1250
Daniel Veillard	eec1ae9	2003-09-09 13:11:01 +0000	[diff] [blame]	1251	<h3>2.5.11: Sep 9 2003</h3>
				1252
				1253	<p>A bugfix only release:</p>
				1254	<ul>
				1255	<li>risk of crash in Relax-NG</li>
				1256	<li>risk of crash when using multithreaded programs</li>
				1257	</ul>
				1258
Daniel Veillard	cfba2fe	2003-08-15 00:33:43 +0000	[diff] [blame]	1259	<h3>2.5.10: Aug 15 2003</h3>
				1260
				1261	<p>A bugfixes only release</p>
				1262	<ul>
				1263	<li>Windows Makefiles (William Brack)</li>
				1264	<li>UTF-16 support fixes (Mark Itzcovitz)</li>
				1265	<li>Makefile and portability (William Brack) automake, Linux alpha, Mingw
Daniel Veillard	eec1ae9	2003-09-09 13:11:01 +0000	[diff] [blame]	1266	on Windows (Mikhail Grushinskiy)</li>
Daniel Veillard	cfba2fe	2003-08-15 00:33:43 +0000	[diff] [blame]	1267	<li>HTML parser (Oliver Stoeneberg)</li>
				1268	<li>XInclude performance problem reported by Kevin Ruscoe</li>
				1269	<li>XML parser performance problem reported by Grant Goodale</li>
				1270	<li>xmlSAXParseDTD() bug fix from Malcolm Tredinnick</li>
Daniel Veillard	eec1ae9	2003-09-09 13:11:01 +0000	[diff] [blame]	1271	<li>and a couple other cleanup</li>
Daniel Veillard	cfba2fe	2003-08-15 00:33:43 +0000	[diff] [blame]	1272	</ul>
				1273
Daniel Veillard	83ee40d	2003-08-09 22:24:09 +0000	[diff] [blame]	1274	<h3>2.5.9: Aug 9 2003</h3>
				1275	<ul>
				1276	<li>bugfixes: IPv6 portability, xmlHasNsProp (Markus Keim), Windows build
				1277	(Wiliam Brake, Jesse Pelton, Igor), Schemas (Peter Sobisch), threading
				1278	(Rob Richards), hexBinary type (), UTF-16 BOM (Dodji Seketeli),
				1279	xmlReader, Relax-NG schemas compilation, namespace handling, EXSLT (Sean
				1280	Griffin), HTML parsing problem (William Brack), DTD validation for mixed
				1281	content + namespaces, HTML serialization, library initialization,
				1282	progressive HTML parser</li>
				1283	<li>better interfaces for Relax-NG error handling (Joachim Bauch, )</li>
				1284	<li>adding xmlXIncludeProcessTree() for XInclud'ing in a subtree</li>
				1285	<li>doc fixes and improvements (John Fleck)</li>
				1286	<li>configure flag for -with-fexceptions when embedding in C++</li>
				1287	<li>couple of new UTF-8 helper functions (William Brack)</li>
				1288	<li>general encoding cleanup + ISO-8859-x without iconv (Peter Jacobi)</li>
				1289	<li>xmlTextReader cleanup + enum for node types (Bjorn Reese)</li>
				1290	<li>general compilation/warning cleanup Solaris/HP-UX/... (William
				1291	Brack)</li>
				1292	</ul>
				1293
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	1294	<h3>2.5.8: Jul 6 2003</h3>
				1295	<ul>
				1296	<li>bugfixes: XPath, XInclude, file/URI mapping, UTF-16 save (Mark
				1297	Itzcovitz), UTF-8 checking, URI saving, error printing (William Brack),
				1298	PI related memleak, compilation without schemas or without xpath (Joerg
				1299	Schmitz-Linneweber/Garry Pennington), xmlUnlinkNode problem with DTDs,
				1300	rpm problem on , i86_64, removed a few compilation problems from 2.5.7,
				1301	xmlIOParseDTD, and xmlSAXParseDTD (Malcolm Tredinnick)</li>
				1302	<li>portability: DJGPP (MsDos) , OpenVMS (Craig A. Berry)</li>
				1303	<li>William Brack fixed multithreading lock problems</li>
				1304	<li>IPv6 patch for FTP and HTTP accesses (Archana Shah/Wipro)</li>
				1305	<li>Windows fixes (Igor Zlatkovic, Eric Zurcher), threading (Stéphane
				1306	Bidoul)</li>
				1307	<li>A few W3C Schemas Structure improvements</li>
				1308	<li>W3C Schemas Datatype improvements (Charlie Bozeman)</li>
				1309	<li>Python bindings for thread globals (Stéphane Bidoul), and method/class
Daniel Veillard	83ee40d	2003-08-09 22:24:09 +0000	[diff] [blame]	1310	generator</li>
				1311	<li>added --nonet option to xmllint</li>
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	1312	<li>documentation improvements (John Fleck)</li>
				1313	</ul>
				1314
Daniel Veillard	92fc02c	2003-04-24 23:12:35 +0000	[diff] [blame]	1315	<h3>2.5.7: Apr 25 2003</h3>
				1316	<ul>
				1317	<li>Relax-NG: Compiling to regexp and streaming validation on top of the
				1318	xmlReader interface, added to xmllint --stream</li>
				1319	<li>xmlReader: Expand(), Next() and DOM access glue, bug fixes</li>
				1320	<li>Support for large files: RGN validated a 4.5GB instance</li>
				1321	<li>Thread support is now configured in by default</li>
				1322	<li>Fixes: update of the Trio code (Bjorn), WXS Date and Duration fixes
				1323	(Charles Bozeman), DTD and namespaces (Brent Hendricks), HTML push parser
				1324	and zero bytes handling, some missing Windows file path conversions,
				1325	behaviour of the parser and validator in the presence of "out of memory"
Daniel Veillard	93d9525	2003-04-29 20:25:40 +0000	[diff] [blame]	1326	error conditions</li>
Daniel Veillard	92fc02c	2003-04-24 23:12:35 +0000	[diff] [blame]	1327	<li>extended the API to be able to plug a garbage collecting memory
				1328	allocator, added xmlMallocAtomic() and modified the allocations
				1329	accordingly.</li>
				1330	<li>Performances: removed excessive malloc() calls, speedup of the push and
				1331	xmlReader interfaces, removed excessive thread locking</li>
				1332	<li>Documentation: man page (John Fleck), xmlReader documentation</li>
				1333	<li>Python: adding binding for xmlCatalogAddLocal (Brent M Hendricks)</li>
				1334	</ul>
				1335
Daniel Veillard	c2d4a93	2003-04-01 11:13:05 +0000	[diff] [blame]	1336	<h3>2.5.6: Apr 1 2003</h3>
				1337	<ul>
				1338	<li>Fixed W3C XML Schemas datatype, should be compliant now except for
				1339	binHex and base64 which are not supported yet.</li>
				1340	<li>bug fixes: non-ASCII IDs, HTML output, XInclude on large docs and
				1341	XInclude entities handling, encoding detection on external subsets, XML
				1342	Schemas bugs and memory leaks, HTML parser (James Bursa)</li>
				1343	<li>portability: python/trio (Albert Chin), Sun compiler warnings</li>
				1344	<li>documentation: added --relaxng option to xmllint man page (John)</li>
				1345	<li>improved error reporting: xml:space, start/end tag mismatches, Relax NG
				1346	errors</li>
				1347	</ul>
				1348
				1349	<h3>2.5.5: Mar 24 2003</h3>
Daniel Veillard	d8da01c	2003-03-24 15:58:23 +0000	[diff] [blame]	1350	<ul>
				1351	<li>Lot of fixes on the Relax NG implementation. More testing including
				1352	DocBook and TEI examples.</li>
				1353	<li>Increased the support for W3C XML Schemas datatype</li>
				1354	<li>Several bug fixes in the URI handling layer</li>
				1355	<li>Bug fixes: HTML parser, xmlReader, DTD validation, XPath, encoding
				1356	conversion, line counting in the parser.</li>
				1357	<li>Added support for $XMLLINT_INDENT environment variable, FTP delete</li>
				1358	<li>Fixed the RPM spec file name</li>
				1359	</ul>
				1360
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	1361	<h3>2.5.4: Feb 20 2003</h3>
				1362	<ul>
				1363	<li>Conformance testing and lot of fixes on Relax NG and XInclude
				1364	implementation</li>
				1365	<li>Implementation of XPointer element() scheme</li>
				1366	<li>Bug fixes: XML parser, XInclude entities merge, validity checking on
				1367	namespaces,
				1368	<p>2 serialization bugs, node info generation problems, a DTD regexp
				1369	generation problem.</p>
				1370	</li>
				1371	<li>Portability: windows updates and path canonicalization (Igor)</li>
				1372	<li>A few typo fixes (Kjartan Maraas)</li>
				1373	<li>Python bindings generator fixes (Stephane Bidoul)</li>
				1374	</ul>
				1375
Daniel Veillard	1d788d2	2003-02-10 16:21:58 +0000	[diff] [blame]	1376	<h3>2.5.3: Feb 10 2003</h3>
				1377	<ul>
				1378	<li>RelaxNG and XML Schemas datatypes improvements, and added a first
				1379	version of RelaxNG Python bindings</li>
				1380	<li>Fixes: XLink (Sean Chittenden), XInclude (Sean Chittenden), API fix for
				1381	serializing namespace nodes, encoding conversion bug, XHTML1
				1382	serialization</li>
				1383	<li>Portability fixes: Windows (Igor), AMD 64bits RPM spec file</li>
				1384	</ul>
				1385
Daniel Veillard	72fef16	2003-02-05 14:31:19 +0000	[diff] [blame]	1386	<h3>2.5.2: Feb 5 2003</h3>
				1387	<ul>
				1388	<li>First implementation of RelaxNG, added --relaxng flag to xmllint</li>
				1389	<li>Schemas support now compiled in by default.</li>
				1390	<li>Bug fixes: DTD validation, namespace checking, XInclude and entities,
				1391	delegateURI in XML Catalogs, HTML parser, XML reader (Stéphane Bidoul),
				1392	XPath parser and evaluation, UTF8ToUTF8 serialization, XML reader memory
				1393	consumption, HTML parser, HTML serialization in the presence of
				1394	namespaces</li>
				1395	<li>added an HTML API to check elements and attributes.</li>
				1396	<li>Documentation improvement, PDF for the tutorial (John Fleck), doc
				1397	patches (Stefan Kost)</li>
				1398	<li>Portability fixes: NetBSD (Julio Merino), Windows (Igor Zlatkovic)</li>
				1399	<li>Added python bindings for XPointer, contextual error reporting
				1400	(Stéphane Bidoul)</li>
				1401	<li>URI/file escaping problems (Stefano Zacchiroli)</li>
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	1402	</ul>
				1403
Daniel Veillard	e2830f1	2003-01-08 17:47:49 +0000	[diff] [blame]	1404	<h3>2.5.1: Jan 8 2003</h3>
				1405	<ul>
				1406	<li>Fixes a memory leak and configuration/compilation problems in 2.5.0</li>
				1407	<li>documentation updates (John)</li>
				1408	<li>a couple of XmlTextReader fixes</li>
				1409	</ul>
				1410
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	1411	<h3>2.5.0: Jan 6 2003</h3>
				1412	<ul>
				1413	<li>New <a href="xmlreader.html">XmltextReader interface</a> based on C#
				1414	API (with help of Stéphane Bidoul)</li>
				1415	<li>Windows: more exports, including the new API (Igor)</li>
				1416	<li>XInclude fallback fix</li>
				1417	<li>Python: bindings for the new API, packaging (Stéphane Bidoul),
				1418	drv_libxml2.py Python xml.sax driver (Stéphane Bidoul), fixes, speedup
				1419	and iterators for Python-2.2 (Hannu Krosing)</li>
				1420	<li>Tutorial fixes (john Fleck and Niraj Tolia) xmllint man update
				1421	(John)</li>
				1422	<li>Fix an XML parser bug raised by Vyacheslav Pindyura</li>
				1423	<li>Fix for VMS serialization (Nigel Hall) and config (Craig A. Berry)</li>
				1424	<li>Entities handling fixes</li>
				1425	<li>new API to optionally track node creation and deletion (Lukas
				1426	Schroeder)</li>
				1427	<li>Added documentation for the XmltextReader interface and some <a
				1428	href="guidelines.html">XML guidelines</a></li>
				1429	</ul>
				1430
Daniel Veillard	c1eed32	2002-12-12 11:01:32 +0000	[diff] [blame]	1431	<h3>2.4.30: Dec 12 2002</h3>
				1432	<ul>
				1433	<li>2.4.29 broke the python bindings, rereleasing</li>
				1434	<li>Improvement/fixes of the XML API generator, and couple of minor code
				1435	fixes.</li>
				1436	</ul>
				1437
Daniel Veillard	9b4bb4d	2002-12-11 19:28:47 +0000	[diff] [blame]	1438	<h3>2.4.29: Dec 11 2002</h3>
				1439	<ul>
				1440	<li>Windows fixes (Igor): Windows CE port, pthread linking, python bindings
				1441	(Stéphane Bidoul), Mingw (Magnus Henoch), and export list updates</li>
				1442	<li>Fix for prev in python bindings (ERDI Gergo)</li>
				1443	<li>Fix for entities handling (Marcus Clarke)</li>
				1444	<li>Refactored the XML and HTML dumps to a single code path, fixed XHTML1
				1445	dump</li>
				1446	<li>Fix for URI parsing when handling URNs with fragment identifiers</li>
				1447	<li>Fix for HTTP URL escaping problem</li>
				1448	<li>added an TextXmlReader (C#) like API (work in progress)</li>
				1449	<li>Rewrote the API in XML generation script, includes a C parser and saves
				1450	more informations needed for C# bindings</li>
				1451	</ul>
				1452
Daniel Veillard	f9c4cad	2002-11-22 15:57:07 +0000	[diff] [blame]	1453	<h3>2.4.28: Nov 22 2002</h3>
				1454	<ul>
				1455	<li>a couple of python binding fixes</li>
				1456	<li>2 bug fixes in the XML push parser</li>
				1457	<li>potential memory leak removed (Martin Stoilov)</li>
				1458	<li>fix to the configure script for Unix (Dimitri Papadopoulos)</li>
				1459	<li>added encoding support for XInclude parse="text"</li>
				1460	<li>autodetection of XHTML1 and specific serialization rules added</li>
Daniel Veillard	9b4bb4d	2002-12-11 19:28:47 +0000	[diff] [blame]	1461	<li>nasty threading bug fixed (William Brack)</li>
Daniel Veillard	f9c4cad	2002-11-22 15:57:07 +0000	[diff] [blame]	1462	</ul>
				1463
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	1464	<h3>2.4.27: Nov 17 2002</h3>
				1465	<ul>
				1466	<li>fixes for the Python bindings</li>
				1467	<li>a number of bug fixes: SGML catalogs, xmlParseBalancedChunkMemory(),
				1468	HTML parser, Schemas (Charles Bozeman), document fragment support
				1469	(Christian Glahn), xmlReconciliateNs (Brian Stafford), XPointer,
				1470	xmlFreeNode(), xmlSAXParseMemory (Peter Jones), xmlGetNodePath (Petr
				1471	Pajas), entities processing</li>
				1472	<li>added grep to xmllint --shell</li>
				1473	<li>VMS update patch from Craig A. Berry</li>
				1474	<li>cleanup of the Windows build with support for more compilers (Igor),
				1475	better thread support on Windows</li>
				1476	<li>cleanup of Unix Makefiles and spec file</li>
				1477	<li>Improvements to the documentation (John Fleck)</li>
				1478	</ul>
				1479
Daniel Veillard	4826743	2002-10-18 11:21:38 +0000	[diff] [blame]	1480	<h3>2.4.26: Oct 18 2002</h3>
				1481	<ul>
				1482	<li>Patches for Windows CE port, improvements on Windows paths handling</li>
				1483	<li>Fixes to the validation code (DTD and Schemas), xmlNodeGetPath() ,
				1484	HTML serialization, Namespace compliance, and a number of small
				1485	problems</li>
				1486	</ul>
				1487
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	1488	<h3>2.4.25: Sep 26 2002</h3>
				1489	<ul>
				1490	<li>A number of bug fixes: XPath, validation, Python bindings, DOM and
				1491	tree, xmlI/O, Html</li>
				1492	<li>Serious rewrite of XInclude</li>
				1493	<li>Made XML Schemas regexp part of the default build and APIs, small fix
				1494	and improvement of the regexp core</li>
				1495	<li>Changed the validation code to reuse XML Schemas regexp APIs</li>
				1496	<li>Better handling of Windows file paths, improvement of Makefiles (Igor,
				1497	Daniel Gehriger, Mark Vakoc)</li>
				1498	<li>Improved the python I/O bindings, the tests, added resolver and regexp
Daniel Veillard	321be0c	2002-10-08 21:26:42 +0000	[diff] [blame]	1499	APIs</li>
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	1500	<li>New logos from Marc Liyanage</li>
				1501	<li>Tutorial improvements: John Fleck, Christopher Harris</li>
				1502	<li>Makefile: Fixes for AMD x86_64 (Mandrake), DESTDIR (Christophe
				1503	Merlet)</li>
				1504	<li>removal of all stderr/perror use for error reporting</li>
				1505	<li>Better error reporting: XPath and DTD validation</li>
				1506	<li>update of the trio portability layer (Bjorn Reese)</li>
				1507	</ul>
				1508
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	1509	<p><strong>2.4.24: Aug 22 2002</strong></p>
				1510	<ul>
				1511	<li>XPath fixes (William), xf:escape-uri() (Wesley Terpstra)</li>
				1512	<li>Python binding fixes: makefiles (William), generator, rpm build, x86-64
				1513	(fcrozat)</li>
				1514	<li>HTML <style> and boolean attributes serializer fixes</li>
				1515	<li>C14N improvements by Aleksey</li>
Daniel Veillard	e166254	2002-08-28 11:50:59 +0000	[diff] [blame]	1516	<li>doc cleanups: Rick Jones</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	1517	<li>Windows compiler makefile updates: Igor and Elizabeth Barham</li>
				1518	<li>XInclude: implementation of fallback and xml:base fixup added</li>
				1519	</ul>
				1520
Daniel Veillard	782afda	2002-07-08 15:12:49 +0000	[diff] [blame]	1521	<h3>2.4.23: July 6 2002</h3>
				1522	<ul>
				1523	<li>performances patches: Peter Jacobi</li>
				1524	<li>c14n fixes, testsuite and performances: Aleksey Sanin</li>
				1525	<li>added xmlDocFormatDump: Chema Celorio</li>
				1526	<li>new tutorial: John Fleck</li>
				1527	<li>new hash functions and performances: Sander Vesik, portability fix from
				1528	Peter Jacobi</li>
				1529	<li>a number of bug fixes: XPath (William Brack, Richard Jinks), XML and
				1530	HTML parsers, ID lookup function</li>
				1531	<li>removal of all remaining sprintf: Aleksey Sanin</li>
				1532	</ul>
				1533
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1534	<h3>2.4.22: May 27 2002</h3>
				1535	<ul>
				1536	<li>a number of bug fixes: configure scripts, base handling, parser, memory
				1537	usage, HTML parser, XPath, documentation (Christian Cornelssen),
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	1538	indentation, URI parsing</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1539	<li>Optimizations for XMLSec, fixing and making public some of the network
				1540	protocol handlers (Aleksey)</li>
				1541	<li>performance patch from Gary Pennington</li>
				1542	<li>Charles Bozeman provided date and time support for XML Schemas
				1543	datatypes</li>
				1544	</ul>
				1545
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	1546	<h3>2.4.21: Apr 29 2002</h3>
				1547
				1548	<p>This release is both a bug fix release and also contains the early XML
				1549	Schemas <a href="http://www.w3.org/TR/xmlschema-1/">structures</a> and <a
				1550	href="http://www.w3.org/TR/xmlschema-2/">datatypes</a> code, beware, all
				1551	interfaces are likely to change, there is huge holes, it is clearly a work in
				1552	progress and don't even think of putting this code in a production system,
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	1553	it's actually not compiled in by default. The real fixes are:</p>
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	1554	<ul>
				1555	<li>a couple of bugs or limitations introduced in 2.4.20</li>
				1556	<li>patches for Borland C++ and MSC by Igor</li>
				1557	<li>some fixes on XPath strings and conformance patches by Richard
				1558	Jinks</li>
				1559	<li>patch from Aleksey for the ExcC14N specification</li>
				1560	<li>OSF/1 bug fix by Bjorn</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1561	</ul>
				1562
Daniel Veillard	a7084cd	2002-04-15 17:12:47 +0000	[diff] [blame]	1563	<h3>2.4.20: Apr 15 2002</h3>
				1564	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1565	<li>bug fixes: file descriptor leak, XPath, HTML output, DTD validation</li>
Daniel Veillard	a7084cd	2002-04-15 17:12:47 +0000	[diff] [blame]	1566	<li>XPath conformance testing by Richard Jinks</li>
				1567	<li>Portability fixes: Solaris, MPE/iX, Windows, OSF/1, python bindings,
				1568	libxml.m4</li>
				1569	</ul>
				1570
Daniel Veillard	1927409	2002-03-25 16:48:03 +0000	[diff] [blame]	1571	<h3>2.4.19: Mar 25 2002</h3>
				1572	<ul>
				1573	<li>bug fixes: half a dozen XPath bugs, Validation, ISO-Latin to UTF8
				1574	encoder</li>
				1575	<li>portability fixes in the HTTP code</li>
Daniel Veillard	b2fb8ed	2002-04-01 09:33:12 +0000	[diff] [blame]	1576	<li>memory allocation checks using valgrind, and profiling tests</li>
Daniel Veillard	1927409	2002-03-25 16:48:03 +0000	[diff] [blame]	1577	<li>revamp of the Windows build and Makefiles</li>
				1578	</ul>
				1579
Daniel Veillard	34ce8be	2002-03-18 19:37:11 +0000	[diff] [blame]	1580	<h3>2.4.18: Mar 18 2002</h3>
				1581	<ul>
				1582	<li>bug fixes: tree, SAX, canonicalization, validation, portability,
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1583	XPath</li>
Daniel Veillard	34ce8be	2002-03-18 19:37:11 +0000	[diff] [blame]	1584	<li>removed the --with-buffer option it was becoming unmaintainable</li>
				1585	<li>serious cleanup of the Python makefiles</li>
				1586	<li>speedup patch to XPath very effective for DocBook stylesheets</li>
				1587	<li>Fixes for Windows build, cleanup of the documentation</li>
				1588	</ul>
				1589
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1590	<h3>2.4.17: Mar 8 2002</h3>
				1591	<ul>
				1592	<li>a lot of bug fixes, including "namespace nodes have no parents in
				1593	XPath"</li>
				1594	<li>fixed/improved the Python wrappers, added more examples and more
				1595	regression tests, XPath extension functions can now return node-sets</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1596	<li>added the XML Canonicalization support from Aleksey Sanin</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1597	</ul>
				1598
Daniel Veillard	5f4b599	2002-02-20 10:22:49 +0000	[diff] [blame]	1599	<h3>2.4.16: Feb 20 2002</h3>
				1600	<ul>
				1601	<li>a lot of bug fixes, most of them were triggered by the XML Testsuite
				1602	from OASIS and W3C. Compliance has been significantly improved.</li>
				1603	<li>a couple of portability fixes too.</li>
				1604	</ul>
				1605
Daniel Veillard	397ff11	2002-02-11 18:27:20 +0000	[diff] [blame]	1606	<h3>2.4.15: Feb 11 2002</h3>
				1607	<ul>
				1608	<li>Fixed the Makefiles, especially the python module ones</li>
				1609	<li>A few bug fixes and cleanup</li>
				1610	<li>Includes cleanup</li>
				1611	</ul>
				1612
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	1613	<h3>2.4.14: Feb 8 2002</h3>
				1614	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1615	<li>Change of License to the <a
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	1616	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1617	License</a> basically for integration in XFree86 codebase, and removing
				1618	confusion around the previous dual-licensing</li>
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	1619	<li>added Python bindings, beta software but should already be quite
				1620	complete</li>
				1621	<li>a large number of fixes and cleanups, especially for all tree
				1622	manipulations</li>
				1623	<li>cleanup of the headers, generation of a reference API definition in
				1624	XML</li>
				1625	</ul>
				1626
				1627	<h3>2.4.13: Jan 14 2002</h3>
Daniel Veillard	744683d	2002-01-14 17:30:20 +0000	[diff] [blame]	1628	<ul>
				1629	<li>update of the documentation: John Fleck and Charlie Bozeman</li>
				1630	<li>cleanup of timing code from Justin Fletcher</li>
				1631	<li>fixes for Windows and initial thread support on Win32: Igor and Serguei
				1632	Narojnyi</li>
				1633	<li>Cygwin patch from Robert Collins</li>
				1634	<li>added xmlSetEntityReferenceFunc() for Keith Isdale work on xsldbg</li>
				1635	</ul>
				1636
Daniel Veillard	ef90ba7	2001-12-07 14:24:22 +0000	[diff] [blame]	1637	<h3>2.4.12: Dec 7 2001</h3>
				1638	<ul>
				1639	<li>a few bug fixes: thread (Gary Pennington), xmllint (Geert Kloosterman),
				1640	XML parser (Robin Berjon), XPointer (Danny Jamshy), I/O cleanups
				1641	(robert)</li>
				1642	<li>Eric Lavigne contributed project files for MacOS</li>
				1643	<li>some makefiles cleanups</li>
				1644	</ul>
				1645
Daniel Veillard	a487105	2001-11-26 13:19:48 +0000	[diff] [blame]	1646	<h3>2.4.11: Nov 26 2001</h3>
				1647	<ul>
				1648	<li>fixed a couple of errors in the includes, fixed a few bugs, some code
				1649	cleanups</li>
				1650	<li>xmllint man pages improvement by Heiko Rupp</li>
				1651	<li>updated VMS build instructions from John A Fotheringham</li>
				1652	<li>Windows Makefiles updates from Igor</li>
				1653	</ul>
				1654
Daniel Veillard	43d3f61	2001-11-10 11:57:23 +0000	[diff] [blame]	1655	<h3>2.4.10: Nov 10 2001</h3>
				1656	<ul>
				1657	<li>URI escaping fix (Joel Young)</li>
				1658	<li>added xmlGetNodePath() (for paths or XPointers generation)</li>
				1659	<li>Fixes namespace handling problems when using DTD and validation</li>
				1660	<li>improvements on xmllint: Morus Walter patches for --format and
				1661	--encode, Stefan Kost and Heiko Rupp improvements on the --shell</li>
				1662	<li>fixes for xmlcatalog linking pointed by Weiqi Gao</li>
				1663	<li>fixes to the HTML parser</li>
				1664	</ul>
				1665
				1666	<h3>2.4.9: Nov 6 2001</h3>
				1667	<ul>
				1668	<li>fixes more catalog bugs</li>
				1669	<li>avoid a compilation problem, improve xmlGetLineNo()</li>
				1670	</ul>
				1671
Daniel Veillard	ed421aa	2001-11-04 21:22:45 +0000	[diff] [blame]	1672	<h3>2.4.8: Nov 4 2001</h3>
				1673	<ul>
				1674	<li>fixed SGML catalogs broken in previous release, updated xmlcatalog
				1675	tool</li>
				1676	<li>fixed a compile errors and some includes troubles.</li>
				1677	</ul>
				1678
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	1679	<h3>2.4.7: Oct 30 2001</h3>
				1680	<ul>
				1681	<li>exported some debugging interfaces</li>
				1682	<li>serious rewrite of the catalog code</li>
				1683	<li>integrated Gary Pennington thread safety patch, added configure option
				1684	and regression tests</li>
				1685	<li>removed an HTML parser bug</li>
				1686	<li>fixed a couple of potentially serious validation bugs</li>
				1687	<li>integrated the SGML DocBook support in xmllint</li>
				1688	<li>changed the nanoftp anonymous login passwd</li>
				1689	<li>some I/O cleanup and a couple of interfaces for Perl wrapper</li>
				1690	<li>general bug fixes</li>
				1691	<li>updated xmllint man page by John Fleck</li>
				1692	<li>some VMS and Windows updates</li>
				1693	</ul>
				1694
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1695	<h3>2.4.6: Oct 10 2001</h3>
				1696	<ul>
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	1697	<li>added an updated man pages by John Fleck</li>
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1698	<li>portability and configure fixes</li>
				1699	<li>an infinite loop on the HTML parser was removed (William)</li>
				1700	<li>Windows makefile patches from Igor</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1701	<li>fixed half a dozen bugs reported for libxml or libxslt</li>
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1702	<li>updated xmlcatalog to be able to modify SGML super catalogs</li>
				1703	</ul>
				1704
Daniel Veillard	dadd087	2001-09-15 09:21:44 +0000	[diff] [blame]	1705	<h3>2.4.5: Sep 14 2001</h3>
				1706	<ul>
				1707	<li>Remove a few annoying bugs in 2.4.4</li>
				1708	<li>forces the HTML serializer to output decimal charrefs since some
				1709	version of Netscape can't handle hexadecimal ones</li>
				1710	</ul>
				1711
				1712	<h3>1.8.16: Sep 14 2001</h3>
				1713	<ul>
				1714	<li>maintenance release of the old libxml1 branch, couple of bug and
				1715	portability fixes</li>
				1716	</ul>
				1717
Daniel Veillard	04382ae	2001-09-12 18:51:30 +0000	[diff] [blame]	1718	<h3>2.4.4: Sep 12 2001</h3>
				1719	<ul>
				1720	<li>added --convert to xmlcatalog, bug fixes and cleanups of XML
				1721	Catalog</li>
				1722	<li>a few bug fixes and some portability changes</li>
				1723	<li>some documentation cleanups</li>
				1724	</ul>
				1725
Daniel Veillard	3993690	2001-08-24 00:49:01 +0000	[diff] [blame]	1726	<h3>2.4.3: Aug 23 2001</h3>
				1727	<ul>
				1728	<li>XML Catalog support see the doc</li>
				1729	<li>New NaN/Infinity floating point code</li>
				1730	<li>A few bug fixes</li>
				1731	</ul>
				1732
				1733	<h3>2.4.2: Aug 15 2001</h3>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1734	<ul>
				1735	<li>adds xmlLineNumbersDefault() to control line number generation</li>
				1736	<li>lot of bug fixes</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1737	<li>the Microsoft MSC projects files should now be up to date</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1738	<li>inheritance of namespaces from DTD defaulted attributes</li>
				1739	<li>fixes a serious potential security bug</li>
				1740	<li>added a --format option to xmllint</li>
				1741	</ul>
				1742
				1743	<h3>2.4.1: July 24 2001</h3>
				1744	<ul>
				1745	<li>possibility to keep line numbers in the tree</li>
				1746	<li>some computation NaN fixes</li>
				1747	<li>extension of the XPath API</li>
				1748	<li>cleanup for alpha and ia64 targets</li>
				1749	<li>patch to allow saving through HTTP PUT or POST</li>
Daniel Veillard	09ab7e1	2001-07-10 15:49:44 +0000	[diff] [blame]	1750	</ul>
				1751
				1752	<h3>2.4.0: July 10 2001</h3>
				1753	<ul>
				1754	<li>Fixed a few bugs in XPath, validation, and tree handling.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1755	<li>Fixed XML Base implementation, added a couple of examples to the
Daniel Veillard	09ab7e1	2001-07-10 15:49:44 +0000	[diff] [blame]	1756	regression tests</li>
				1757	<li>A bit of cleanup</li>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	1758	</ul>
				1759
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1760	<h3>2.3.14: July 5 2001</h3>
				1761	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1762	<li>fixed some entities problems and reduce memory requirement when
				1763	substituting them</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1764	<li>lots of improvements in the XPath queries interpreter can be
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1765	substantially faster</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1766	<li>Makefiles and configure cleanups</li>
				1767	<li>Fixes to XPath variable eval, and compare on empty node set</li>
				1768	<li>HTML tag closing bug fixed</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1769	<li>Fixed an URI reference computation problem when validating</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1770	</ul>
				1771
Daniel Veillard	2adbb51	2001-06-28 16:20:36 +0000	[diff] [blame]	1772	<h3>2.3.13: June 28 2001</h3>
				1773	<ul>
				1774	<li>2.3.12 configure.in was broken as well as the push mode XML parser</li>
				1775	<li>a few more fixes for compilation on Windows MSC by Yon Derek</li>
				1776	</ul>
				1777
				1778	<h3>1.8.14: June 28 2001</h3>
				1779	<ul>
				1780	<li>Zbigniew Chyla gave a patch to use the old XML parser in push mode</li>
				1781	<li>Small Makefile fix</li>
				1782	</ul>
				1783
Daniel Veillard	1164810	2001-06-26 16:08:24 +0000	[diff] [blame]	1784	<h3>2.3.12: June 26 2001</h3>
				1785	<ul>
				1786	<li>lots of cleanup</li>
				1787	<li>a couple of validation fix</li>
				1788	<li>fixed line number counting</li>
				1789	<li>fixed serious problems in the XInclude processing</li>
				1790	<li>added support for UTF8 BOM at beginning of entities</li>
				1791	<li>fixed a strange gcc optimizer bugs in xpath handling of float, gcc-3.0
				1792	miscompile uri.c (William), Thomas Leitner provided a fix for the
				1793	optimizer on Tru64</li>
				1794	<li>incorporated Yon Derek and Igor Zlatkovic fixes and improvements for
				1795	compilation on Windows MSC</li>
				1796	<li>update of libxml-doc.el (Felix Natter)</li>
				1797	<li>fixed 2 bugs in URI normalization code</li>
				1798	</ul>
				1799
Daniel Veillard	e3c81b5	2001-06-17 14:50:34 +0000	[diff] [blame]	1800	<h3>2.3.11: June 17 2001</h3>
				1801	<ul>
				1802	<li>updates to trio, Makefiles and configure should fix some portability
				1803	problems (alpha)</li>
				1804	<li>fixed some HTML serialization problems (pre, script, and block/inline
				1805	handling), added encoding aware APIs, cleanup of this code</li>
				1806	<li>added xmlHasNsProp()</li>
				1807	<li>implemented a specific PI for encoding support in the DocBook SGML
				1808	parser</li>
				1809	<li>some XPath fixes (-Infinity, / as a function parameter and namespaces
				1810	node selection)</li>
				1811	<li>fixed a performance problem and an error in the validation code</li>
				1812	<li>fixed XInclude routine to implement the recursive behaviour</li>
				1813	<li>fixed xmlFreeNode problem when libxml is included statically twice</li>
				1814	<li>added --version to xmllint for bug reports</li>
				1815	</ul>
				1816
Daniel Veillard	2e4f188	2001-06-01 10:11:57 +0000	[diff] [blame]	1817	<h3>2.3.10: June 1 2001</h3>
				1818	<ul>
				1819	<li>fixed the SGML catalog support</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1820	<li>a number of reported bugs got fixed, in XPath, iconv detection,
				1821	XInclude processing</li>
Daniel Veillard	2e4f188	2001-06-01 10:11:57 +0000	[diff] [blame]	1822	<li>XPath string function should now handle unicode correctly</li>
				1823	</ul>
				1824
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1825	<h3>2.3.9: May 19 2001</h3>
				1826
				1827	<p>Lots of bugfixes, and added a basic SGML catalog support:</p>
				1828	<ul>
				1829	<li>HTML push bugfix #54891 and another patch from Jonas Borgström</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1830	<li>some serious speed optimization again</li>
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1831	<li>some documentation cleanups</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1832	<li>trying to get better linking on Solaris (-R)</li>
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1833	<li>XPath API cleanup from Thomas Broyer</li>
				1834	<li>Validation bug fixed #54631, added a patch from Gary Pennington, fixed
				1835	xmlValidGetValidElements()</li>
				1836	<li>Added an INSTALL file</li>
				1837	<li>Attribute removal added to API: #54433</li>
				1838	<li>added a basic support for SGML catalogs</li>
				1839	<li>fixed xmlKeepBlanksDefault(0) API</li>
				1840	<li>bugfix in xmlNodeGetLang()</li>
				1841	<li>fixed a small configure portability problem</li>
				1842	<li>fixed an inversion of SYSTEM and PUBLIC identifier in HTML document</li>
				1843	</ul>
				1844
Daniel Veillard	a265af7	2001-05-14 11:13:58 +0000	[diff] [blame]	1845	<h3>1.8.13: May 14 2001</h3>
				1846	<ul>
				1847	<li>bugfixes release of the old libxml1 branch used by Gnome</li>
				1848	</ul>
				1849
Daniel Veillard	3bbbe6f	2001-05-03 11:15:37 +0000	[diff] [blame]	1850	<h3>2.3.8: May 3 2001</h3>
				1851	<ul>
				1852	<li>Integrated an SGML DocBook parser for the Gnome project</li>
				1853	<li>Fixed a few things in the HTML parser</li>
				1854	<li>Fixed some XPath bugs raised by XSLT use, tried to fix the floating
				1855	point portability issue</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1856	<li>Speed improvement (8M/s for SAX, 3M/s for DOM, 1.5M/s for
				1857	DOM+validation using the XML REC as input and a 700MHz celeron).</li>
Daniel Veillard	3bbbe6f	2001-05-03 11:15:37 +0000	[diff] [blame]	1858	<li>incorporated more Windows cleanup</li>
				1859	<li>added xmlSaveFormatFile()</li>
				1860	<li>fixed problems in copying nodes with entities references (gdome)</li>
				1861	<li>removed some troubles surrounding the new validation module</li>
				1862	</ul>
				1863
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1864	<h3>2.3.7: April 22 2001</h3>
				1865	<ul>
				1866	<li>lots of small bug fixes, corrected XPointer</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1867	<li>Non deterministic content model validation support</li>
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1868	<li>added xmlDocCopyNode for gdome2</li>
				1869	<li>revamped the way the HTML parser handles end of tags</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1870	<li>XPath: corrections of namespaces support and number formatting</li>
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1871	<li>Windows: Igor Zlatkovic patches for MSC compilation</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1872	<li>HTML output fixes from P C Chow and William M. Brack</li>
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1873	<li>Improved validation speed sensible for DocBook</li>
				1874	<li>fixed a big bug with ID declared in external parsed entities</li>
				1875	<li>portability fixes, update of Trio from Bjorn Reese</li>
				1876	</ul>
				1877
Daniel Veillard	afc7311	2001-04-11 11:51:41 +0000	[diff] [blame]	1878	<h3>2.3.6: April 8 2001</h3>
				1879	<ul>
				1880	<li>Code cleanup using extreme gcc compiler warning options, found and
				1881	cleared half a dozen potential problem</li>
				1882	<li>the Eazel team found an XML parser bug</li>
				1883	<li>cleaned up the user of some of the string formatting function. used the
				1884	trio library code to provide the one needed when the platform is missing
				1885	them</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1886	<li>xpath: removed a memory leak and fixed the predicate evaluation
				1887	problem, extended the testsuite and cleaned up the result. XPointer seems
				1888	broken ...</li>
Daniel Veillard	afc7311	2001-04-11 11:51:41 +0000	[diff] [blame]	1889	</ul>
				1890
Daniel Veillard	56a4cb8	2001-03-24 17:00:36 +0000	[diff] [blame]	1891	<h3>2.3.5: Mar 23 2001</h3>
				1892	<ul>
				1893	<li>Biggest change is separate parsing and evaluation of XPath expressions,
				1894	there is some new APIs for this too</li>
				1895	<li>included a number of bug fixes(XML push parser, 51876, notations,
				1896	52299)</li>
				1897	<li>Fixed some portability issues</li>
				1898	</ul>
				1899
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	1900	<h3>2.3.4: Mar 10 2001</h3>
				1901	<ul>
				1902	<li>Fixed bugs #51860 and #51861</li>
				1903	<li>Added a global variable xmlDefaultBufferSize to allow default buffer
				1904	size to be application tunable.</li>
				1905	<li>Some cleanup in the validation code, still a bug left and this part
				1906	should probably be rewritten to support ambiguous content model :-\</li>
				1907	<li>Fix a couple of serious bugs introduced or raised by changes in 2.3.3
				1908	parser</li>
				1909	<li>Fixed another bug in xmlNodeGetContent()</li>
				1910	<li>Bjorn fixed XPath node collection and Number formatting</li>
				1911	<li>Fixed a loop reported in the HTML parsing</li>
				1912	<li>blank space are reported even if the Dtd content model proves that they
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1913	are formatting spaces, this is for XML conformance</li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	1914	</ul>
				1915
Daniel Veillard	b402c07	2001-03-01 17:28:58 +0000	[diff] [blame]	1916	<h3>2.3.3: Mar 1 2001</h3>
				1917	<ul>
				1918	<li>small change in XPath for XSLT</li>
				1919	<li>documentation cleanups</li>
				1920	<li>fix in validation by Gary Pennington</li>
				1921	<li>serious parsing performances improvements</li>
				1922	</ul>
				1923
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1924	<h3>2.3.2: Feb 24 2001</h3>
Daniel Veillard	7168110	2001-02-24 17:48:53 +0000	[diff] [blame]	1925	<ul>
				1926	<li>chasing XPath bugs, found a bunch, completed some TODO</li>
				1927	<li>fixed a Dtd parsing bug</li>
				1928	<li>fixed a bug in xmlNodeGetContent</li>
				1929	<li>ID/IDREF support partly rewritten by Gary Pennington</li>
				1930	</ul>
				1931
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1932	<h3>2.3.1: Feb 15 2001</h3>
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1933	<ul>
				1934	<li>some XPath and HTML bug fixes for XSLT</li>
				1935	<li>small extension of the hash table interfaces for DOM gdome2
				1936	implementation</li>
				1937	<li>A few bug fixes</li>
				1938	</ul>
				1939
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1940	<h3>2.3.0: Feb 8 2001 (2.2.12 was on 25 Jan but I didn't kept track)</h3>
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1941	<ul>
				1942	<li>Lots of XPath bug fixes</li>
				1943	<li>Add a mode with Dtd lookup but without validation error reporting for
				1944	XSLT</li>
				1945	<li>Add support for text node without escaping (XSLT)</li>
				1946	<li>bug fixes for xmlCheckFilename</li>
				1947	<li>validation code bug fixes from Gary Pennington</li>
				1948	<li>Patch from Paul D. Smith correcting URI path normalization</li>
				1949	<li>Patch to allow simultaneous install of libxml-devel and
				1950	libxml2-devel</li>
				1951	<li>the example Makefile is now fixed</li>
				1952	<li>added HTML to the RPM packages</li>
				1953	<li>tree copying bugfixes</li>
				1954	<li>updates to Windows makefiles</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1955	<li>optimization patch from Bjorn Reese</li>
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1956	</ul>
				1957
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1958	<h3>2.2.11: Jan 4 2001</h3>
Daniel Veillard	503b893	2001-01-05 06:36:31 +0000	[diff] [blame]	1959	<ul>
				1960	<li>bunch of bug fixes (memory I/O, xpath, ftp/http, ...)</li>
				1961	<li>added htmlHandleOmittedElem()</li>
				1962	<li>Applied Bjorn Reese's IPV6 first patch</li>
				1963	<li>Applied Paul D. Smith patches for validation of XInclude results</li>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	1964	<li>added XPointer xmlns() new scheme support</li>
Daniel Veillard	503b893	2001-01-05 06:36:31 +0000	[diff] [blame]	1965	</ul>
				1966
Daniel Veillard	2ddd23d	2000-11-25 10:42:19 +0000	[diff] [blame]	1967	<h3>2.2.10: Nov 25 2000</h3>
Daniel Veillard	9d343c4	2000-11-25 10:12:43 +0000	[diff] [blame]	1968	<ul>
				1969	<li>Fix the Windows problems of 2.2.8</li>
				1970	<li>integrate OpenVMS patches</li>
				1971	<li>better handling of some nasty HTML input</li>
				1972	<li>Improved the XPointer implementation</li>
				1973	<li>integrate a number of provided patches</li>
				1974	</ul>
				1975
Daniel Veillard	2ddd23d	2000-11-25 10:42:19 +0000	[diff] [blame]	1976	<h3>2.2.9: Nov 25 2000</h3>
				1977	<ul>
				1978	<li>erroneous release :-(</li>
				1979	</ul>
				1980
Daniel Veillard	28929b2	2000-11-13 18:22:49 +0000	[diff] [blame]	1981	<h3>2.2.8: Nov 13 2000</h3>
				1982	<ul>
				1983	<li>First version of <a href="http://www.w3.org/TR/xinclude">XInclude</a>
				1984	support</li>
				1985	<li>Patch in conditional section handling</li>
				1986	<li>updated MS compiler project</li>
				1987	<li>fixed some XPath problems</li>
				1988	<li>added an URI escaping function</li>
				1989	<li>some other bug fixes</li>
				1990	</ul>
				1991
				1992	<h3>2.2.7: Oct 31 2000</h3>
				1993	<ul>
				1994	<li>added message redirection</li>
				1995	<li>XPath improvements (thanks TOM !)</li>
				1996	<li>xmlIOParseDTD() added</li>
				1997	<li>various small fixes in the HTML, URI, HTTP and XPointer support</li>
				1998	<li>some cleanup of the Makefile, autoconf and the distribution content</li>
				1999	</ul>
				2000
Daniel Veillard	29a11cc	2000-10-25 13:32:39 +0000	[diff] [blame]	2001	<h3>2.2.6: Oct 25 2000:</h3>
				2002	<ul>
				2003	<li>Added an hash table module, migrated a number of internal structure to
				2004	those</li>
				2005	<li>Fixed a posteriori validation problems</li>
				2006	<li>HTTP module cleanups</li>
				2007	<li>HTML parser improvements (tag errors, script/style handling, attribute
				2008	normalization)</li>
				2009	<li>coalescing of adjacent text nodes</li>
				2010	<li>couple of XPath bug fixes, exported the internal API</li>
				2011	</ul>
				2012
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	2013	<h3>2.2.5: Oct 15 2000:</h3>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	2014	<ul>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	2015	<li>XPointer implementation and testsuite</li>
				2016	<li>Lot of XPath fixes, added variable and functions registration, more
				2017	tests</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2018	<li>Portability fixes, lots of enhancements toward an easy Windows build
				2019	and release</li>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	2020	<li>Late validation fixes</li>
				2021	<li>Integrated a lot of contributed patches</li>
				2022	<li>added memory management docs</li>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	2023	<li>a performance problem when using large buffer seems fixed</li>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	2024	</ul>
				2025
				2026	<h3>2.2.4: Oct 1 2000:</h3>
				2027	<ul>
				2028	<li>main XPath problem fixed</li>
				2029	<li>Integrated portability patches for Windows</li>
				2030	<li>Serious bug fixes on the URI and HTML code</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2031	</ul>
				2032
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	2033	<h3>2.2.3: Sep 17 2000</h3>
				2034	<ul>
				2035	<li>bug fixes</li>
				2036	<li>cleanup of entity handling code</li>
				2037	<li>overall review of all loops in the parsers, all sprintf usage has been
				2038	checked too</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2039	<li>Far better handling of larges Dtd. Validating against DocBook XML Dtd
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	2040	works smoothly now.</li>
				2041	</ul>
				2042
				2043	<h3>1.8.10: Sep 6 2000</h3>
				2044	<ul>
				2045	<li>bug fix release for some Gnome projects</li>
				2046	</ul>
				2047
				2048	<h3>2.2.2: August 12 2000</h3>
Daniel Veillard	786d7c8	2000-08-12 23:38:57 +0000	[diff] [blame]	2049	<ul>
				2050	<li>mostly bug fixes</li>
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	2051	<li>started adding routines to access xml parser context options</li>
Daniel Veillard	786d7c8	2000-08-12 23:38:57 +0000	[diff] [blame]	2052	</ul>
				2053
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	2054	<h3>2.2.1: July 21 2000</h3>
Daniel Veillard	a2679fa	2000-07-22 02:38:15 +0000	[diff] [blame]	2055	<ul>
				2056	<li>a purely bug fixes release</li>
				2057	<li>fixed an encoding support problem when parsing from a memory block</li>
				2058	<li>fixed a DOCTYPE parsing problem</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2059	<li>removed a bug in the function allowing to override the memory
				2060	allocation routines</li>
Daniel Veillard	a2679fa	2000-07-22 02:38:15 +0000	[diff] [blame]	2061	</ul>
				2062
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	2063	<h3>2.2.0: July 14 2000</h3>
Daniel Veillard	94e9060	2000-07-17 14:38:19 +0000	[diff] [blame]	2064	<ul>
				2065	<li>applied a lot of portability fixes</li>
				2066	<li>better encoding support/cleanup and saving (content is now always
				2067	encoded in UTF-8)</li>
				2068	<li>the HTML parser now correctly handles encodings</li>
				2069	<li>added xmlHasProp()</li>
				2070	<li>fixed a serious problem with &#38;</li>
				2071	<li>propagated the fix to FTP client</li>
				2072	<li>cleanup, bugfixes, etc ...</li>
				2073	<li>Added a page about <a href="encoding.html">libxml Internationalization
				2074	support</a></li>
				2075	</ul>
				2076
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	2077	<h3>1.8.9: July 9 2000</h3>
				2078	<ul>
				2079	<li>fixed the spec the RPMs should be better</li>
				2080	<li>fixed a serious bug in the FTP implementation, released 1.8.9 to solve
				2081	rpmfind users problem</li>
				2082	</ul>
				2083
Daniel Veillard	6388e17	2000-07-03 16:07:19 +0000	[diff] [blame]	2084	<h3>2.1.1: July 1 2000</h3>
				2085	<ul>
				2086	<li>fixes a couple of bugs in the 2.1.0 packaging</li>
				2087	<li>improvements on the HTML parser</li>
				2088	</ul>
				2089
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	2090	<h3>2.1.0 and 1.8.8: June 29 2000</h3>
				2091	<ul>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2092	<li>1.8.8 is mostly a commodity package for upgrading to libxml2 according
				2093	to <a href="upgrade.html">new instructions</a>. It fixes a nasty problem
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	2094	about &#38; charref parsing</li>
				2095	<li>2.1.0 also ease the upgrade from libxml v1 to the recent version. it
				2096	also contains numerous fixes and enhancements:
				2097	<ul>
				2098	<li>added xmlStopParser() to stop parsing</li>
				2099	<li>improved a lot parsing speed when there is large CDATA blocs</li>
				2100	<li>includes XPath patches provided by Picdar Technology</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2101	<li>tried to fix as much as possible DTD validation and namespace
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	2102	related problems</li>
				2103	<li>output to a given encoding has been added/tested</li>
				2104	<li>lot of various fixes</li>
				2105	</ul>
				2106	</li>
				2107	</ul>
				2108
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	2109	<h3>2.0.0: Apr 12 2000</h3>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2110	<ul>
				2111	<li>First public release of libxml2. If you are using libxml, it's a good
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2112	idea to check the 1.x to 2.x upgrade instructions. NOTE: while initially
				2113	scheduled for Apr 3 the release occurred only on Apr 12 due to massive
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	2114	workload.</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2115	<li>The include are now located under $prefix/include/libxml (instead of
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	2116	$prefix/include/gnome-xml), they also are referenced by
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	2117	<pre>#include <libxml/xxx.h></pre>
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	2118	<p>instead of</p>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2119	<pre>#include "xxx.h"</pre>
				2120	</li>
Daniel Veillard	8f62198	2000-03-20 13:07:15 +0000	[diff] [blame]	2121	<li>a new URI module for parsing URIs and following strictly RFC 2396</li>
				2122	<li>the memory allocation routines used by libxml can now be overloaded
				2123	dynamically by using xmlMemSetup()</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2124	<li>The previously CVS only tool tester has been renamed
				2125	<strong>xmllint</strong> and is now installed as part of the libxml2
				2126	package</li>
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	2127	<li>The I/O interface has been revamped. There is now ways to plug in
				2128	specific I/O modules, either at the URI scheme detection level using
				2129	xmlRegisterInputCallbacks() or by passing I/O functions when creating a
				2130	parser context using xmlCreateIOParserCtxt()</li>
				2131	<li>there is a C preprocessor macro LIBXML_VERSION providing the version
				2132	number of the libxml module in use</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2133	<li>a number of optional features of libxml can now be excluded at
				2134	configure time (FTP/HTTP/HTML/XPath/Debug)</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2135	</ul>
				2136
				2137	<h3>2.0.0beta: Mar 14 2000</h3>
				2138	<ul>
				2139	<li>This is a first Beta release of libxml version 2</li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	2140	<li>It's available only from<a href="ftp://xmlsoft.org/">xmlsoft.org
				2141	FTP</a>, it's packaged as libxml2-2.0.0beta and available as tar and
				2142	RPMs</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2143	<li>This version is now the head in the Gnome CVS base, the old one is
				2144	available under the tag LIB_XML_1_X</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2145	<li>This includes a very large set of changes. From a programmatic point
				2146	of view applications should not have to be modified too much, check the
				2147	<a href="upgrade.html">upgrade page</a></li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2148	<li>Some interfaces may changes (especially a bit about encoding).</li>
				2149	<li>the updates includes:
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	2150	<ul>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2151	<li>fix I18N support. ISO-Latin-x/UTF-8/UTF-16 (nearly) seems correctly
				2152	handled now</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2153	<li>Better handling of entities, especially well-formedness checking
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2154	and proper PEref extensions in external subsets</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	2155	<li>DTD conditional sections</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2156	<li>Validation now correctly handle entities content</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	2157	<li><a href="http://rpmfind.net/tools/gdome/messages/0039.html">change
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2158	structures to accommodate DOM</a></li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	2159	</ul>
				2160	</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2161	<li>Serious progress were made toward compliance, <a
				2162	href="conf/result.html">here are the result of the test</a> against the
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2163	OASIS testsuite (except the Japanese tests since I don't support that
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	2164	encoding yet). This URL is rebuilt every couple of hours using the CVS
				2165	head version.</li>
Daniel Veillard	e41f2b7	2000-01-30 20:00:07 +0000	[diff] [blame]	2166	</ul>
				2167
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2168	<h3>1.8.7: Mar 6 2000</h3>
				2169	<ul>
				2170	<li>This is a bug fix release:</li>
				2171	<li>It is possible to disable the ignorable blanks heuristic used by
				2172	libxml-1.x, a new function xmlKeepBlanksDefault(0) will allow this. Note
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2173	that for adherence to XML spec, this behaviour will be disabled by
				2174	default in 2.x . The same function will allow to keep compatibility for
				2175	old code.</li>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	2176	<li>Blanks in <a> </a> constructs are not ignored anymore,
				2177	avoiding heuristic is really the Right Way :-\</li>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2178	<li>The unchecked use of snprintf which was breaking libxml-1.8.6
				2179	compilation on some platforms has been fixed</li>
				2180	<li>nanoftp.c nanohttp.c: Fixed '#' and '?' stripping when processing
				2181	URIs</li>
				2182	</ul>
				2183
Daniel Veillard	e41f2b7	2000-01-30 20:00:07 +0000	[diff] [blame]	2184	<h3>1.8.6: Jan 31 2000</h3>
				2185	<ul>
				2186	<li>added a nanoFTP transport module, debugged until the new version of <a
				2187	href="http://rpmfind.net/linux/rpm2html/rpmfind.html">rpmfind</a> can use
				2188	it without troubles</li>
Daniel Veillard	da07c34	2000-01-25 18:31:22 +0000	[diff] [blame]	2189	</ul>
				2190
				2191	<h3>1.8.5: Jan 21 2000</h3>
				2192	<ul>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	2193	<li>adding APIs to parse a well balanced chunk of XML (production <a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2194	href="http://www.w3.org/TR/REC-xml#NT-content">[43] content</a> of the
				2195	XML spec)</li>
Daniel Veillard	461a66c	2000-01-18 18:01:01 +0000	[diff] [blame]	2196	<li>fixed a hideous bug in xmlGetProp pointed by Rune.Djurhuus@fast.no</li>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	2197	<li>Jody Goldberg <jgoldberg@home.com> provided another patch trying
				2198	to solve the zlib checks problems</li>
Daniel Veillard	461a66c	2000-01-18 18:01:01 +0000	[diff] [blame]	2199	<li>The current state in gnome CVS base is expected to ship as 1.8.5 with
				2200	gnumeric soon</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	2201	</ul>
				2202
				2203	<h3>1.8.4: Jan 13 2000</h3>
				2204	<ul>
				2205	<li>bug fixes, reintroduced xmlNewGlobalNs(), fixed xmlNewNs()</li>
				2206	<li>all exit() call should have been removed from libxml</li>
				2207	<li>fixed a problem with INCLUDE_WINSOCK on WIN32 platform</li>
				2208	<li>added newDocFragment()</li>
Daniel Veillard	f84f71f	2000-01-05 19:54:23 +0000	[diff] [blame]	2209	</ul>
				2210
				2211	<h3>1.8.3: Jan 5 2000</h3>
				2212	<ul>
				2213	<li>a Push interface for the XML and HTML parsers</li>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2214	<li>a shell-like interface to the document tree (try tester --shell :-)</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2215	<li>lots of bug fixes and improvement added over XMas holidays</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	2216	<li>fixed the DTD parsing code to work with the xhtml DTD</li>
Daniel Veillard	f84f71f	2000-01-05 19:54:23 +0000	[diff] [blame]	2217	<li>added xmlRemoveProp(), xmlRemoveID() and xmlRemoveRef()</li>
				2218	<li>Fixed bugs in xmlNewNs()</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	2219	<li>External entity loading code has been revamped, now it uses
Daniel Veillard	f84f71f	2000-01-05 19:54:23 +0000	[diff] [blame]	2220	xmlLoadExternalEntity(), some fix on entities processing were added</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	2221	<li>cleaned up WIN32 includes of socket stuff</li>
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	2222	</ul>
				2223
				2224	<h3>1.8.2: Dec 21 1999</h3>
				2225	<ul>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	2226	<li>I got another problem with includes and C++, I hope this issue is fixed
				2227	for good this time</li>
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	2228	<li>Added a few tree modification functions: xmlReplaceNode,
				2229	xmlAddPrevSibling, xmlAddNextSibling, xmlNodeSetName and
				2230	xmlDocSetRootElement</li>
				2231	<li>Tried to improve the HTML output with help from <a
				2232	href="mailto:clahey@umich.edu">Chris Lahey</a></li>
Daniel Veillard	e4e5131	1999-12-18 15:32:46 +0000	[diff] [blame]	2233	</ul>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	2234
Daniel Veillard	e4e5131	1999-12-18 15:32:46 +0000	[diff] [blame]	2235	<h3>1.8.1: Dec 18 1999</h3>
				2236	<ul>
				2237	<li>various patches to avoid troubles when using libxml with C++ compilers
				2238	the "namespace" keyword and C escaping in include files</li>
				2239	<li>a problem in one of the core macros IS_CHAR was corrected</li>
				2240	<li>fixed a bug introduced in 1.8.0 breaking default namespace processing,
				2241	and more specifically the Dia application</li>
Daniel Veillard	944b5ff	1999-12-15 19:08:24 +0000	[diff] [blame]	2242	<li>fixed a posteriori validation (validation after parsing, or by using a
				2243	Dtd not specified in the original document)</li>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	2244	<li>fixed a bug in</li>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	2245	</ul>
				2246
				2247	<h3>1.8.0: Dec 12 1999</h3>
				2248	<ul>
				2249	<li>cleanup, especially memory wise</li>
				2250	<li>the parser should be more reliable, especially the HTML one, it should
				2251	not crash, whatever the input !</li>
				2252	<li>Integrated various patches, especially a speedup improvement for large
				2253	dataset from <a href="mailto:cnygard@bellatlantic.net">Carl Nygard</a>,
				2254	configure with --with-buffers to enable them.</li>
				2255	<li>attribute normalization, oops should have been added long ago !</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2256	<li>attributes defaulted from DTDs should be available, xmlSetProp() now
				2257	does entities escaping by default.</li>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	2258	</ul>
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	2259
				2260	<h3>1.7.4: Oct 25 1999</h3>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2261	<ul>
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	2262	<li>Lots of HTML improvement</li>
				2263	<li>Fixed some errors when saving both XML and HTML</li>
				2264	<li>More examples, the regression tests should now look clean</li>
				2265	<li>Fixed a bug with contiguous charref</li>
				2266	</ul>
				2267
				2268	<h3>1.7.3: Sep 29 1999</h3>
				2269	<ul>
				2270	<li>portability problems fixed</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2271	<li>snprintf was used unconditionally, leading to link problems on system
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	2272	were it's not available, fixed</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2273	</ul>
				2274
				2275	<h3>1.7.1: Sep 24 1999</h3>
				2276	<ul>
				2277	<li>The basic type for strings manipulated by libxml has been renamed in
				2278	1.7.1 from <strong>CHAR</strong> to <strong>xmlChar</strong>. The reason
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2279	is that CHAR was conflicting with a predefined type on Windows. However
				2280	on non WIN32 environment, compatibility is provided by the way of a
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2281	<strong>#define </strong>.</li>
				2282	<li>Changed another error : the use of a structure field called errno, and
				2283	leading to troubles on platforms where it's a macro</li>
				2284	</ul>
				2285
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2286	<h3>1.7.0: Sep 23 1999</h3>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2287	<ul>
				2288	<li>Added the ability to fetch remote DTD or parsed entities, see the <a
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	2289	href="html/libxml-nanohttp.html">nanohttp</a> module.</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2290	<li>Added an errno to report errors by another mean than a simple printf
				2291	like callback</li>
				2292	<li>Finished ID/IDREF support and checking when validation</li>
				2293	<li>Serious memory leaks fixed (there is now a <a
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	2294	href="html/libxml-xmlmemory.html">memory wrapper</a> module)</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2295	<li>Improvement of <a href="http://www.w3.org/TR/xpath">XPath</a>
				2296	implementation</li>
				2297	<li>Added an HTML parser front-end</li>
				2298	</ul>
				2299
				2300	<h2><a name="XML">XML</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2301
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2302	<p><a href="http://www.w3.org/TR/REC-xml">XML is a standard</a> for
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2303	markup-based structured documents. Here is <a name="example">an example XML
				2304	document</a>:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	2305	<pre><?xml version="1.0"?>
				2306	<EXAMPLE prop1="gnome is great" prop2="&amp; linux too">
				2307	<head>
				2308	<title>Welcome to Gnome</title>
				2309	</head>
				2310	<chapter>
				2311	<title>The Linux adventure</title>
				2312	<p>bla bla bla ...</p>
				2313	<image href="linus.gif"/>
				2314	<p>...</p>
				2315	</chapter>
				2316	</EXAMPLE></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2317
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2318	<p>The first line specifies that it is an XML document and gives useful
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2319	information about its encoding. Then the rest of the document is a text
				2320	format whose structure is specified by tags between brackets. <strong>Each
				2321	tag opened has to be closed</strong>. XML is pedantic about this. However, if
				2322	a tag is empty (no content), a single tag can serve as both the opening and
				2323	closing tag if it ends with <code>/></code> rather than with
				2324	<code>></code>. Note that, for example, the image tag has no content (just
				2325	an attribute) and is closed by ending the tag with <code>/></code>.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	2326
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2327	<p>XML can be applied successfully to a wide range of tasks, ranging from
				2328	long term structured document maintenance (where it follows the steps of
				2329	SGML) to simple data encoding mechanisms like configuration file formatting
				2330	(glade), spreadsheets (gnumeric), or even shorter lived documents such as
				2331	WebDAV where it is used to encode remote calls between a client and a
				2332	server.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2333
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	2334	<h2><a name="XSLT">XSLT</a></h2>
				2335
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	2336	<p>Check <a href="http://xmlsoft.org/XSLT">the separate libxslt page</a></p>
				2337
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2338	<p><a href="http://www.w3.org/TR/xslt">XSL Transformations</a>, is a
				2339	language for transforming XML documents into other XML documents (or
				2340	HTML/textual output).</p>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	2341
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	2342	<p>A separate library called libxslt is available implementing XSLT-1.0 for
				2343	libxml2. This module "libxslt" too can be found in the Gnome CVS base.</p>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	2344
Daniel Veillard	29f6100	2005-08-06 09:07:15 +0000	[diff] [blame]	2345	<p>You can check the progresses on the libxslt <a
				2346	href="http://xmlsoft.org/XSLT/ChangeLog.html">Changelog</a>.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2347
				2348	<h2><a name="Python">Python and bindings</a></h2>
				2349
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2350	<p>There are a number of language bindings and wrappers available for
				2351	libxml2, the list below is not exhaustive. Please contact the <a
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2352	href="http://mail.gnome.org/mailman/listinfo/xml-bindings">xml-bindings@gnome.org</a>
				2353	(<a href="http://mail.gnome.org/archives/xml-bindings/">archives</a>) in
				2354	order to get updates to this list or to discuss the specific topic of libxml2
				2355	or libxslt wrappers or bindings:</p>
				2356	<ul>
Daniel Veillard	c14401e	2002-11-20 14:28:17 +0000	[diff] [blame]	2357	<li><a href="http://libxmlplusplus.sourceforge.net/">Libxml++</a> seems the
				2358	most up-to-date C++ bindings for libxml2, check the <a
				2359	href="http://libxmlplusplus.sourceforge.net/reference/html/hierarchy.html">documentation</a>
				2360	and the <a
				2361	href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/libxmlplusplus/libxml%2b%2b/examples/">examples</a>.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2362	<li>There is another <a href="http://libgdome-cpp.berlios.de/">C++ wrapper
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2363	based on the gdome2 bindings</a> maintained by Tobias Peters.</li>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	2364	<li>and a third C++ wrapper by Peter Jones <pjones@pmade.org>
				2365	<p>Website: <a
				2366	href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
				2367	</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2368	<li><a
				2369	href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2370	Sergeant</a> developed <a
				2371	href="http://axkit.org/download/">XML::LibXSLT</a>, a Perl wrapper for
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2372	libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2373	application server</a>.</li>
Daniel Veillard	4ac494b	2003-09-18 15:08:00 +0000	[diff] [blame]	2374	<li>If you're interested into scripting XML processing, have a look at <a
				2375	href="http://xsh.sourceforge.net/">XSH</a> an XML editing shell based on
				2376	Libxml2 Perl bindings.</li>
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	2377	<li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provides an
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2378	earlier version of the libxml/libxslt <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2379	href="http://www.rexx.com/~dkuhlman">wrappers for Python</a>.</li>
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	2380	<li>Gopal.V and Peter Minten develop <a
				2381	href="http://savannah.gnu.org/projects/libxmlsharp">libxml#</a>, a set of
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2382	C# libxml2 bindings.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2383	<li>Petr Kozelka provides <a
				2384	href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2385	libxml2</a> with Kylix, Delphi and other Pascal compilers.</li>
Daniel Veillard	b2fb8ed	2002-04-01 09:33:12 +0000	[diff] [blame]	2386	<li>Uwe Fechner also provides <a
				2387	href="http://sourceforge.net/projects/idom2-pas/">idom2</a>, a DOM2
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2388	implementation for Kylix2/D5/D6 from Borland.</li>
Daniel Veillard	142fb21	2005-04-07 12:48:10 +0000	[diff] [blame]	2389	<li>There is <a
				2390	href="http://rubyforge.org/projects/xml-tools/">bindings for Ruby</a> and
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2391	libxml2 bindings are also available in Ruby through the <a
				2392	href="http://libgdome-ruby.berlios.de/">libgdome-ruby</a> module
				2393	maintained by Tobias Peters.</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2394	<li>Steve Ball and contributors maintains <a
				2395	href="http://tclxml.sourceforge.net/">libxml2 and libxslt bindings for
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2396	Tcl</a>.</li>
Daniel Veillard	142fb21	2005-04-07 12:48:10 +0000	[diff] [blame]	2397	<li>libxml2 and libxslt is the default XML library for PHP5.</li>
Daniel Veillard	41b01a8	2003-02-27 11:09:06 +0000	[diff] [blame]	2398	<li><a href="http://savannah.gnu.org/projects/classpathx/">LibxmlJ</a> is
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	2399	an effort to create a 100% JAXP-compatible Java wrapper for libxml2 and
				2400	libxslt as part of GNU ClasspathX project.</li>
Daniel Veillard	6d373a2	2003-11-04 10:26:43 +0000	[diff] [blame]	2401	<li>Patrick McPhee provides Rexx bindings fof libxml2 and libxslt, look for
				2402	<a href="http://www.interlog.com/~ptjm/software.html">RexxXML</a>.</li>
Daniel Veillard	b78757b	2004-12-30 21:30:23 +0000	[diff] [blame]	2403	<li><a href="http://www.satimage.fr/software/en/xml_suite.html">Satimage</a>
				2404	provides <a
				2405	href="http://www.satimage.fr/software/en/downloads_osaxen.html">XMLLib
				2406	osax</a>. This is an osax for Mac OS X with a set of commands to
				2407	implement in AppleScript the XML DOM, XPATH and XSLT. Also includes
Daniel Veillard	c742609	2005-01-05 15:11:41 +0000	[diff] [blame]	2408	commands for Property-lists (Apple's fast lookup table XML format.)</li>
				2409	<li>Francesco Montorsi developped
				2410	<a href="https://sourceforge.net/project/showfiles.php?group_id=51305&package_id=45182">wxXml2</a>
				2411	wrappers that interface libxml2, allowing wxWidgets applications to
				2412	load/save/edit XML instances.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2413	</ul>
				2414
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2415	<p>The distribution includes a set of Python bindings, which are guaranteed
				2416	to be maintained as part of the library in the future, though the Python
Daniel Veillard	41b01a8	2003-02-27 11:09:06 +0000	[diff] [blame]	2417	interface have not yet reached the completeness of the C API.</p>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	2418
Daniel Veillard	929746e	2005-05-11 11:08:22 +0000	[diff] [blame]	2419	<p>Note that some of the Python purist dislike the default set of Python
				2420	bindings, rather than complaining I suggest they have a look at
Daniel Veillard	6c6d3c7	2005-05-11 11:12:30 +0000	[diff] [blame]	2421	<a href="http://codespeak.net/lxml/">lxml the more pythonic bindings for libxml2 and libxslt</a> and
				2422	<a href="http://codespeak.net/mailman/listinfo/lxml-dev">help Martijn Faassen</a>
				2423	complete those.</p>
Daniel Veillard	929746e	2005-05-11 11:08:22 +0000	[diff] [blame]	2424
Daniel Veillard	27907c7	2002-12-16 16:05:58 +0000	[diff] [blame]	2425	<p><a href="mailto:stephane.bidoul@softwareag.com">Stéphane Bidoul</a>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	2426	maintains <a href="http://users.skynet.be/sbi/libxml-python/">a Windows port
				2427	of the Python bindings</a>.</p>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2428
Daniel Veillard	7ef0fcb	2002-12-14 10:38:55 +0000	[diff] [blame]	2429	<p>Note to people interested in building bindings, the API is formalized as
				2430	<a href="libxml2-api.xml">an XML API description file</a> which allows to
				2431	automate a large part of the Python bindings, this includes function
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	2432	descriptions, enums, structures, typedefs, etc... The Python script used to
				2433	build the bindings is python/generator.py in the source distribution.</p>
Daniel Veillard	7ef0fcb	2002-12-14 10:38:55 +0000	[diff] [blame]	2434
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2435	<p>To install the Python bindings there are 2 options:</p>
Daniel Veillard	0b79dfe	2002-02-23 13:02:31 +0000	[diff] [blame]	2436	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2437	<li>If you use an RPM based distribution, simply install the <a
				2438	href="http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python">libxml2-python
				2439	RPM</a> (and if needed the <a
				2440	href="http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python">libxslt-python
				2441	RPM</a>).</li>
				2442	<li>Otherwise use the <a href="ftp://xmlsoft.org/python/">libxml2-python
				2443	module distribution</a> corresponding to your installed version of
				2444	libxml2 and libxslt. Note that to install it you will need both libxml2
				2445	and libxslt installed and run "python setup.py build install" in the
				2446	module tree.</li>
Daniel Veillard	0b79dfe	2002-02-23 13:02:31 +0000	[diff] [blame]	2447	</ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2448
				2449	<p>The distribution includes a set of examples and regression tests for the
				2450	python bindings in the <code>python/tests</code> directory. Here are some
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2451	excerpts from those tests:</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2452
				2453	<h3>tst.py:</h3>
				2454
				2455	<p>This is a basic test of the file interface and DOM navigation:</p>
MST 2003 John Fleck	2dffb76	2003-11-29 04:41:24 +0000	[diff] [blame]	2456	<pre>import libxml2, sys
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2457
				2458	doc = libxml2.parseFile("tst.xml")
				2459	if doc.name != "tst.xml":
				2460	print "doc.name failed"
				2461	sys.exit(1)
				2462	root = doc.children
				2463	if root.name != "doc":
				2464	print "root.name failed"
				2465	sys.exit(1)
				2466	child = root.children
				2467	if child.name != "foo":
				2468	print "child.name failed"
				2469	sys.exit(1)
				2470	doc.freeDoc()</pre>
				2471
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2472	<p>The Python module is called libxml2; parseFile is the equivalent of
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2473	xmlParseFile (most of the bindings are automatically generated, and the xml
				2474	prefix is removed and the casing convention are kept). All node seen at the
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2475	binding level share the same subset of accessors:</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2476	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2477	<li><code>name</code> : returns the node name</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2478	<li><code>type</code> : returns a string indicating the node type</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2479	<li><code>content</code> : returns the content of the node, it is based on
				2480	xmlNodeGetContent() and hence is recursive.</li>
				2481	<li><code>parent</code> , <code>children</code>, <code>last</code>,
				2482	<code>next</code>, <code>prev</code>, <code>doc</code>,
				2483	<code>properties</code>: pointing to the associated element in the tree,
				2484	those may return None in case no such link exists.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2485	</ul>
				2486
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2487	<p>Also note the need to explicitly deallocate documents with freeDoc() .
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2488	Reference counting for libxml2 trees would need quite a lot of work to
				2489	function properly, and rather than risk memory leaks if not implemented
				2490	correctly it sounds safer to have an explicit function to free a tree. The
				2491	wrapper python objects like doc, root or child are them automatically garbage
				2492	collected.</p>
				2493
				2494	<h3>validate.py:</h3>
				2495
				2496	<p>This test check the validation interfaces and redirection of error
				2497	messages:</p>
				2498	<pre>import libxml2
				2499
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2500	#deactivate error messages from the validation
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2501	def noerr(ctx, str):
				2502	pass
				2503
				2504	libxml2.registerErrorHandler(noerr, None)
				2505
				2506	ctxt = libxml2.createFileParserCtxt("invalid.xml")
				2507	ctxt.validate(1)
				2508	ctxt.parseDocument()
				2509	doc = ctxt.doc()
				2510	valid = ctxt.isValid()
				2511	doc.freeDoc()
				2512	if valid != 0:
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2513	print "validity check failed"</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2514
				2515	<p>The first thing to notice is the call to registerErrorHandler(), it
				2516	defines a new error handler global to the library. It is used to avoid seeing
				2517	the error messages when trying to validate the invalid document.</p>
				2518
				2519	<p>The main interest of that test is the creation of a parser context with
				2520	createFileParserCtxt() and how the behaviour can be changed before calling
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2521	parseDocument() . Similarly the informations resulting from the parsing phase
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2522	are also available using context methods.</p>
				2523
				2524	<p>Contexts like nodes are defined as class and the libxml2 wrappers maps the
				2525	C function interfaces in terms of objects method as much as possible. The
				2526	best to get a complete view of what methods are supported is to look at the
				2527	libxml2.py module containing all the wrappers.</p>
				2528
				2529	<h3>push.py:</h3>
				2530
				2531	<p>This test show how to activate the push parser interface:</p>
				2532	<pre>import libxml2
				2533
				2534	ctxt = libxml2.createPushParser(None, "<foo", 4, "test.xml")
				2535	ctxt.parseChunk("/>", 2, 1)
				2536	doc = ctxt.doc()
				2537
				2538	doc.freeDoc()</pre>
				2539
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2540	<p>The context is created with a special call based on the
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2541	xmlCreatePushParser() from the C library. The first argument is an optional
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2542	SAX callback object, then the initial set of data, the length and the name of
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2543	the resource in case URI-References need to be computed by the parser.</p>
				2544
				2545	<p>Then the data are pushed using the parseChunk() method, the last call
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2546	setting the third argument terminate to 1.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2547
				2548	<h3>pushSAX.py:</h3>
				2549
				2550	<p>this test show the use of the event based parsing interfaces. In this case
				2551	the parser does not build a document, but provides callback information as
				2552	the parser makes progresses analyzing the data being provided:</p>
				2553	<pre>import libxml2
				2554	log = ""
				2555
				2556	class callback:
				2557	def startDocument(self):
				2558	global log
				2559	log = log + "startDocument:"
				2560
				2561	def endDocument(self):
				2562	global log
				2563	log = log + "endDocument:"
				2564
				2565	def startElement(self, tag, attrs):
				2566	global log
				2567	log = log + "startElement %s %s:" % (tag, attrs)
				2568
				2569	def endElement(self, tag):
				2570	global log
				2571	log = log + "endElement %s:" % (tag)
				2572
				2573	def characters(self, data):
				2574	global log
				2575	log = log + "characters: %s:" % (data)
				2576
				2577	def warning(self, msg):
				2578	global log
				2579	log = log + "warning: %s:" % (msg)
				2580
				2581	def error(self, msg):
				2582	global log
				2583	log = log + "error: %s:" % (msg)
				2584
				2585	def fatalError(self, msg):
				2586	global log
				2587	log = log + "fatalError: %s:" % (msg)
				2588
				2589	handler = callback()
				2590
				2591	ctxt = libxml2.createPushParser(handler, "<foo", 4, "test.xml")
				2592	chunk = " url='tst'>b"
				2593	ctxt.parseChunk(chunk, len(chunk), 0)
				2594	chunk = "ar</foo>"
				2595	ctxt.parseChunk(chunk, len(chunk), 1)
				2596
Daniel Veillard	fcbfa2d	2002-02-21 17:54:27 +0000	[diff] [blame]	2597	reference = "startDocument:startElement foo {'url': 'tst'}:" + \
				2598	"characters: bar:endElement foo:endDocument:"
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2599	if log != reference:
				2600	print "Error got: %s" % log
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2601	print "Expected: %s" % reference</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2602
				2603	<p>The key object in that test is the handler, it provides a number of entry
				2604	points which can be called by the parser as it makes progresses to indicate
				2605	the information set obtained. The full set of callback is larger than what
				2606	the callback class in that specific example implements (see the SAX
				2607	definition for a complete list). The wrapper will only call those supplied by
				2608	the object when activated. The startElement receives the names of the element
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2609	and a dictionary containing the attributes carried by this element.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2610
				2611	<p>Also note that the reference string generated from the callback shows a
				2612	single character call even though the string "bar" is passed to the parser
				2613	from 2 different call to parseChunk()</p>
				2614
				2615	<h3>xpath.py:</h3>
				2616
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2617	<p>This is a basic test of XPath wrappers support</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2618	<pre>import libxml2
				2619
				2620	doc = libxml2.parseFile("tst.xml")
				2621	ctxt = doc.xpathNewContext()
				2622	res = ctxt.xpathEval("//*")
				2623	if len(res) != 2:
				2624	print "xpath query: wrong node set size"
				2625	sys.exit(1)
				2626	if res[0].name != "doc" or res[1].name != "foo":
				2627	print "xpath query: wrong node set value"
				2628	sys.exit(1)
				2629	doc.freeDoc()
				2630	ctxt.xpathFreeContext()</pre>
				2631
				2632	<p>This test parses a file, then create an XPath context to evaluate XPath
				2633	expression on it. The xpathEval() method execute an XPath query and returns
				2634	the result mapped in a Python way. String and numbers are natively converted,
				2635	and node sets are returned as a tuple of libxml2 Python nodes wrappers. Like
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2636	the document, the XPath context need to be freed explicitly, also not that
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2637	the result of the XPath query may point back to the document tree and hence
				2638	the document must be freed after the result of the query is used.</p>
				2639
				2640	<h3>xpathext.py:</h3>
				2641
				2642	<p>This test shows how to extend the XPath engine with functions written in
				2643	python:</p>
				2644	<pre>import libxml2
				2645
				2646	def foo(ctx, x):
				2647	return x + 1
				2648
				2649	doc = libxml2.parseFile("tst.xml")
				2650	ctxt = doc.xpathNewContext()
				2651	libxml2.registerXPathFunction(ctxt._o, "foo", None, foo)
				2652	res = ctxt.xpathEval("foo(1)")
				2653	if res != 2:
				2654	print "xpath extension failure"
				2655	doc.freeDoc()
				2656	ctxt.xpathFreeContext()</pre>
				2657
				2658	<p>Note how the extension function is registered with the context (but that
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2659	part is not yet finalized, this may change slightly in the future).</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2660
				2661	<h3>tstxpath.py:</h3>
				2662
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2663	<p>This test is similar to the previous one but shows how the extension
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2664	function can access the XPath evaluation context:</p>
				2665	<pre>def foo(ctx, x):
				2666	global called
				2667
				2668	#
				2669	# test that access to the XPath evaluation contexts
				2670	#
				2671	pctxt = libxml2.xpathParserContext(_obj=ctx)
				2672	ctxt = pctxt.context()
				2673	called = ctxt.function()
				2674	return x + 1</pre>
				2675
				2676	<p>All the interfaces around the XPath parser(or rather evaluation) context
				2677	are not finalized, but it should be sufficient to do contextual work at the
				2678	evaluation point.</p>
				2679
				2680	<h3>Memory debugging:</h3>
				2681
				2682	<p>last but not least, all tests starts with the following prologue:</p>
				2683	<pre>#memory debug specific
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2684	libxml2.debugMemory(1)</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2685
				2686	<p>and ends with the following epilogue:</p>
				2687	<pre>#memory debug specific
				2688	libxml2.cleanupParser()
				2689	if libxml2.debugMemory(1) == 0:
				2690	print "OK"
				2691	else:
				2692	print "Memory leak %d bytes" % (libxml2.debugMemory(1))
				2693	libxml2.dumpMemory()</pre>
				2694
				2695	<p>Those activate the memory debugging interface of libxml2 where all
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2696	allocated block in the library are tracked. The prologue then cleans up the
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	2697	library state and checks that all allocated memory has been freed. If not it
				2698	calls dumpMemory() which saves that list in a <code>.memdump</code> file.</p>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	2699
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	2700	<h2><a name="architecture">libxml2 architecture</a></h2>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2701
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	2702	<p>Libxml2 is made of multiple components; some of them are optional, and
				2703	most of the block interfaces are public. The main components are:</p>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2704	<ul>
				2705	<li>an Input/Output layer</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2706	<li>FTP and HTTP client layers (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2707	<li>an Internationalization layer managing the encodings support</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2708	<li>a URI module</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2709	<li>the XML parser and its basic SAX interface</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2710	<li>an HTML parser using the same SAX interface (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2711	<li>a SAX tree module to build an in-memory DOM representation</li>
				2712	<li>a tree module to manipulate the DOM representation</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2713	<li>a validation module using the DOM representation (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2714	<li>an XPath module for global lookup in a DOM representation
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2715	(optional)</li>
				2716	<li>a debug module (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2717	</ul>
				2718
				2719	<p>Graphically this gives the following:</p>
				2720
				2721	<p><img src="libxml.gif" alt="a graphical view of the various"></p>
				2722
				2723	<p></p>
				2724
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2725	<h2><a name="tree">The tree output</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2726
				2727	<p>The parser returns a tree built during the document analysis. The value
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2728	returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2729	<strong>xmlDoc</strong> structure). This structure contains information such
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	2730	as the file name, the document type, and a <strong>children</strong> pointer
				2731	which is the root of the document (or more exactly the first child under the
				2732	root which is the document). The tree is made of <strong>xmlNode</strong>s,
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2733	chained in double-linked lists of siblings and with a children<->parent
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	2734	relationship. An xmlNode can also carry properties (a chain of xmlAttr
				2735	structures). An attribute may have a value which is a list of TEXT or
				2736	ENTITY_REF nodes.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2737
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2738	<p>Here is an example (erroneous with respect to the XML spec since there
				2739	should be only one ELEMENT under the root):</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2740
				2741	<p><img src="structure.gif" alt=" structure.gif "></p>
				2742
				2743	<p>In the source package there is a small program (not installed by default)
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	2744	called <strong>xmllint</strong> which parses XML files given as argument and
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2745	prints them back as parsed. This is useful for detecting errors both in XML
				2746	code and in the XML parser itself. It has an option <strong>--debug</strong>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2747	which prints the actual in-memory structure of the document; here is the
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2748	result with the <a href="#example">example</a> given before:</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2749	<pre>DOCUMENT
				2750	version=1.0
				2751	standalone=true
				2752	ELEMENT EXAMPLE
				2753	ATTRIBUTE prop1
				2754	TEXT
				2755	content=gnome is great
				2756	ATTRIBUTE prop2
				2757	ENTITY_REF
				2758	TEXT
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	2759	content= linux too
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2760	ELEMENT head
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2761	ELEMENT title
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2762	TEXT
				2763	content=Welcome to Gnome
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2764	ELEMENT chapter
				2765	ELEMENT title
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2766	TEXT
				2767	content=The Linux adventure
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2768	ELEMENT p
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2769	TEXT
				2770	content=bla bla bla ...
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2771	ELEMENT image
				2772	ATTRIBUTE href
				2773	TEXT
				2774	content=linus.gif
				2775	ELEMENT p
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2776	TEXT
				2777	content=...</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2778
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2779	<p>This should be useful for learning the internal representation model.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	2780
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2781	<h2><a name="interface">The SAX interface</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2782
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2783	<p>Sometimes the DOM tree output is just too large to fit reasonably into
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2784	memory. In that case (and if you don't expect to save back the XML document
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	2785	loaded using libxml), it's better to use the SAX interface of libxml. SAX is
				2786	a <strong>callback-based interface</strong> to the parser. Before parsing,
				2787	the application layer registers a customized set of callbacks which are
				2788	called by the library as it progresses through the XML input.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2789
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2790	<p>To get more detailed step-by-step guidance on using the SAX interface of
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2791	libxml, see the <a
				2792	href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
				2793	documentation</a>.written by <a href="mailto:james@daa.com.au">James
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2794	Henstridge</a>.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2795
				2796	<p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
				2797	program located in the gnome-xml module (it's usually not shipped in the
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2798	binary packages of libxml, but you can find it in the tar source
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2799	distribution). Here is the sequence of callbacks that would be reported by
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2800	testSAX when parsing the example XML document shown earlier:</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2801	<pre>SAX.setDocumentLocator()
				2802	SAX.startDocument()
				2803	SAX.getEntity(amp)
				2804	SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too')
				2805	SAX.characters( , 3)
				2806	SAX.startElement(head)
				2807	SAX.characters( , 4)
				2808	SAX.startElement(title)
				2809	SAX.characters(Welcome to Gnome, 16)
				2810	SAX.endElement(title)
				2811	SAX.characters( , 3)
				2812	SAX.endElement(head)
				2813	SAX.characters( , 3)
				2814	SAX.startElement(chapter)
				2815	SAX.characters( , 4)
				2816	SAX.startElement(title)
				2817	SAX.characters(The Linux adventure, 19)
				2818	SAX.endElement(title)
				2819	SAX.characters( , 4)
				2820	SAX.startElement(p)
				2821	SAX.characters(bla bla bla ..., 15)
				2822	SAX.endElement(p)
				2823	SAX.characters( , 4)
				2824	SAX.startElement(image, href='linus.gif')
				2825	SAX.endElement(image)
				2826	SAX.characters( , 4)
				2827	SAX.startElement(p)
				2828	SAX.characters(..., 3)
				2829	SAX.endElement(p)
				2830	SAX.characters( , 3)
				2831	SAX.endElement(chapter)
				2832	SAX.characters( , 1)
				2833	SAX.endElement(EXAMPLE)
				2834	SAX.endDocument()</pre>
				2835
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	2836	<p>Most of the other interfaces of libxml2 are based on the DOM tree-building
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	2837	facility, so nearly everything up to the end of this document presupposes the
				2838	use of the standard DOM tree build. Note that the DOM tree itself is built by
				2839	a set of registered default callbacks, without internal specific
				2840	interface.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2841
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2842	<h2><a name="Validation">Validation & DTDs</a></h2>
				2843
				2844	<p>Table of Content:</p>
				2845	<ol>
				2846	<li><a href="#General5">General overview</a></li>
				2847	<li><a href="#definition">The definition</a></li>
				2848	<li><a href="#Simple">Simple rules</a>
				2849	<ol>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	2850	<li><a href="#reference">How to reference a DTD from a document</a></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2851	<li><a href="#Declaring">Declaring elements</a></li>
				2852	<li><a href="#Declaring1">Declaring attributes</a></li>
				2853	</ol>
				2854	</li>
				2855	<li><a href="#Some">Some examples</a></li>
				2856	<li><a href="#validate">How to validate</a></li>
				2857	<li><a href="#Other">Other resources</a></li>
				2858	</ol>
				2859
				2860	<h3><a name="General5">General overview</a></h3>
				2861
				2862	<p>Well what is validation and what is a DTD ?</p>
				2863
				2864	<p>DTD is the acronym for Document Type Definition. This is a description of
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2865	the content for a family of XML files. This is part of the XML 1.0
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2866	specification, and allows one to describe and verify that a given document
				2867	instance conforms to the set of rules detailing its structure and content.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2868
				2869	<p>Validation is the process of checking a document against a DTD (more
				2870	generally against a set of construction rules).</p>
				2871
				2872	<p>The validation process and building DTDs are the two most difficult parts
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2873	of the XML life cycle. Briefly a DTD defines all the possible elements to be
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2874	found within your document, what is the formal shape of your document tree
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2875	(by defining the allowed content of an element; either text, a regular
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2876	expression for the allowed list of children, or mixed content i.e. both text
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2877	and children). The DTD also defines the valid attributes for all elements and
				2878	the types of those attributes.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2879
				2880	<h3><a name="definition1">The definition</a></h3>
				2881
				2882	<p>The <a href="http://www.w3.org/TR/REC-xml">W3C XML Recommendation</a> (<a
				2883	href="http://www.xml.com/axml/axml.html">Tim Bray's annotated version of
				2884	Rev1</a>):</p>
				2885	<ul>
				2886	<li><a href="http://www.w3.org/TR/REC-xml#elemdecls">Declaring
				2887	elements</a></li>
				2888	<li><a href="http://www.w3.org/TR/REC-xml#attdecls">Declaring
				2889	attributes</a></li>
				2890	</ul>
				2891
				2892	<p>(unfortunately) all this is inherited from the SGML world, the syntax is
				2893	ancient...</p>
				2894
				2895	<h3><a name="Simple1">Simple rules</a></h3>
				2896
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2897	<p>Writing DTDs can be done in many ways. The rules to build them if you need
				2898	something permanent or something which can evolve over time can be radically
				2899	different. Really complex DTDs like DocBook ones are flexible but quite
				2900	harder to design. I will just focus on DTDs for a formats with a fixed simple
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2901	structure. It is just a set of basic rules, and definitely not exhaustive nor
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2902	usable for complex DTD design.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2903
				2904	<h4><a name="reference1">How to reference a DTD from a document</a>:</h4>
				2905
				2906	<p>Assuming the top element of the document is <code>spec</code> and the dtd
				2907	is placed in the file <code>mydtd</code> in the subdirectory
				2908	<code>dtds</code> of the directory from where the document were loaded:</p>
				2909
				2910	<p><code><!DOCTYPE spec SYSTEM "dtds/mydtd"></code></p>
				2911
				2912	<p>Notes:</p>
				2913	<ul>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2914	<li>The system string is actually an URI-Reference (as defined in <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2915	href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>) so you can use a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2916	full URL string indicating the location of your DTD on the Web. This is a
				2917	really good thing to do if you want others to validate your document.</li>
				2918	<li>It is also possible to associate a <code>PUBLIC</code> identifier (a
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2919	magic string) so that the DTD is looked up in catalogs on the client side
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2920	without having to locate it on the web.</li>
				2921	<li>A DTD contains a set of element and attribute declarations, but they
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2922	don't define what the root of the document should be. This is explicitly
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2923	told to the parser/validator as the first element of the
				2924	<code>DOCTYPE</code> declaration.</li>
				2925	</ul>
				2926
				2927	<h4><a name="Declaring2">Declaring elements</a>:</h4>
				2928
				2929	<p>The following declares an element <code>spec</code>:</p>
				2930
				2931	<p><code><!ELEMENT spec (front, body, back?)></code></p>
				2932
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2933	<p>It also expresses that the spec element contains one <code>front</code>,
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2934	one <code>body</code> and one optional <code>back</code> children elements in
				2935	this order. The declaration of one element of the structure and its content
				2936	are done in a single declaration. Similarly the following declares
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2937	<code>div1</code> elements:</p>
				2938
Daniel Veillard	5173727	2002-01-23 23:10:38 +0000	[diff] [blame]	2939	<p><code><!ELEMENT div1 (head, (p \| list \| note)*, div2?)></code></p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2940
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2941	<p>which means div1 contains one <code>head</code> then a series of optional
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2942	<code>p</code>, <code>list</code>s and <code>note</code>s and then an
				2943	optional <code>div2</code>. And last but not least an element can contain
				2944	text:</p>
				2945
				2946	<p><code><!ELEMENT b (#PCDATA)></code></p>
				2947
				2948	<p><code>b</code> contains text or being of mixed content (text and elements
				2949	in no particular order):</p>
				2950
				2951	<p><code><!ELEMENT p (#PCDATA\|a\|ul\|b\|i\|em)*></code></p>
				2952
				2953	<p><code>p </code>can contain text or <code>a</code>, <code>ul</code>,
				2954	<code>b</code>, <code>i </code>or <code>em</code> elements in no particular
				2955	order.</p>
				2956
				2957	<h4><a name="Declaring1">Declaring attributes</a>:</h4>
				2958
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2959	<p>Again the attributes declaration includes their content definition:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2960
				2961	<p><code><!ATTLIST termdef name CDATA #IMPLIED></code></p>
				2962
				2963	<p>means that the element <code>termdef</code> can have a <code>name</code>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2964	attribute containing text (<code>CDATA</code>) and which is optional
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2965	(<code>#IMPLIED</code>). The attribute value can also be defined within a
				2966	set:</p>
				2967
				2968	<p><code><!ATTLIST list type (bullets\|ordered\|glossary)
				2969	"ordered"></code></p>
				2970
				2971	<p>means <code>list</code> element have a <code>type</code> attribute with 3
				2972	allowed values "bullets", "ordered" or "glossary" and which default to
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2973	"ordered" if the attribute is not explicitly specified.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2974
				2975	<p>The content type of an attribute can be text (<code>CDATA</code>),
				2976	anchor/reference/references
				2977	(<code>ID</code>/<code>IDREF</code>/<code>IDREFS</code>), entity(ies)
				2978	(<code>ENTITY</code>/<code>ENTITIES</code>) or name(s)
				2979	(<code>NMTOKEN</code>/<code>NMTOKENS</code>). The following defines that a
				2980	<code>chapter</code> element can have an optional <code>id</code> attribute
				2981	of type <code>ID</code>, usable for reference from attribute of type
				2982	IDREF:</p>
				2983
				2984	<p><code><!ATTLIST chapter id ID #IMPLIED></code></p>
				2985
				2986	<p>The last value of an attribute definition can be <code>#REQUIRED
				2987	</code>meaning that the attribute has to be given, <code>#IMPLIED</code>
				2988	meaning that it is optional, or the default value (possibly prefixed by
				2989	<code>#FIXED</code> if it is the only allowed).</p>
				2990
				2991	<p>Notes:</p>
				2992	<ul>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2993	<li>Usually the attributes pertaining to a given element are declared in a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2994	single expression, but it is just a convention adopted by a lot of DTD
				2995	writers:
				2996	<pre><!ATTLIST termdef
				2997	id ID #REQUIRED
				2998	name CDATA #IMPLIED></pre>
				2999	<p>The previous construct defines both <code>id</code> and
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	3000	<code>name</code> attributes for the element <code>termdef</code>.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3001	</li>
				3002	</ul>
				3003
				3004	<h3><a name="Some1">Some examples</a></h3>
				3005
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3006	<p>The directory <code>test/valid/dtds/</code> in the libxml2 distribution
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	3007	contains some complex DTD examples. The example in the file
				3008	<code>test/valid/dia.xml</code> shows an XML file where the simple DTD is
				3009	directly included within the document.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3010
				3011	<h3><a name="validate1">How to validate</a></h3>
				3012
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	3013	<p>The simplest way is to use the xmllint program included with libxml. The
				3014	<code>--valid</code> option turns-on validation of the files given as input.
				3015	For example the following validates a copy of the first revision of the XML
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3016	1.0 specification:</p>
				3017
				3018	<p><code>xmllint --valid --noout test/valid/REC-xml-19980210.xml</code></p>
				3019
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	3020	<p>the -- noout is used to disable output of the resulting tree.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3021
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	3022	<p>The <code>--dtdvalid dtd</code> allows validation of the document(s)
				3023	against a given DTD.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3024
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3025	<p>Libxml2 exports an API to handle DTDs and validation, check the <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3026	href="http://xmlsoft.org/html/libxml-valid.html">associated
				3027	description</a>.</p>
				3028
				3029	<h3><a name="Other1">Other resources</a></h3>
				3030
				3031	<p>DTDs are as old as SGML. So there may be a number of examples on-line, I
				3032	will just list one for now, others pointers welcome:</p>
				3033	<ul>
				3034	<li><a href="http://www.xml101.com:8081/dtd/">XML-101 DTD</a></li>
				3035	</ul>
				3036
				3037	<p>I suggest looking at the examples found under test/valid/dtd and any of
				3038	the large number of books available on XML. The dia example in test/valid
				3039	should be both simple and complete enough to allow you to build your own.</p>
				3040
				3041	<p></p>
				3042
				3043	<h2><a name="Memory">Memory Management</a></h2>
				3044
				3045	<p>Table of Content:</p>
				3046	<ol>
				3047	<li><a href="#General3">General overview</a></li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3048	<li><a href="#setting">Setting libxml2 set of memory routines</a></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3049	<li><a href="#cleanup">Cleaning up after parsing</a></li>
				3050	<li><a href="#Debugging">Debugging routines</a></li>
				3051	<li><a href="#General4">General memory requirements</a></li>
				3052	</ol>
				3053
				3054	<h3><a name="General3">General overview</a></h3>
				3055
				3056	<p>The module <code><a
				3057	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlmemory.h</a></code>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3058	provides the interfaces to the libxml2 memory system:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3059	<ul>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3060	<li>libxml2 does not use the libc memory allocator directly but xmlFree(),
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3061	xmlMalloc() and xmlRealloc()</li>
				3062	<li>those routines can be reallocated to a specific set of routine, by
				3063	default the libc ones i.e. free(), malloc() and realloc()</li>
				3064	<li>the xmlmemory.c module includes a set of debugging routine</li>
				3065	</ul>
				3066
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3067	<h3><a name="setting">Setting libxml2 set of memory routines</a></h3>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3068
				3069	<p>It is sometimes useful to not use the default memory allocator, either for
				3070	debugging, analysis or to implement a specific behaviour on memory management
				3071	(like on embedded systems). Two function calls are available to do so:</p>
				3072	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3073	<li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemGet
				3074	()</a> which return the current set of functions in use by the parser</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3075	<li><a
				3076	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemSetup()</a>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3077	which allow to set up a new set of memory allocation functions</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3078	</ul>
				3079
				3080	<p>Of course a call to xmlMemSetup() should probably be done before calling
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3081	any other libxml2 routines (unless you are sure your allocations routines are
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3082	compatibles).</p>
				3083
				3084	<h3><a name="cleanup">Cleaning up after parsing</a></h3>
				3085
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3086	<p>Libxml2 is not stateless, there is a few set of memory structures needing
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3087	allocation before the parser is fully functional (some encoding structures
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3088	for example). This also mean that once parsing is finished there is a tiny
				3089	amount of memory (a few hundred bytes) which can be recollected if you don't
				3090	reuse the parser immediately:</p>
				3091	<ul>
				3092	<li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlCleanupParser
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3093	()</a> is a centralized routine to free the parsing states. Note that it
				3094	won't deallocate any produced tree if any (use the xmlFreeDoc() and
				3095	related routines for this).</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3096	<li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlInitParser
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3097	()</a> is the dual routine allowing to preallocate the parsing state
				3098	which can be useful for example to avoid initialization reentrancy
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3099	problems when using libxml2 in multithreaded applications</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3100	</ul>
				3101
				3102	<p>Generally xmlCleanupParser() is safe, if needed the state will be rebuild
				3103	at the next invocation of parser routines, but be careful of the consequences
				3104	in multithreaded applications.</p>
				3105
				3106	<h3><a name="Debugging">Debugging routines</a></h3>
				3107
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3108	<p>When configured using --with-mem-debug flag (off by default), libxml2 uses
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3109	a set of memory allocation debugging routines keeping track of all allocated
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3110	blocks and the location in the code where the routine was called. A couple of
				3111	other debugging routines allow to dump the memory allocated infos to a file
				3112	or call a specific routine when a given block number is allocated:</p>
				3113	<ul>
				3114	<li><a
				3115	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMallocLoc()</a>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3116	<a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3117	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlReallocLoc()</a>
				3118	and <a
				3119	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemStrdupLoc()</a>
				3120	are the memory debugging replacement allocation routines</li>
				3121	<li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemoryDump
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3122	()</a> dumps all the informations about the allocated memory block lefts
				3123	in the <code>.memdump</code> file</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3124	</ul>
				3125
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3126	<p>When developing libxml2 memory debug is enabled, the tests programs call
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3127	xmlMemoryDump () and the "make test" regression tests will check for any
				3128	memory leak during the full regression test sequence, this helps a lot
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3129	ensuring that libxml2 does not leak memory and bullet proof memory
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3130	allocations use (some libc implementations are known to be far too permissive
				3131	resulting in major portability problems!).</p>
				3132
				3133	<p>If the .memdump reports a leak, it displays the allocation function and
				3134	also tries to give some informations about the content and structure of the
				3135	allocated blocks left. This is sufficient in most cases to find the culprit,
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3136	but not always. Assuming the allocation problem is reproducible, it is
				3137	possible to find more easily:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3138	<ol>
				3139	<li>write down the block number xxxx not allocated</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3140	<li>export the environment variable XML_MEM_BREAKPOINT=xxxx , the easiest
Daniel Veillard	7579482	2002-04-11 16:24:32 +0000	[diff] [blame]	3141	when using GDB is to simply give the command
				3142	<p><code>set environment XML_MEM_BREAKPOINT xxxx</code></p>
				3143	<p>before running the program.</p>
				3144	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3145	<li>run the program under a debugger and set a breakpoint on
				3146	xmlMallocBreakpoint() a specific function called when this precise block
				3147	is allocated</li>
				3148	<li>when the breakpoint is reached you can then do a fine analysis of the
				3149	allocation an step to see the condition resulting in the missing
				3150	deallocation.</li>
				3151	</ol>
				3152
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3153	<p>I used to use a commercial tool to debug libxml2 memory problems but after
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3154	noticing that it was not detecting memory leaks that simple mechanism was
Daniel Veillard	7579482	2002-04-11 16:24:32 +0000	[diff] [blame]	3155	used and proved extremely efficient until now. Lately I have also used <a
				3156	href="http://developer.kde.org/~sewardj/">valgrind</a> with quite some
				3157	success, it is tied to the i386 architecture since it works by emulating the
				3158	processor and instruction set, it is slow but extremely efficient, i.e. it
				3159	spot memory usage errors in a very precise way.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3160
				3161	<h3><a name="General4">General memory requirements</a></h3>
				3162
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3163	<p>How much libxml2 memory require ? It's hard to tell in average it depends
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3164	of a number of things:</p>
				3165	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3166	<li>the parser itself should work in a fixed amount of memory, except for
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3167	information maintained about the stacks of names and entities locations.
				3168	The I/O and encoding handlers will probably account for a few KBytes.
				3169	This is true for both the XML and HTML parser (though the HTML parser
				3170	need more state).</li>
				3171	<li>If you are generating the DOM tree then memory requirements will grow
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3172	nearly linear with the size of the data. In general for a balanced
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3173	textual document the internal memory requirement is about 4 times the
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3174	size of the UTF8 serialization of this document (example the XML-1.0
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3175	recommendation is a bit more of 150KBytes and takes 650KBytes of main
				3176	memory when parsed). Validation will add a amount of memory required for
				3177	maintaining the external Dtd state which should be linear with the
				3178	complexity of the content model defined by the Dtd</li>
Daniel Veillard	ce192eb	2003-04-16 15:58:05 +0000	[diff] [blame]	3179	<li>If you need to work with fixed memory requirements or don't need the
				3180	full DOM tree then using the <a href="xmlreader.html">xmlReader
				3181	interface</a> is probably the best way to proceed, it still allows to
				3182	validate or operate on subset of the tree if needed.</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3183	<li>If you don't care about the advanced features of libxml2 like
Daniel Veillard	ce192eb	2003-04-16 15:58:05 +0000	[diff] [blame]	3184	validation, DOM, XPath or XPointer, don't use entities, need to work with
				3185	fixed memory requirements, and try to get the fastest parsing possible
				3186	then the SAX interface should be used, but it has known restrictions.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3187	</ul>
				3188
				3189	<p></p>
				3190
				3191	<h2><a name="Encodings">Encodings support</a></h2>
				3192
Daniel Veillard	e5d68de	2005-03-10 15:03:40 +0000	[diff] [blame]	3193	<p>If you are not really familiar with Internationalization (usual shortcut
				3194	is I18N) , Unicode, characters and glyphs, I suggest you read a <a
				3195	href="http://www.tbray.org/ongoing/When/200x/2003/04/06/Unicode">presentation</a>
				3196	by Tim Bray on Unicode and why you should care about it.</p>
				3197	<p>If you don't understand why <b>it does not make sense to have a string
				3198	without knowing what encoding it uses</b>, then as Joel Spolsky said
				3199	<a href="http://www.joelonsoftware.com/articles/Unicode.html">please do
				3200	not write another line of code until you finish reading that article.</a>.
				3201	It is a prerequisite to understand this page, and avoid a lot of problems
				3202	with libxml2, XML or text processing in general.</p>
				3203
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3204	<p>Table of Content:</p>
				3205	<ol>
				3206	<li><a href="encoding.html#What">What does internationalization support
				3207	mean ?</a></li>
				3208	<li><a href="encoding.html#internal">The internal encoding, how and
				3209	why</a></li>
				3210	<li><a href="encoding.html#implemente">How is it implemented ?</a></li>
				3211	<li><a href="encoding.html#Default">Default supported encodings</a></li>
				3212	<li><a href="encoding.html#extend">How to extend the existing
				3213	support</a></li>
				3214	</ol>
				3215
				3216	<h3><a name="What">What does internationalization support mean ?</a></h3>
				3217
				3218	<p>XML was designed from the start to allow the support of any character set
				3219	by using Unicode. Any conformant XML parser has to support the UTF-8 and
				3220	UTF-16 default encodings which can both express the full unicode ranges. UTF8
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3221	is a variable length encoding whose greatest points are to reuse the same
				3222	encoding for ASCII and to save space for Western encodings, but it is a bit
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3223	more complex to handle in practice. UTF-16 use 2 bytes per character (and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3224	sometimes combines two pairs), it makes implementation easier, but looks a
				3225	bit overkill for Western languages encoding. Moreover the XML specification
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	3226	allows the document to be encoded in other encodings at the condition that
				3227	they are clearly labeled as such. For example the following is a wellformed
				3228	XML document encoded in ISO-8859-1 and using accentuated letters that we
				3229	French like for both markup and content:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3230	<pre><?xml version="1.0" encoding="ISO-8859-1"?>
				3231	<très>là</très></pre>
				3232
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3233	<p>Having internationalization support in libxml2 means the following:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3234	<ul>
				3235	<li>the document is properly parsed</li>
				3236	<li>informations about it's encoding are saved</li>
				3237	<li>it can be modified</li>
				3238	<li>it can be saved in its original encoding</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3239	<li>it can also be saved in another encoding supported by libxml2 (for
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3240	example straight UTF8 or even an ASCII form)</li>
				3241	</ul>
				3242
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3243	<p>Another very important point is that the whole libxml2 API, with the
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3244	exception of a few routines to read with a specific encoding or save to a
				3245	specific encoding, is completely agnostic about the original encoding of the
				3246	document.</p>
				3247
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3248	<p>It should be noted too that the HTML parser embedded in libxml2 now obey
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3249	the same rules too, the following document will be (as of 2.2.2) handled in
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3250	an internationalized fashion by libxml2 too:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3251	<pre><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
				3252	"http://www.w3.org/TR/REC-html40/loose.dtd">
				3253	<html lang="fr">
				3254	<head>
				3255	<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
				3256	</head>
				3257	<body>
				3258	<p>W3C crée des standards pour le Web.</body>
				3259	</html></pre>
				3260
				3261	<h3><a name="internal">The internal encoding, how and why</a></h3>
				3262
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3263	<p>One of the core decisions was to force all documents to be converted to a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3264	default internal encoding, and that encoding to be UTF-8, here are the
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3265	rationales for those choices:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3266	<ul>
				3267	<li>keeping the native encoding in the internal form would force the libxml
				3268	users (or the code associated) to be fully aware of the encoding of the
				3269	original document, for examples when adding a text node to a document,
				3270	the content would have to be provided in the document encoding, i.e. the
				3271	client code would have to check it before hand, make sure it's conformant
				3272	to the encoding, etc ... Very hard in practice, though in some specific
				3273	cases this may make sense.</li>
				3274	<li>the second decision was which encoding. From the XML spec only UTF8 and
				3275	UTF16 really makes sense as being the two only encodings for which there
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3276	is mandatory support. UCS-4 (32 bits fixed size encoding) could be
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3277	considered an intelligent choice too since it's a direct Unicode mapping
				3278	support. I selected UTF-8 on the basis of efficiency and compatibility
				3279	with surrounding software:
				3280	<ul>
				3281	<li>UTF-8 while a bit more complex to convert from/to (i.e. slightly
				3282	more costly to import and export CPU wise) is also far more compact
				3283	than UTF-16 (and UCS-4) for a majority of the documents I see it used
				3284	for right now (RPM RDF catalogs, advogato data, various configuration
				3285	file formats, etc.) and the key point for today's computer
				3286	architecture is efficient uses of caches. If one nearly double the
				3287	memory requirement to store the same amount of data, this will trash
				3288	caches (main memory/external caches/internal caches) and my take is
				3289	that this harms the system far more than the CPU requirements needed
				3290	for the conversion to UTF-8</li>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3291	<li>Most of libxml2 version 1 users were using it with straight ASCII
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3292	most of the time, doing the conversion with an internal encoding
				3293	requiring all their code to be rewritten was a serious show-stopper
				3294	for using UTF-16 or UCS-4.</li>
				3295	<li>UTF-8 is being used as the de-facto internal encoding standard for
				3296	related code like the <a href="http://www.pango.org/">pango</a>
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3297	upcoming Gnome text widget, and a lot of Unix code (yet another place
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3298	where Unix programmer base takes a different approach from Microsoft
				3299	- they are using UTF-16)</li>
				3300	</ul>
				3301	</li>
				3302	</ul>
				3303
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3304	<p>What does this mean in practice for the libxml2 user:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3305	<ul>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3306	<li>xmlChar, the libxml2 data type is a byte, those bytes must be assembled
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3307	as UTF-8 valid strings. The proper way to terminate an xmlChar * string
				3308	is simply to append 0 byte, as usual.</li>
				3309	<li>One just need to make sure that when using chars outside the ASCII set,
				3310	the values has been properly converted to UTF-8</li>
				3311	</ul>
				3312
				3313	<h3><a name="implemente">How is it implemented ?</a></h3>
				3314
				3315	<p>Let's describe how all this works within libxml, basically the I18N
				3316	(internationalization) support get triggered only during I/O operation, i.e.
				3317	when reading a document or saving one. Let's look first at the reading
				3318	sequence:</p>
				3319	<ol>
				3320	<li>when a document is processed, we usually don't know the encoding, a
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	3321	simple heuristic allows to detect UTF-16 and UCS-4 from encodings where
				3322	the ASCII range (0-0x7F) maps with ASCII</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3323	<li>the xml declaration if available is parsed, including the encoding
				3324	declaration. At that point, if the autodetected encoding is different
				3325	from the one declared a call to xmlSwitchEncoding() is issued.</li>
				3326	<li>If there is no encoding declaration, then the input has to be in either
				3327	UTF-8 or UTF-16, if it is not then at some point when processing the
				3328	input, the converter/checker of UTF-8 form will raise an encoding error.
				3329	You may end-up with a garbled document, or no document at all ! Example:
				3330	<pre>~/XML -> ./xmllint err.xml
				3331	err.xml:1: error: Input is not proper UTF-8, indicate encoding !
				3332	<très>là</très>
				3333	^
				3334	err.xml:1: error: Bytes: 0xE8 0x73 0x3E 0x6C
				3335	<très>là</très>
				3336	^</pre>
				3337	</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3338	<li>xmlSwitchEncoding() does an encoding name lookup, canonicalize it, and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3339	then search the default registered encoding converters for that encoding.
				3340	If it's not within the default set and iconv() support has been compiled
				3341	it, it will ask iconv for such an encoder. If this fails then the parser
				3342	will report an error and stops processing:
				3343	<pre>~/XML -> ./xmllint err2.xml
				3344	err2.xml:1: error: Unsupported encoding UnsupportedEnc
				3345	<?xml version="1.0" encoding="UnsupportedEnc"?>
				3346	^</pre>
				3347	</li>
Daniel Veillard	46c5c1d	2002-05-20 07:15:54 +0000	[diff] [blame]	3348	<li>From that point the encoder processes progressively the input (it is
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3349	plugged as a front-end to the I/O module) for that entity. It captures
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3350	and converts on-the-fly the document to be parsed to UTF-8. The parser
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3351	itself just does UTF-8 checking of this input and process it
				3352	transparently. The only difference is that the encoding information has
				3353	been added to the parsing context (more precisely to the input
				3354	corresponding to this entity).</li>
				3355	<li>The result (when using DOM) is an internal form completely in UTF-8
				3356	with just an encoding information on the document node.</li>
				3357	</ol>
				3358
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3359	<p>Ok then what happens when saving the document (assuming you
				3360	collected/built an xmlDoc DOM like structure) ? It depends on the function
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3361	called, xmlSaveFile() will just try to save in the original encoding, while
				3362	xmlSaveFileTo() and xmlSaveFileEnc() can optionally save to a given
				3363	encoding:</p>
				3364	<ol>
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3365	<li>if no encoding is given, libxml2 will look for an encoding value
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3366	associated to the document and if it exists will try to save to that
				3367	encoding,
				3368	<p>otherwise everything is written in the internal form, i.e. UTF-8</p>
				3369	</li>
				3370	<li>so if an encoding was specified, either at the API level or on the
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3371	document, libxml2 will again canonicalize the encoding name, lookup for a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3372	converter in the registered set or through iconv. If not found the
				3373	function will return an error code</li>
				3374	<li>the converter is placed before the I/O buffer layer, as another kind of
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3375	buffer, then libxml2 will simply push the UTF-8 serialization to through
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3376	that buffer, which will then progressively be converted and pushed onto
				3377	the I/O layer.</li>
				3378	<li>It is possible that the converter code fails on some input, for example
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3379	trying to push an UTF-8 encoded Chinese character through the UTF-8 to
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3380	ISO-8859-1 converter won't work. Since the encoders are progressive they
				3381	will just report the error and the number of bytes converted, at that
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3382	point libxml2 will decode the offending character, remove it from the
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3383	buffer and replace it with the associated charRef encoding &#123; and
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3384	resume the conversion. This guarantees that any document will be saved
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3385	without losses (except for markup names where this is not legal, this is
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3386	a problem in the current version, in practice avoid using non-ascii
Daniel Veillard	189f46b	2004-01-25 21:03:04 +0000	[diff] [blame]	3387	characters for tag or attribute names). A special "ascii" encoding name
				3388	is used to save documents to a pure ascii form can be used when
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3389	portability is really crucial</li>
				3390	</ol>
				3391
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3392	<p>Here are a few examples based on the same test document:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3393	<pre>~/XML -> ./xmllint isolat1
				3394	<?xml version="1.0" encoding="ISO-8859-1"?>
				3395	<très>là</très>
				3396	~/XML -> ./xmllint --encode UTF-8 isolat1
				3397	<?xml version="1.0" encoding="UTF-8"?>
				3398	<trÃ¨s>lÃ </trÃ¨s>
				3399	~/XML -> </pre>
				3400
				3401	<p>The same processing is applied (and reuse most of the code) for HTML I18N
				3402	processing. Looking up and modifying the content encoding is a bit more
				3403	difficult since it is located in a <meta> tag under the <head>,
				3404	so a couple of functions htmlGetMetaEncoding() and htmlSetMetaEncoding() have
				3405	been provided. The parser also attempts to switch encoding on the fly when
				3406	detecting such a tag on input. Except for that the processing is the same
				3407	(and again reuses the same code).</p>
				3408
				3409	<h3><a name="Default">Default supported encodings</a></h3>
				3410
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3411	<p>libxml2 has a set of default converters for the following encodings
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3412	(located in encoding.c):</p>
				3413	<ol>
				3414	<li>UTF-8 is supported by default (null handlers)</li>
				3415	<li>UTF-16, both little and big endian</li>
				3416	<li>ISO-Latin-1 (ISO-8859-1) covering most western languages</li>
				3417	<li>ASCII, useful mostly for saving</li>
				3418	<li>HTML, a specific handler for the conversion of UTF-8 to ASCII with HTML
				3419	predefined entities like &copy; for the Copyright sign.</li>
				3420	</ol>
				3421
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	3422	<p>More over when compiled on an Unix platform with iconv support the full
				3423	set of encodings supported by iconv can be instantly be used by libxml. On a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3424	linux machine with glibc-2.1 the list of supported encodings and aliases fill
				3425	3 full pages, and include UCS-4, the full set of ISO-Latin encodings, and the
				3426	various Japanese ones.</p>
				3427
				3428	<h4>Encoding aliases</h4>
				3429
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3430	<p>From 2.2.3, libxml2 has support to register encoding names aliases. The
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3431	goal is to be able to parse document whose encoding is supported but where
				3432	the name differs (for example from the default set of names accepted by
				3433	iconv). The following functions allow to register and handle new aliases for
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3434	existing encodings. Once registered libxml2 will automatically lookup the
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3435	aliases when handling a document:</p>
				3436	<ul>
				3437	<li>int xmlAddEncodingAlias(const char name, const char alias);</li>
				3438	<li>int xmlDelEncodingAlias(const char *alias);</li>
				3439	<li>const char * xmlGetEncodingAlias(const char *alias);</li>
				3440	<li>void xmlCleanupEncodingAliases(void);</li>
				3441	</ul>
				3442
				3443	<h3><a name="extend">How to extend the existing support</a></h3>
				3444
				3445	<p>Well adding support for new encoding, or overriding one of the encoders
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	3446	(assuming it is buggy) should not be hard, just write input and output
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3447	conversion routines to/from UTF-8, and register them using
				3448	xmlNewCharEncodingHandler(name, xxxToUTF8, UTF8Toxxx), and they will be
				3449	called automatically if the parser(s) encounter such an encoding name
				3450	(register it uppercase, this will help). The description of the encoders,
				3451	their arguments and expected return values are described in the encoding.h
				3452	header.</p>
				3453
				3454	<p>A quick note on the topic of subverting the parser to use a different
				3455	internal encoding than UTF-8, in some case people will absolutely want to
				3456	keep the internal encoding different, I think it's still possible (but the
				3457	encoding must be compliant with ASCII on the same subrange) though I didn't
				3458	tried it. The key is to override the default conversion routines (by
				3459	registering null encoders/decoders for your charsets), and bypass the UTF-8
				3460	checking of the parser by setting the parser context charset
				3461	(ctxt->charset) to something different than XML_CHAR_ENCODING_UTF8, but
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3462	there is no guarantee that this will work. You may also have some troubles
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3463	saving back.</p>
				3464
				3465	<p>Basically proper I18N support is important, this requires at least
				3466	libxml-2.0.0, but a lot of features and corrections are really available only
				3467	starting 2.2.</p>
				3468
				3469	<h2><a name="IO">I/O Interfaces</a></h2>
				3470
				3471	<p>Table of Content:</p>
				3472	<ol>
				3473	<li><a href="#General1">General overview</a></li>
				3474	<li><a href="#basic">The basic buffer type</a></li>
				3475	<li><a href="#Input">Input I/O handlers</a></li>
				3476	<li><a href="#Output">Output I/O handlers</a></li>
				3477	<li><a href="#entities">The entities loader</a></li>
				3478	<li><a href="#Example2">Example of customized I/O</a></li>
				3479	</ol>
				3480
				3481	<h3><a name="General1">General overview</a></h3>
				3482
				3483	<p>The module <code><a
				3484	href="http://xmlsoft.org/html/libxml-xmlio.html">xmlIO.h</a></code> provides
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3485	the interfaces to the libxml2 I/O system. This consists of 4 main parts:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3486	<ul>
				3487	<li>Entities loader, this is a routine which tries to fetch the entities
				3488	(files) based on their PUBLIC and SYSTEM identifiers. The default loader
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3489	don't look at the public identifier since libxml2 do not maintain a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3490	catalog. You can redefine you own entity loader by using
				3491	<code>xmlGetExternalEntityLoader()</code> and
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	3492	<code>xmlSetExternalEntityLoader()</code>. <a href="#entities">Check the
				3493	example</a>.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3494	<li>Input I/O buffers which are a commodity structure used by the parser(s)
				3495	input layer to handle fetching the informations to feed the parser. This
				3496	provides buffering and is also a placeholder where the encoding
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3497	converters to UTF8 are piggy-backed.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3498	<li>Output I/O buffers are similar to the Input ones and fulfill similar
				3499	task but when generating a serialization from a tree.</li>
				3500	<li>A mechanism to register sets of I/O callbacks and associate them with
				3501	specific naming schemes like the protocol part of the URIs.
				3502	<p>This affect the default I/O operations and allows to use specific I/O
				3503	handlers for certain names.</p>
				3504	</li>
				3505	</ul>
				3506
				3507	<p>The general mechanism used when loading http://rpmfind.net/xml.html for
				3508	example in the HTML parser is the following:</p>
				3509	<ol>
				3510	<li>The default entity loader calls <code>xmlNewInputFromFile()</code> with
				3511	the parsing context and the URI string.</li>
				3512	<li>the URI string is checked against the existing registered handlers
				3513	using their match() callback function, if the HTTP module was compiled
				3514	in, it is registered and its match() function will succeeds</li>
				3515	<li>the open() function of the handler is called and if successful will
				3516	return an I/O Input buffer</li>
				3517	<li>the parser will the start reading from this buffer and progressively
				3518	fetch information from the resource, calling the read() function of the
				3519	handler until the resource is exhausted</li>
				3520	<li>if an encoding change is detected it will be installed on the input
				3521	buffer, providing buffering and efficient use of the conversion
				3522	routines</li>
				3523	<li>once the parser has finished, the close() function of the handler is
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3524	called once and the Input buffer and associated resources are
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3525	deallocated.</li>
				3526	</ol>
				3527
				3528	<p>The user defined callbacks are checked first to allow overriding of the
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3529	default libxml2 I/O routines.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3530
				3531	<h3><a name="basic">The basic buffer type</a></h3>
				3532
				3533	<p>All the buffer manipulation handling is done using the
				3534	<code>xmlBuffer</code> type define in <code><a
				3535	href="http://xmlsoft.org/html/libxml-tree.html">tree.h</a> </code>which is a
				3536	resizable memory buffer. The buffer allocation strategy can be selected to be
				3537	either best-fit or use an exponential doubling one (CPU vs. memory use
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3538	trade-off). The values are <code>XML_BUFFER_ALLOC_EXACT</code> and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3539	<code>XML_BUFFER_ALLOC_DOUBLEIT</code>, and can be set individually or on a
				3540	system wide basis using <code>xmlBufferSetAllocationScheme()</code>. A number
				3541	of functions allows to manipulate buffers with names starting with the
				3542	<code>xmlBuffer...</code> prefix.</p>
				3543
				3544	<h3><a name="Input">Input I/O handlers</a></h3>
				3545
				3546	<p>An Input I/O handler is a simple structure
				3547	<code>xmlParserInputBuffer</code> containing a context associated to the
				3548	resource (file descriptor, or pointer to a protocol handler), the read() and
				3549	close() callbacks to use and an xmlBuffer. And extra xmlBuffer and a charset
				3550	encoding handler are also present to support charset conversion when
				3551	needed.</p>
				3552
				3553	<h3><a name="Output">Output I/O handlers</a></h3>
				3554
				3555	<p>An Output handler <code>xmlOutputBuffer</code> is completely similar to an
				3556	Input one except the callbacks are write() and close().</p>
				3557
				3558	<h3><a name="entities">The entities loader</a></h3>
				3559
				3560	<p>The entity loader resolves requests for new entities and create inputs for
				3561	the parser. Creating an input from a filename or an URI string is done
				3562	through the xmlNewInputFromFile() routine. The default entity loader do not
				3563	handle the PUBLIC identifier associated with an entity (if any). So it just
				3564	calls xmlNewInputFromFile() with the SYSTEM identifier (which is mandatory in
				3565	XML).</p>
				3566
				3567	<p>If you want to hook up a catalog mechanism then you simply need to
				3568	override the default entity loader, here is an example:</p>
				3569	<pre>#include <libxml/xmlIO.h>
				3570
				3571	xmlExternalEntityLoader defaultLoader = NULL;
				3572
				3573	xmlParserInputPtr
				3574	xmlMyExternalEntityLoader(const char URL, const char ID,
				3575	xmlParserCtxtPtr ctxt) {
				3576	xmlParserInputPtr ret;
				3577	const char *fileID = NULL;
				3578	/* lookup for the fileID depending on ID */
				3579
				3580	ret = xmlNewInputFromFile(ctxt, fileID);
				3581	if (ret != NULL)
				3582	return(ret);
				3583	if (defaultLoader != NULL)
				3584	ret = defaultLoader(URL, ID, ctxt);
				3585	return(ret);
				3586	}
				3587
				3588	int main(..) {
				3589	...
				3590
				3591	/*
				3592	* Install our own entity loader
				3593	*/
				3594	defaultLoader = xmlGetExternalEntityLoader();
				3595	xmlSetExternalEntityLoader(xmlMyExternalEntityLoader);
				3596
				3597	...
				3598	}</pre>
				3599
				3600	<h3><a name="Example2">Example of customized I/O</a></h3>
				3601
				3602	<p>This example come from <a href="http://xmlsoft.org/messages/0708.html">a
				3603	real use case</a>, xmlDocDump() closes the FILE * passed by the application
				3604	and this was a problem. The <a
				3605	href="http://xmlsoft.org/messages/0711.html">solution</a> was to redefine a
				3606	new output handler with the closing call deactivated:</p>
				3607	<ol>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	3608	<li>First define a new I/O output allocator where the output don't close
				3609	the file:
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3610	<pre>xmlOutputBufferPtr
				3611	xmlOutputBufferCreateOwn(FILE *file, xmlCharEncodingHandlerPtr encoder) {
				3612	xmlOutputBufferPtr ret;
				3613
				3614	if (xmlOutputCallbackInitialized == 0)
				3615	xmlRegisterDefaultOutputCallbacks();
				3616
				3617	if (file == NULL) return(NULL);
				3618	ret = xmlAllocOutputBuffer(encoder);
				3619	if (ret != NULL) {
				3620	ret->context = file;
				3621	ret->writecallback = xmlFileWrite;
				3622	ret->closecallback = NULL; /* No close callback */
				3623	}
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	3624	return(ret);
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3625	} </pre>
				3626	</li>
				3627	<li>And then use it to save the document:
				3628	<pre>FILE *f;
				3629	xmlOutputBufferPtr output;
				3630	xmlDocPtr doc;
				3631	int res;
				3632
				3633	f = ...
				3634	doc = ....
				3635
				3636	output = xmlOutputBufferCreateOwn(f, NULL);
				3637	res = xmlSaveFileTo(output, doc, NULL);
				3638	</pre>
				3639	</li>
				3640	</ol>
				3641
				3642	<h2><a name="Catalog">Catalog support</a></h2>
				3643
				3644	<p>Table of Content:</p>
				3645	<ol>
				3646	<li><a href="General2">General overview</a></li>
				3647	<li><a href="#definition">The definition</a></li>
				3648	<li><a href="#Simple">Using catalogs</a></li>
				3649	<li><a href="#Some">Some examples</a></li>
				3650	<li><a href="#reference">How to tune catalog usage</a></li>
				3651	<li><a href="#validate">How to debug catalog processing</a></li>
				3652	<li><a href="#Declaring">How to create and maintain catalogs</a></li>
				3653	<li><a href="#implemento">The implementor corner quick review of the
				3654	API</a></li>
				3655	<li><a href="#Other">Other resources</a></li>
				3656	</ol>
				3657
				3658	<h3><a name="General2">General overview</a></h3>
				3659
				3660	<p>What is a catalog? Basically it's a lookup mechanism used when an entity
				3661	(a file or a remote resource) references another entity. The catalog lookup
				3662	is inserted between the moment the reference is recognized by the software
				3663	(XML parser, stylesheet processing, or even images referenced for inclusion
				3664	in a rendering) and the time where loading that resource is actually
				3665	started.</p>
				3666
				3667	<p>It is basically used for 3 things:</p>
				3668	<ul>
				3669	<li>mapping from "logical" names, the public identifiers and a more
				3670	concrete name usable for download (and URI). For example it can associate
				3671	the logical name
				3672	<p>"-//OASIS//DTD DocBook XML V4.1.2//EN"</p>
				3673	<p>of the DocBook 4.1.2 XML DTD with the actual URL where it can be
				3674	downloaded</p>
				3675	<p>http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd</p>
				3676	</li>
				3677	<li>remapping from a given URL to another one, like an HTTP indirection
				3678	saying that
				3679	<p>"http://www.oasis-open.org/committes/tr.xsl"</p>
				3680	<p>should really be looked at</p>
				3681	<p>"http://www.oasis-open.org/committes/entity/stylesheets/base/tr.xsl"</p>
				3682	</li>
				3683	<li>providing a local cache mechanism allowing to load the entities
				3684	associated to public identifiers or remote resources, this is a really
				3685	important feature for any significant deployment of XML or SGML since it
				3686	allows to avoid the aleas and delays associated to fetching remote
				3687	resources.</li>
				3688	</ul>
				3689
				3690	<h3><a name="definition">The definitions</a></h3>
				3691
				3692	<p>Libxml, as of 2.4.3 implements 2 kind of catalogs:</p>
				3693	<ul>
				3694	<li>the older SGML catalogs, the official spec is SGML Open Technical
				3695	Resolution TR9401:1997, but is better understood by reading <a
				3696	href="http://www.jclark.com/sp/catalog.htm">the SP Catalog page</a> from
				3697	James Clark. This is relatively old and not the preferred mode of
				3698	operation of libxml.</li>
				3699	<li><a href="http://www.oasis-open.org/committees/entity/spec.html">XML
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	3700	Catalogs</a> is far more flexible, more recent, uses an XML syntax and
				3701	should scale quite better. This is the default option of libxml.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3702	</ul>
				3703
				3704	<p></p>
				3705
				3706	<h3><a name="Simple">Using catalog</a></h3>
				3707
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3708	<p>In a normal environment libxml2 will by default check the presence of a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3709	catalog in /etc/xml/catalog, and assuming it has been correctly populated,
				3710	the processing is completely transparent to the document user. To take a
				3711	concrete example, suppose you are authoring a DocBook document, this one
				3712	starts with the following DOCTYPE definition:</p>
				3713	<pre><?xml version='1.0'?>
				3714	<!DOCTYPE book PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.4//EN"
				3715	"http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd"></pre>
				3716
				3717	<p>When validating the document with libxml, the catalog will be
				3718	automatically consulted to lookup the public identifier "-//Norman Walsh//DTD
				3719	DocBk XML V3.1.4//EN" and the system identifier
				3720	"http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd", and if these entities have
				3721	been installed on your system and the catalogs actually point to them, libxml
				3722	will fetch them from the local disk.</p>
				3723
				3724	<p style="font-size: 10pt"><strong>Note</strong>: Really don't use this
				3725	DOCTYPE example it's a really old version, but is fine as an example.</p>
				3726
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3727	<p>Libxml2 will check the catalog each time that it is requested to load an
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3728	entity, this includes DTD, external parsed entities, stylesheets, etc ... If
				3729	your system is correctly configured all the authoring phase and processing
				3730	should use only local files, even if your document stays portable because it
				3731	uses the canonical public and system ID, referencing the remote document.</p>
				3732
				3733	<h3><a name="Some">Some examples:</a></h3>
				3734
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3735	<p>Here is a couple of fragments from XML Catalogs used in libxml2 early
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3736	regression tests in <code>test/catalogs</code> :</p>
				3737	<pre><?xml version="1.0"?>
				3738	<!DOCTYPE catalog PUBLIC
				3739	"-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3740	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3741	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
				3742	<public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
				3743	uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
				3744	...</pre>
				3745
				3746	<p>This is the beginning of a catalog for DocBook 4.1.2, XML Catalogs are
				3747	written in XML, there is a specific namespace for catalog elements
				3748	"urn:oasis:names:tc:entity:xmlns:xml:catalog". The first entry in this
				3749	catalog is a <code>public</code> mapping it allows to associate a Public
				3750	Identifier with an URI.</p>
				3751	<pre>...
				3752	<rewriteSystem systemIdStartString="http://www.oasis-open.org/docbook/"
				3753	rewritePrefix="file:///usr/share/xml/docbook/"/>
				3754	...</pre>
				3755
				3756	<p>A <code>rewriteSystem</code> is a very powerful instruction, it says that
				3757	any URI starting with a given prefix should be looked at another URI
				3758	constructed by replacing the prefix with an new one. In effect this acts like
				3759	a cache system for a full area of the Web. In practice it is extremely useful
				3760	with a file prefix if you have installed a copy of those resources on your
				3761	local system.</p>
				3762	<pre>...
				3763	<delegatePublic publicIdStartString="-//OASIS//DTD XML Catalog //"
				3764	catalog="file:///usr/share/xml/docbook.xml"/>
				3765	<delegatePublic publicIdStartString="-//OASIS//ENTITIES DocBook XML"
				3766	catalog="file:///usr/share/xml/docbook.xml"/>
				3767	<delegatePublic publicIdStartString="-//OASIS//DTD DocBook XML"
				3768	catalog="file:///usr/share/xml/docbook.xml"/>
				3769	<delegateSystem systemIdStartString="http://www.oasis-open.org/docbook/"
				3770	catalog="file:///usr/share/xml/docbook.xml"/>
				3771	<delegateURI uriStartString="http://www.oasis-open.org/docbook/"
				3772	catalog="file:///usr/share/xml/docbook.xml"/>
				3773	...</pre>
				3774
				3775	<p>Delegation is the core features which allows to build a tree of catalogs,
				3776	easier to maintain than a single catalog, based on Public Identifier, System
				3777	Identifier or URI prefixes it instructs the catalog software to look up
				3778	entries in another resource. This feature allow to build hierarchies of
				3779	catalogs, the set of entries presented should be sufficient to redirect the
				3780	resolution of all DocBook references to the specific catalog in
				3781	<code>/usr/share/xml/docbook.xml</code> this one in turn could delegate all
				3782	references for DocBook 4.2.1 to a specific catalog installed at the same time
				3783	as the DocBook resources on the local machine.</p>
				3784
				3785	<h3><a name="reference">How to tune catalog usage:</a></h3>
				3786
				3787	<p>The user can change the default catalog behaviour by redirecting queries
				3788	to its own set of catalogs, this can be done by setting the
				3789	<code>XML_CATALOG_FILES</code> environment variable to a list of catalogs, an
				3790	empty one should deactivate loading the default <code>/etc/xml/catalog</code>
				3791	default catalog</p>
				3792
				3793	<h3><a name="validate">How to debug catalog processing:</a></h3>
				3794
				3795	<p>Setting up the <code>XML_DEBUG_CATALOG</code> environment variable will
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3796	make libxml2 output debugging informations for each catalog operations, for
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3797	example:</p>
				3798	<pre>orchis:~/XML -> xmllint --memory --noout test/ent2
				3799	warning: failed to load external entity "title.xml"
				3800	orchis:~/XML -> export XML_DEBUG_CATALOG=
				3801	orchis:~/XML -> xmllint --memory --noout test/ent2
				3802	Failed to parse catalog /etc/xml/catalog
				3803	Failed to parse catalog /etc/xml/catalog
				3804	warning: failed to load external entity "title.xml"
				3805	Catalogs cleanup
				3806	orchis:~/XML -> </pre>
				3807
				3808	<p>The test/ent2 references an entity, running the parser from memory makes
				3809	the base URI unavailable and the the "title.xml" entity cannot be loaded.
				3810	Setting up the debug environment variable allows to detect that an attempt is
				3811	made to load the <code>/etc/xml/catalog</code> but since it's not present the
				3812	resolution fails.</p>
				3813
				3814	<p>But the most advanced way to debug XML catalog processing is to use the
				3815	<strong>xmlcatalog</strong> command shipped with libxml2, it allows to load
				3816	catalogs and make resolution queries to see what is going on. This is also
				3817	used for the regression tests:</p>
				3818	<pre>orchis:~/XML -> ./xmlcatalog test/catalogs/docbook.xml \
				3819	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3820	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3821	orchis:~/XML -> </pre>
				3822
				3823	<p>For debugging what is going on, adding one -v flags increase the verbosity
				3824	level to indicate the processing done (adding a second flag also indicate
				3825	what elements are recognized at parsing):</p>
				3826	<pre>orchis:~/XML -> ./xmlcatalog -v test/catalogs/docbook.xml \
				3827	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3828	Parsing catalog test/catalogs/docbook.xml's content
				3829	Found public match -//OASIS//DTD DocBook XML V4.1.2//EN
				3830	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3831	Catalogs cleanup
				3832	orchis:~/XML -> </pre>
				3833
				3834	<p>A shell interface is also available to debug and process multiple queries
				3835	(and for regression tests):</p>
				3836	<pre>orchis:~/XML -> ./xmlcatalog -shell test/catalogs/docbook.xml \
				3837	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3838	> help
				3839	Commands available:
				3840	public PublicID: make a PUBLIC identifier lookup
				3841	system SystemID: make a SYSTEM identifier lookup
				3842	resolve PublicID SystemID: do a full resolver lookup
				3843	add 'type' 'orig' 'replace' : add an entry
				3844	del 'values' : remove values
				3845	dump: print the current catalog state
				3846	debug: increase the verbosity level
				3847	quiet: decrease the verbosity level
				3848	exit: quit the shell
				3849	> public "-//OASIS//DTD DocBook XML V4.1.2//EN"
				3850	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3851	> quit
				3852	orchis:~/XML -> </pre>
				3853
				3854	<p>This should be sufficient for most debugging purpose, this was actually
				3855	used heavily to debug the XML Catalog implementation itself.</p>
				3856
				3857	<h3><a name="Declaring">How to create and maintain</a> catalogs:</h3>
				3858
				3859	<p>Basically XML Catalogs are XML files, you can either use XML tools to
				3860	manage them or use <strong>xmlcatalog</strong> for this. The basic step is
				3861	to create a catalog the -create option provide this facility:</p>
				3862	<pre>orchis:~/XML -> ./xmlcatalog --create tst.xml
				3863	<?xml version="1.0"?>
				3864	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3865	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3866	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
				3867	orchis:~/XML -> </pre>
				3868
				3869	<p>By default xmlcatalog does not overwrite the original catalog and save the
				3870	result on the standard output, this can be overridden using the -noout
				3871	option. The <code>-add</code> command allows to add entries in the
				3872	catalog:</p>
				3873	<pre>orchis:~/XML -> ./xmlcatalog --noout --create --add "public" \
				3874	"-//OASIS//DTD DocBook XML V4.1.2//EN" \
				3875	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd tst.xml
				3876	orchis:~/XML -> cat tst.xml
				3877	<?xml version="1.0"?>
				3878	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" \
				3879	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3880	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
				3881	<public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
				3882	uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
				3883	</catalog>
				3884	orchis:~/XML -> </pre>
				3885
				3886	<p>The <code>-add</code> option will always take 3 parameters even if some of
				3887	the XML Catalog constructs (like nextCatalog) will have only a single
				3888	argument, just pass a third empty string, it will be ignored.</p>
				3889
				3890	<p>Similarly the <code>-del</code> option remove matching entries from the
				3891	catalog:</p>
				3892	<pre>orchis:~/XML -> ./xmlcatalog --del \
				3893	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" tst.xml
				3894	<?xml version="1.0"?>
				3895	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3896	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3897	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
				3898	orchis:~/XML -> </pre>
				3899
				3900	<p>The catalog is now empty. Note that the matching of <code>-del</code> is
				3901	exact and would have worked in a similar fashion with the Public ID
				3902	string.</p>
				3903
				3904	<p>This is rudimentary but should be sufficient to manage a not too complex
				3905	catalog tree of resources.</p>
				3906
				3907	<h3><a name="implemento">The implementor corner quick review of the
				3908	API:</a></h3>
				3909
				3910	<p>First, and like for every other module of libxml, there is an
				3911	automatically generated <a href="html/libxml-catalog.html">API page for
				3912	catalog support</a>.</p>
				3913
				3914	<p>The header for the catalog interfaces should be included as:</p>
				3915	<pre>#include <libxml/catalog.h></pre>
				3916
				3917	<p>The API is voluntarily kept very simple. First it is not obvious that
				3918	applications really need access to it since it is the default behaviour of
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	3919	libxml2 (Note: it is possible to completely override libxml2 default catalog
				3920	by using <a href="html/libxml-parser.html">xmlSetExternalEntityLoader</a> to
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3921	plug an application specific resolver).</p>
				3922
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3923	<p>Basically libxml2 support 2 catalog lists:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3924	<ul>
				3925	<li>the default one, global shared by all the application</li>
				3926	<li>a per-document catalog, this one is built if the document uses the
				3927	<code>oasis-xml-catalog</code> PIs to specify its own catalog list, it is
				3928	associated to the parser context and destroyed when the parsing context
				3929	is destroyed.</li>
				3930	</ul>
				3931
				3932	<p>the document one will be used first if it exists.</p>
				3933
				3934	<h4>Initialization routines:</h4>
				3935
				3936	<p>xmlInitializeCatalog(), xmlLoadCatalog() and xmlLoadCatalogs() should be
				3937	used at startup to initialize the catalog, if the catalog should be
				3938	initialized with specific values xmlLoadCatalog() or xmlLoadCatalogs()
				3939	should be called before xmlInitializeCatalog() which would otherwise do a
				3940	default initialization first.</p>
				3941
				3942	<p>The xmlCatalogAddLocal() call is used by the parser to grow the document
				3943	own catalog list if needed.</p>
				3944
				3945	<h4>Preferences setup:</h4>
				3946
				3947	<p>The XML Catalog spec requires the possibility to select default
				3948	preferences between public and system delegation,
				3949	xmlCatalogSetDefaultPrefer() allows this, xmlCatalogSetDefaults() and
				3950	xmlCatalogGetDefaults() allow to control if XML Catalogs resolution should
				3951	be forbidden, allowed for global catalog, for document catalog or both, the
				3952	default is to allow both.</p>
				3953
				3954	<p>And of course xmlCatalogSetDebug() allows to generate debug messages
				3955	(through the xmlGenericError() mechanism).</p>
				3956
				3957	<h4>Querying routines:</h4>
				3958
				3959	<p>xmlCatalogResolve(), xmlCatalogResolveSystem(), xmlCatalogResolvePublic()
				3960	and xmlCatalogResolveURI() are relatively explicit if you read the XML
				3961	Catalog specification they correspond to section 7 algorithms, they should
				3962	also work if you have loaded an SGML catalog with a simplified semantic.</p>
				3963
				3964	<p>xmlCatalogLocalResolve() and xmlCatalogLocalResolveURI() are the same but
				3965	operate on the document catalog list</p>
				3966
				3967	<h4>Cleanup and Miscellaneous:</h4>
				3968
				3969	<p>xmlCatalogCleanup() free-up the global catalog, xmlCatalogFreeLocal() is
				3970	the per-document equivalent.</p>
				3971
				3972	<p>xmlCatalogAdd() and xmlCatalogRemove() are used to dynamically modify the
				3973	first catalog in the global list, and xmlCatalogDump() allows to dump a
				3974	catalog state, those routines are primarily designed for xmlcatalog, I'm not
				3975	sure that exposing more complex interfaces (like navigation ones) would be
				3976	really useful.</p>
				3977
				3978	<p>The xmlParseCatalogFile() is a function used to load XML Catalog files,
				3979	it's similar as xmlParseFile() except it bypass all catalog lookups, it's
				3980	provided because this functionality may be useful for client tools.</p>
				3981
				3982	<h4>threaded environments:</h4>
				3983
				3984	<p>Since the catalog tree is built progressively, some care has been taken to
				3985	try to avoid troubles in multithreaded environments. The code is now thread
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	3986	safe assuming that the libxml2 library has been compiled with threads
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3987	support.</p>
				3988
				3989	<p></p>
				3990
				3991	<h3><a name="Other">Other resources</a></h3>
				3992
				3993	<p>The XML Catalog specification is relatively recent so there isn't much
				3994	literature to point at:</p>
				3995	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3996	<li>You can find a good rant from Norm Walsh about <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3997	href="http://www.arbortext.com/Think_Tank/XML_Resources/Issue_Three/issue_three.html">the
				3998	need for catalogs</a>, it provides a lot of context informations even if
Daniel Veillard	93d3a47	2002-04-26 14:04:55 +0000	[diff] [blame]	3999	I don't agree with everything presented. Norm also wrote a more recent
				4000	article <a
				4001	href="http://wwws.sun.com/software/xml/developers/resolver/article/">XML
				4002	entities and URI resolvers</a> describing them.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4003	<li>An <a href="http://home.ccil.org/~cowan/XML/XCatalog.html">old XML
				4004	catalog proposal</a> from John Cowan</li>
				4005	<li>The <a href="http://www.rddl.org/">Resource Directory Description
				4006	Language</a> (RDDL) another catalog system but more oriented toward
				4007	providing metadata for XML namespaces.</li>
				4008	<li>the page from the OASIS Technical <a
				4009	href="http://www.oasis-open.org/committees/entity/">Committee on Entity
				4010	Resolution</a> who maintains XML Catalog, you will find pointers to the
				4011	specification update, some background and pointers to others tools
				4012	providing XML Catalog support</li>
Daniel Veillard	abfca61	2004-01-07 23:38:02 +0000	[diff] [blame]	4013	<li>There is a <a href="buildDocBookCatalog">shell script</a> to generate
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	4014	XML Catalogs for DocBook 4.1.2 . If it can write to the /etc/xml/
				4015	directory, it will set-up /etc/xml/catalog and /etc/xml/docbook based on
				4016	the resources found on the system. Otherwise it will just create
				4017	~/xmlcatalog and ~/dbkxmlcatalog and doing:
Daniel Veillard	8594de9	2003-04-25 10:08:44 +0000	[diff] [blame]	4018	<p><code>export XML_CATALOG_FILES=$HOME/xmlcatalog</code></p>
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	4019	<p>should allow to process DocBook documentations without requiring
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4020	network accesses for the DTD or stylesheets</p>
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	4021	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4022	<li>I have uploaded <a href="ftp://xmlsoft.org/test/dbk412catalog.tar.gz">a
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	4023	small tarball</a> containing XML Catalogs for DocBook 4.1.2 which seems
				4024	to work fine for me too</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4025	<li>The <a href="http://www.xmlsoft.org/xmlcatalog_man.html">xmlcatalog
				4026	manual page</a></li>
				4027	</ul>
				4028
				4029	<p>If you have suggestions for corrections or additions, simply contact
				4030	me:</p>
				4031
				4032	<h2><a name="library">The parser interfaces</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4033
				4034	<p>This section is directly intended to help programmers getting bootstrapped
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4035	using the XML tollkit from the C language. It is not intended to be
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4036	extensive. I hope the automatically generated documents will provide the
				4037	completeness required, but as a separate set of documents. The interfaces of
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	4038	the XML parser are by principle low level, Those interested in a higher level
				4039	API should <a href="#DOM">look at DOM</a>.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	4040
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	4041	<p>The <a href="html/libxml-parser.html">parser interfaces for XML</a> are
				4042	separated from the <a href="html/libxml-htmlparser.html">HTML parser
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4043	interfaces</a>. Let's have a look at how the XML parser can be called:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4044
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4045	<h3><a name="Invoking">Invoking the parser : the pull method</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4046
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4047	<p>Usually, the first thing to do is to read an XML input. The parser accepts
				4048	documents either from in-memory strings or from files. The functions are
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4049	defined in "parser.h":</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4050	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4051	<dt><code>xmlDocPtr xmlParseMemory(char *buffer, int size);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4052	<dd><p>Parse a null-terminated string containing the document.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4053	</dd>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4054	</dl>
				4055	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4056	<dt><code>xmlDocPtr xmlParseFile(const char *filename);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4057	<dd><p>Parse an XML document contained in a (possibly compressed)
				4058	file.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4059	</dd>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4060	</dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4061
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4062	<p>The parser returns a pointer to the document structure (or NULL in case of
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4063	failure).</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4064
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4065	<h3 id="Invoking1">Invoking the parser: the push method</h3>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4066
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4067	<p>In order for the application to keep the control when the document is
Daniel Veillard	560c2a4	2003-07-06 21:13:49 +0000	[diff] [blame]	4068	being fetched (which is common for GUI based programs) libxml2 provides a
				4069	push interface, too, as of version 1.8.3. Here are the interface
				4070	functions:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4071	<pre>xmlParserCtxtPtr xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax,
				4072	void *user_data,
				4073	const char *chunk,
				4074	int size,
				4075	const char *filename);
				4076	int xmlParseChunk (xmlParserCtxtPtr ctxt,
				4077	const char *chunk,
				4078	int size,
				4079	int terminate);</pre>
				4080
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4081	<p>and here is a simple example showing how to use the interface:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4082	<pre> FILE *f;
				4083
				4084	f = fopen(filename, "r");
				4085	if (f != NULL) {
				4086	int res, size = 1024;
				4087	char chars[1024];
				4088	xmlParserCtxtPtr ctxt;
				4089
				4090	res = fread(chars, 1, 4, f);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4091	if (res > 0) {
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4092	ctxt = xmlCreatePushParserCtxt(NULL, NULL,
				4093	chars, res, filename);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4094	while ((res = fread(chars, 1, size, f)) > 0) {
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4095	xmlParseChunk(ctxt, chars, res, 0);
				4096	}
				4097	xmlParseChunk(ctxt, chars, 0, 1);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4098	doc = ctxt->myDoc;
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4099	xmlFreeParserCtxt(ctxt);
				4100	}
				4101	}</pre>
				4102
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4103	<p>The HTML parser embedded into libxml2 also has a push interface; the
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4104	functions are just prefixed by "html" rather than "xml".</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4105
				4106	<h3 id="Invoking2">Invoking the parser: the SAX interface</h3>
				4107
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4108	<p>The tree-building interface makes the parser memory-hungry, first loading
				4109	the document in memory and then building the tree itself. Reading a document
				4110	without building the tree is possible using the SAX interfaces (see SAX.h and
				4111	<a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">James
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4112	Henstridge's documentation</a>). Note also that the push interface can be
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4113	limited to SAX: just use the two first arguments of
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4114	<code>xmlCreatePushParserCtxt()</code>.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	4115
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4116	<h3><a name="Building">Building a tree from scratch</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4117
				4118	<p>The other way to get an XML tree in memory is by building it. Basically
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4119	there is a set of functions dedicated to building new elements. (These are
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4120	also described in <libxml/tree.h>.) For example, here is a piece of
				4121	code that produces the XML document used in the previous examples:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4122	<pre> #include <libxml/tree.h>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	4123	xmlDocPtr doc;
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4124	xmlNodePtr tree, subtree;
				4125
				4126	doc = xmlNewDoc("1.0");
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4127	doc->children = xmlNewDocNode(doc, NULL, "EXAMPLE", NULL);
				4128	xmlSetProp(doc->children, "prop1", "gnome is great");
				4129	xmlSetProp(doc->children, "prop2", "& linux too");
				4130	tree = xmlNewChild(doc->children, NULL, "head", NULL);
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4131	subtree = xmlNewChild(tree, NULL, "title", "Welcome to Gnome");
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4132	tree = xmlNewChild(doc->children, NULL, "chapter", NULL);
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4133	subtree = xmlNewChild(tree, NULL, "title", "The Linux adventure");
				4134	subtree = xmlNewChild(tree, NULL, "p", "bla bla bla ...");
				4135	subtree = xmlNewChild(tree, NULL, "image", NULL);
				4136	xmlSetProp(subtree, "href", "linus.gif");</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4137
				4138	<p>Not really rocket science ...</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4139
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4140	<h3><a name="Traversing">Traversing the tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4141
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	4142	<p>Basically by <a href="html/libxml-tree.html">including "tree.h"</a> your
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4143	code has access to the internal structure of all the elements of the tree.
				4144	The names should be somewhat simple like <strong>parent</strong>,
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	4145	<strong>children</strong>, <strong>next</strong>, <strong>prev</strong>,
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4146	<strong>properties</strong>, etc... For example, still with the previous
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	4147	example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4148	<pre><code>doc->children->children->children</code></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4149
				4150	<p>points to the title element,</p>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4151	<pre>doc->children->children->next->children->children</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4152
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4153	<p>points to the text node containing the chapter title "The Linux
				4154	adventure".</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4155
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	4156	<p><strong>NOTE</strong>: XML allows <em>PI</em>s and <em>comments</em> to be
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4157	present before the document root, so <code>doc->children</code> may point
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4158	to an element which is not the document Root Element; a function
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	4159	<code>xmlDocGetRootElement()</code> was added for this purpose.</p>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	4160
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4161	<h3><a name="Modifying">Modifying the tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4162
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4163	<p>Functions are provided for reading and writing the document content. Here
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	4164	is an excerpt from the <a href="html/libxml-tree.html">tree API</a>:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4165	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	4166	<dt><code>xmlAttrPtr xmlSetProp(xmlNodePtr node, const xmlChar *name, const
				4167	xmlChar *value);</code></dt>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4168	<dd><p>This sets (or changes) an attribute carried by an ELEMENT node.
				4169	The value can be NULL.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4170	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4171	</dl>
				4172	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	4173	<dt><code>const xmlChar *xmlGetProp(xmlNodePtr node, const xmlChar
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4174	*name);</code></dt>
Daniel Veillard	c92c304	2000-09-29 02:42:04 +0000	[diff] [blame]	4175	<dd><p>This function returns a pointer to new copy of the property
				4176	content. Note that the user must deallocate the result.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4177	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4178	</dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4179
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4180	<p>Two functions are provided for reading and writing the text associated
				4181	with elements:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4182	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	4183	<dt><code>xmlNodePtr xmlStringGetNodeList(xmlDocPtr doc, const xmlChar
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4184	*value);</code></dt>
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4185	<dd><p>This function takes an "external" string and converts it to one
				4186	text node or possibly to a list of entity and text nodes. All
				4187	non-predefined entity references like &Gnome; will be stored
				4188	internally as entity nodes, hence the result of the function may not be
				4189	a single node.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4190	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4191	</dl>
				4192	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	4193	<dt><code>xmlChar *xmlNodeListGetString(xmlDocPtr doc, xmlNodePtr list, int
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4194	inLine);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4195	<dd><p>This function is the inverse of
				4196	<code>xmlStringGetNodeList()</code>. It generates a new string
				4197	containing the content of the text and entity nodes. Note the extra
				4198	argument inLine. If this argument is set to 1, the function will expand
				4199	entity references. For example, instead of returning the &Gnome;
				4200	XML encoding in the string, it will substitute it with its value (say,
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4201	"GNU Network Object Model Environment").</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4202	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4203	</dl>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4204
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4205	<h3><a name="Saving">Saving a tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4206
				4207	<p>Basically 3 options are possible:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4208	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	4209	<dt><code>void xmlDocDumpMemory(xmlDocPtr cur, xmlChar**mem, int
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4210	*size);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4211	<dd><p>Returns a buffer into which the document has been saved.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4212	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4213	</dl>
				4214	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4215	<dt><code>extern void xmlDocDump(FILE *f, xmlDocPtr doc);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4216	<dd><p>Dumps a document to an open file descriptor.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4217	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4218	</dl>
				4219	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4220	<dt><code>int xmlSaveFile(const char *filename, xmlDocPtr cur);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4221	<dd><p>Saves the document to a file. In this case, the compression
				4222	interface is triggered if it has been turned on.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4223	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4224	</dl>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	4225
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4226	<h3><a name="Compressio">Compression</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4227
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4228	<p>The library transparently handles compression when doing file-based
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4229	accesses. The level of compression on saves can be turned on either globally
				4230	or individually for one file:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4231	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4232	<dt><code>int xmlGetDocCompressMode (xmlDocPtr doc);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4233	<dd><p>Gets the document compression ratio (0-9).</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4234	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4235	</dl>
				4236	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4237	<dt><code>void xmlSetDocCompressMode (xmlDocPtr doc, int mode);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4238	<dd><p>Sets the document compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4239	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4240	</dl>
				4241	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4242	<dt><code>int xmlGetCompressMode(void);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4243	<dd><p>Gets the default compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4244	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4245	</dl>
				4246	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4247	<dt><code>void xmlSetCompressMode(int mode);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4248	<dd><p>Sets the default compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4249	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	4250	</dl>
				4251
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4252	<h2><a name="Entities">Entities or no entities</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4253
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4254	<p>Entities in principle are similar to simple C macros. An entity defines an
				4255	abbreviation for a given string that you can reuse many times throughout the
				4256	content of your document. Entities are especially useful when a given string
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4257	may occur frequently within a document, or to confine the change needed to a
				4258	document to a restricted area in the internal subset of the document (at the
				4259	beginning). Example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4260	<pre>1 <?xml version="1.0"?>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4261	2 <!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4262	3 <!ENTITY xml "Extensible Markup Language">
				4263	4 ]>
				4264	5 <EXAMPLE>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4265	6 &xml;
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4266	7 </EXAMPLE></pre>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4267
				4268	<p>Line 3 declares the xml entity. Line 6 uses the xml entity, by prefixing
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4269	its name with '&' and following it by ';' without any spaces added. There
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4270	are 5 predefined entities in libxml2 allowing you to escape characters with
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4271	predefined meaning in some parts of the xml document content:
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4272	<strong>&lt;</strong> for the character '<', <strong>&gt;</strong>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4273	for the character '>', <strong>&apos;</strong> for the character ''',
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4274	<strong>&quot;</strong> for the character '"', and
				4275	<strong>&amp;</strong> for the character '&'.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4276
				4277	<p>One of the problems related to entities is that you may want the parser to
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4278	substitute an entity's content so that you can see the replacement text in
				4279	your application. Or you may prefer to keep entity references as such in the
				4280	content to be able to save the document back without losing this usually
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4281	precious information (if the user went through the pain of explicitly
				4282	defining entities, he may have a a rather negative attitude if you blindly
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4283	substitute them as saving time). The <a
Daniel Veillard	5373ea1	2003-07-24 13:09:13 +0000	[diff] [blame]	4284	href="html/libxml-parser.html#xmlSubstituteEntitiesDefault">xmlSubstituteEntitiesDefault()</a>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4285	function allows you to check and change the behaviour, which is to not
				4286	substitute entities by default.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4287
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4288	<p>Here is the DOM tree built by libxml2 for the previous document in the
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4289	default case:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4290	<pre>/gnome/src/gnome-xml -> ./xmllint --debug test/ent1
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4291	DOCUMENT
				4292	version=1.0
				4293	ELEMENT EXAMPLE
				4294	TEXT
				4295	content=
				4296	ENTITY_REF
				4297	INTERNAL_GENERAL_ENTITY xml
				4298	content=Extensible Markup Language
				4299	TEXT
				4300	content=</pre>
				4301
				4302	<p>And here is the result when substituting entities:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4303	<pre>/gnome/src/gnome-xml -> ./tester --debug --noent test/ent1
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4304	DOCUMENT
				4305	version=1.0
				4306	ELEMENT EXAMPLE
				4307	TEXT
				4308	content= Extensible Markup Language</pre>
				4309
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4310	<p>So, entities or no entities? Basically, it depends on your use case. I
				4311	suggest that you keep the non-substituting default behaviour and avoid using
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4312	entities in your XML document or data if you are not willing to handle the
				4313	entity references elements in the DOM tree.</p>
				4314
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4315	<p>Note that at save time libxml2 enforces the conversion of the predefined
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4316	entities where necessary to prevent well-formedness problems, and will also
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4317	transparently replace those with chars (i.e. it will not generate entity
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4318	reference elements in the DOM tree or call the reference() SAX callback when
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4319	finding them in the input).</p>
				4320
Daniel Veillard	7b9c4b7	2000-08-25 16:26:50 +0000	[diff] [blame]	4321	<p><span style="background-color: #FF0000">WARNING</span>: handling entities
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4322	on top of the libxml2 SAX interface is difficult!!! If you plan to use
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4323	non-predefined entities in your documents, then the learning curve to handle
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4324	then using the SAX API may be long. If you plan to use complex documents, I
Daniel Veillard	7b9c4b7	2000-08-25 16:26:50 +0000	[diff] [blame]	4325	strongly suggest you consider using the DOM interface instead and let libxml
Daniel Veillard	8c6d6af	2000-08-25 17:14:13 +0000	[diff] [blame]	4326	deal with the complexity rather than trying to do it yourself.</p>
Daniel Veillard	7b9c4b7	2000-08-25 16:26:50 +0000	[diff] [blame]	4327
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	4328	<h2><a name="Namespaces">Namespaces</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4329
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4330	<p>The libxml2 library implements <a
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	4331	href="http://www.w3.org/TR/REC-xml-names/">XML namespaces</a> support by
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4332	recognizing namespace constructs in the input, and does namespace lookup
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	4333	automatically when building the DOM tree. A namespace declaration is
				4334	associated with an in-memory structure and all elements or attributes within
				4335	that namespace point to it. Hence testing the namespace is a simple and fast
				4336	equality operation at the user level.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4337
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4338	<p>I suggest that people using libxml2 use a namespace, and declare it in the
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4339	root element of their document as the default namespace. Then they don't need
				4340	to use the prefix in the content but we will have a basis for future semantic
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4341	refinement and merging of data from different sources. This doesn't increase
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4342	the size of the XML output significantly, but significantly increases its
				4343	value in the long-term. Example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4344	<pre><mydoc xmlns="http://mydoc.example.org/schemas/">
				4345	<elem1>...</elem1>
				4346	<elem2>...</elem2>
				4347	</mydoc></pre>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4348
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4349	<p>The namespace value has to be an absolute URL, but the URL doesn't have to
				4350	point to any existing resource on the Web. It will bind all the element and
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	4351	attributes with that URL. I suggest to use an URL within a domain you
				4352	control, and that the URL should contain some kind of version information if
				4353	possible. For example, <code>"http://www.gnome.org/gnumeric/1.0/"</code> is a
				4354	good namespace scheme.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	4355
				4356	<p>Then when you load a file, make sure that a namespace carrying the
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	4357	version-independent prefix is installed on the root element of your document,
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4358	and if the version information don't match something you know, warn the user
				4359	and be liberal in what you accept as the input. Also do not try to base
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4360	namespace checking on the prefix value. <foo:text> may be exactly the
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4361	same as <bar:text> in another document. What really matters is the URI
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4362	associated with the element or the attribute, not the prefix string (which is
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4363	just a shortcut for the full URI). In libxml, element and attributes have an
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	4364	<code>ns</code> field pointing to an xmlNs structure detailing the namespace
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4365	prefix and its URI.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4366
				4367	<p>@@Interfaces@@</p>
Daniel Veillard	3e35f8e	2003-10-21 00:05:38 +0000	[diff] [blame]	4368	<pre>xmlNodePtr node;
Daniel Veillard	fc8dc35	2003-10-18 09:07:46 +0000	[diff] [blame]	4369	if(!strncmp(node->name,"mytag",5)
				4370	&& node->ns
				4371	&& !strcmp(node->ns->href,"http://www.mysite.com/myns/1.0")) {
				4372	...
Daniel Veillard	3e35f8e	2003-10-21 00:05:38 +0000	[diff] [blame]	4373	}</pre>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4374
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4375	<p>Usually people object to using namespaces together with validity checking.
				4376	I will try to make sure that using namespaces won't break validity checking,
				4377	so even if you plan to use or currently are using validation I strongly
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	4378	suggest adding namespaces to your document. A default namespace scheme
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4379	<code>xmlns="http://...."</code> should not break validity even on less
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4380	flexible parsers. Using namespaces to mix and differentiate content coming
Daniel Veillard	3e35f8e	2003-10-21 00:05:38 +0000	[diff] [blame]	4381	from multiple DTDs will certainly break current validation schemes. To check
				4382	such documents one needs to use schema-validation, which is supported in
				4383	libxml2 as well. See <a href="http://www.relaxng.org/">relagx-ng</a> and <a
				4384	href="http://www.w3c.org/XML/Schema">w3c-schema</a>.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4385
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4386	<h2><a name="Upgrading">Upgrading 1.x code</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4387
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4388	<p>Incompatible changes:</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4389
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4390	<p>Version 2 of libxml2 is the first version introducing serious backward
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4391	incompatible changes. The main goals were:</p>
				4392	<ul>
				4393	<li>a general cleanup. A number of mistakes inherited from the very early
				4394	versions couldn't be changed due to compatibility constraints. Example
				4395	the "childs" element in the nodes.</li>
				4396	<li>Uniformization of the various nodes, at least for their header and link
				4397	parts (doc, parent, children, prev, next), the goal is a simpler
				4398	programming model and simplifying the task of the DOM implementors.</li>
				4399	<li>better conformances to the XML specification, for example version 1.x
				4400	had an heuristic to try to detect ignorable white spaces. As a result the
				4401	SAX event generated were ignorableWhitespace() while the spec requires
				4402	character() in that case. This also mean that a number of DOM node
				4403	containing blank text may populate the DOM tree which were not present
				4404	before.</li>
				4405	</ul>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4406
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4407	<h3>How to fix libxml-1.x code:</h3>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4408
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4409	<p>So client code of libxml designed to run with version 1.x may have to be
				4410	changed to compile against version 2.x of libxml. Here is a list of changes
				4411	that I have collected, they may not be sufficient, so in case you find other
Daniel Veillard	fc8dc35	2003-10-18 09:07:46 +0000	[diff] [blame]	4412	change which are required, <a href="mailto:Daniel.Veillard@w3.org">drop me a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4413	mail</a>:</p>
				4414	<ol>
				4415	<li>The package name have changed from libxml to libxml2, the library name
				4416	is now -lxml2 . There is a new xml2-config script which should be used to
				4417	select the right parameters libxml2</li>
				4418	<li>Node <strong>childs</strong> field has been renamed
				4419	<strong>children</strong> so s/childs/children/g should be applied
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4420	(probability of having "childs" anywhere else is close to 0+</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4421	<li>The document don't have anymore a <strong>root</strong> element it has
				4422	been replaced by <strong>children</strong> and usually you will get a
				4423	list of element here. For example a Dtd element for the internal subset
				4424	and it's declaration may be found in that list, as well as processing
				4425	instructions or comments found before or after the document root element.
				4426	Use <strong>xmlDocGetRootElement(doc)</strong> to get the root element of
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4427	a document. Alternatively if you are sure to not reference DTDs nor have
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4428	PIs or comments before or after the root element
				4429	s/->root/->children/g will probably do it.</li>
				4430	<li>The white space issue, this one is more complex, unless special case of
				4431	validating parsing, the line breaks and spaces usually used for indenting
				4432	and formatting the document content becomes significant. So they are
				4433	reported by SAX and if your using the DOM tree, corresponding nodes are
				4434	generated. Too approach can be taken:
				4435	<ol>
				4436	<li>lazy one, use the compatibility call
				4437	<strong>xmlKeepBlanksDefault(0)</strong> but be aware that you are
				4438	relying on a special (and possibly broken) set of heuristics of
				4439	libxml to detect ignorable blanks. Don't complain if it breaks or
				4440	make your application not 100% clean w.r.t. to it's input.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4441	<li>the Right Way: change you code to accept possibly insignificant
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4442	blanks characters, or have your tree populated with weird blank text
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4443	nodes. You can spot them using the commodity function
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4444	<strong>xmlIsBlankNode(node)</strong> returning 1 for such blank
				4445	nodes.</li>
				4446	</ol>
				4447	<p>Note also that with the new default the output functions don't add any
				4448	extra indentation when saving a tree in order to be able to round trip
				4449	(read and save) without inflating the document with extra formatting
				4450	chars.</p>
				4451	</li>
				4452	<li>The include path has changed to $prefix/libxml/ and the includes
				4453	themselves uses this new prefix in includes instructions... If you are
				4454	using (as expected) the
				4455	<pre>xml2-config --cflags</pre>
				4456	<p>output to generate you compile commands this will probably work out of
				4457	the box</p>
				4458	</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4459	<li>xmlDetectCharEncoding takes an extra argument indicating the length in
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4460	byte of the head of the document available for character detection.</li>
				4461	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4462
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4463	<h3>Ensuring both libxml-1.x and libxml-2.x compatibility</h3>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4464
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4465	<p>Two new version of libxml (1.8.11) and libxml2 (2.3.4) have been released
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4466	to allow smooth upgrade of existing libxml v1code while retaining
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4467	compatibility. They offers the following:</p>
				4468	<ol>
				4469	<li>similar include naming, one should use
				4470	<strong>#include<libxml/...></strong> in both cases.</li>
				4471	<li>similar identifiers defined via macros for the child and root fields:
				4472	respectively <strong>xmlChildrenNode</strong> and
				4473	<strong>xmlRootNode</strong></li>
				4474	<li>a new macro <strong>LIBXML_TEST_VERSION</strong> which should be
				4475	inserted once in the client code</li>
				4476	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4477
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4478	<p>So the roadmap to upgrade your existing libxml applications is the
				4479	following:</p>
				4480	<ol>
				4481	<li>install the libxml-1.8.8 (and libxml-devel-1.8.8) packages</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4482	<li>find all occurrences where the xmlDoc <strong>root</strong> field is
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4483	used and change it to <strong>xmlRootNode</strong></li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	4484	<li>similarly find all occurrences where the xmlNode
				4485	<strong>childs</strong> field is used and change it to
				4486	<strong>xmlChildrenNode</strong></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4487	<li>add a <strong>LIBXML_TEST_VERSION</strong> macro somewhere in your
				4488	<strong>main()</strong> or in the library init entry point</li>
				4489	<li>Recompile, check compatibility, it should still work</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	4490	<li>Change your configure script to look first for xml2-config and fall
				4491	back using xml-config . Use the --cflags and --libs output of the command
				4492	as the Include and Linking parameters needed to use libxml.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4493	<li>install libxml2-2.3.x and libxml2-devel-2.3.x (libxml-1.8.y and
				4494	libxml-devel-1.8.y can be kept simultaneously)</li>
				4495	<li>remove your config.cache, relaunch your configuration mechanism, and
				4496	recompile, if steps 2 and 3 were done right it should compile as-is</li>
				4497	<li>Test that your application is still running correctly, if not this may
				4498	be due to extra empty nodes due to formating spaces being kept in libxml2
				4499	contrary to libxml1, in that case insert xmlKeepBlanksDefault(1) in your
				4500	code before calling the parser (next to
				4501	<strong>LIBXML_TEST_VERSION</strong> is a fine place).</li>
				4502	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4503
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4504	<p>Following those steps should work. It worked for some of my own code.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4505
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4506	<p>Let me put some emphasis on the fact that there is far more changes from
				4507	libxml 1.x to 2.x than the ones you may have to patch for. The overall code
				4508	has been considerably cleaned up and the conformance to the XML specification
				4509	has been drastically improved too. Don't take those changes as an excuse to
				4510	not upgrade, it may cost a lot on the long term ...</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4511
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	4512	<h2><a name="Thread">Thread safety</a></h2>
				4513
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4514	<p>Starting with 2.4.7, libxml2 makes provisions to ensure that concurrent
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	4515	threads can safely work in parallel parsing different documents. There is
				4516	however a couple of things to do to ensure it:</p>
				4517	<ul>
				4518	<li>configure the library accordingly using the --with-threads options</li>
				4519	<li>call xmlInitParser() in the "main" thread before using any of the
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4520	libxml2 API (except possibly selecting a different memory allocator)</li>
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	4521	</ul>
				4522
				4523	<p>Note that the thread safety cannot be ensured for multiple threads sharing
				4524	the same document, the locking must be done at the application level, libxml
				4525	exports a basic mutex and reentrant mutexes API in <libxml/threads.h>.
				4526	The parts of the library checked for thread safety are:</p>
				4527	<ul>
				4528	<li>concurrent loading</li>
				4529	<li>file access resolution</li>
				4530	<li>catalog access</li>
				4531	<li>catalog building</li>
				4532	<li>entities lookup/accesses</li>
				4533	<li>validation</li>
				4534	<li>global variables per-thread override</li>
				4535	<li>memory handling</li>
				4536	</ul>
				4537
				4538	<p>XPath is supposed to be thread safe now, but this wasn't tested
				4539	seriously.</p>
				4540
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	4541	<h2><a name="DOM"></a><a name="Principles">DOM Principles</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4542
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4543	<p><a href="http://www.w3.org/DOM/">DOM</a> stands for the <em>Document
				4544	Object Model</em>; this is an API for accessing XML or HTML structured
				4545	documents. Native support for DOM in Gnome is on the way (module gnome-dom),
				4546	and will be based on gnome-xml. This will be a far cleaner interface to
				4547	manipulate XML files within Gnome since it won't expose the internal
				4548	structure.</p>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4549
Daniel Veillard	8a46917	2003-06-12 16:05:07 +0000	[diff] [blame]	4550	<p>The current DOM implementation on top of libxml2 is the <a
Daniel Veillard	a47fb3d	2001-03-25 17:23:49 +0000	[diff] [blame]	4551	href="http://cvs.gnome.org/lxr/source/gdome2/">gdome2 Gnome module</a>, this
				4552	is a full DOM interface, thanks to Paolo Casarini, check the <a
				4553	href="http://www.cs.unibo.it/~casarini/gdome2/">Gdome2 homepage</a> for more
				4554	informations.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4555
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	4556	<h2><a name="Example"></a><a name="real">A real example</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4557
				4558	<p>Here is a real size example, where the actual content of the application
				4559	data is not kept in the DOM tree but uses internal structures. It is based on
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4560	a proposal to keep a database of jobs related to Gnome, with an XML based
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4561	storage structure. Here is an <a href="gjobs.xml">XML encoded jobs
				4562	base</a>:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4563	<pre><?xml version="1.0"?>
				4564	<gjob:Helping xmlns:gjob="http://www.gnome.org/some-location">
				4565	<gjob:Jobs>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4566
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4567	<gjob:Job>
				4568	<gjob:Project ID="3"/>
				4569	<gjob:Application>GBackup</gjob:Application>
				4570	<gjob:Category>Development</gjob:Category>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4571
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4572	<gjob:Update>
				4573	<gjob:Status>Open</gjob:Status>
				4574	<gjob:Modified>Mon, 07 Jun 1999 20:27:45 -0400 MET DST</gjob:Modified>
				4575	<gjob:Salary>USD 0.00</gjob:Salary>
				4576	</gjob:Update>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4577
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4578	<gjob:Developers>
				4579	<gjob:Developer>
				4580	</gjob:Developer>
				4581	</gjob:Developers>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4582
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4583	<gjob:Contact>
				4584	<gjob:Person>Nathan Clemons</gjob:Person>
				4585	<gjob:Email>nathan@windsofstorm.net</gjob:Email>
				4586	<gjob:Company>
				4587	</gjob:Company>
				4588	<gjob:Organisation>
				4589	</gjob:Organisation>
				4590	<gjob:Webpage>
				4591	</gjob:Webpage>
				4592	<gjob:Snailmail>
				4593	</gjob:Snailmail>
				4594	<gjob:Phone>
				4595	</gjob:Phone>
				4596	</gjob:Contact>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4597
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4598	<gjob:Requirements>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4599	The program should be released as free software, under the GPL.
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4600	</gjob:Requirements>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4601
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4602	<gjob:Skills>
				4603	</gjob:Skills>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4604
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4605	<gjob:Details>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4606	A GNOME based system that will allow a superuser to configure
				4607	compressed and uncompressed files and/or file systems to be backed
				4608	up with a supported media in the system. This should be able to
				4609	perform via find commands generating a list of files that are passed
				4610	to tar, dd, cpio, cp, gzip, etc., to be directed to the tape machine
				4611	or via operations performed on the filesystem itself. Email
				4612	notification and GUI status display very important.
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4613	</gjob:Details>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4614
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4615	</gjob:Job>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4616
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4617	</gjob:Jobs>
				4618	</gjob:Helping></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4619
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4620	<p>While loading the XML file into an internal DOM tree is a matter of
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4621	calling only a couple of functions, browsing the tree to gather the data and
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4622	generate the internal structures is harder, and more error prone.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4623
				4624	<p>The suggested principle is to be tolerant with respect to the input
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4625	structure. For example, the ordering of the attributes is not significant,
				4626	the XML specification is clear about it. It's also usually a good idea not to
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4627	depend on the order of the children of a given node, unless it really makes
				4628	things harder. Here is some code to parse the information for a person:</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4629	<pre>/*
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4630	* A person record
				4631	*/
				4632	typedef struct person {
				4633	char *name;
				4634	char *email;
				4635	char *company;
				4636	char *organisation;
				4637	char *smail;
				4638	char *webPage;
				4639	char *phone;
				4640	} person, *personPtr;
				4641
				4642	/*
				4643	* And the code needed to parse it
				4644	*/
				4645	personPtr parsePerson(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
				4646	personPtr ret = NULL;
				4647
				4648	DEBUG("parsePerson\n");
				4649	/*
				4650	* allocate the struct
				4651	*/
				4652	ret = (personPtr) malloc(sizeof(person));
				4653	if (ret == NULL) {
				4654	fprintf(stderr,"out of memory\n");
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4655	return(NULL);
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4656	}
				4657	memset(ret, 0, sizeof(person));
				4658
				4659	/* We don't care what the top level element name is */
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4660	cur = cur->xmlChildrenNode;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4661	while (cur != NULL) {
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4662	if ((!strcmp(cur->name, "Person")) && (cur->ns == ns))
				4663	ret->name = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4664	if ((!strcmp(cur->name, "Email")) && (cur->ns == ns))
				4665	ret->email = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4666	cur = cur->next;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4667	}
				4668
				4669	return(ret);
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4670	}</pre>
				4671
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4672	<p>Here are a couple of things to notice:</p>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4673	<ul>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	4674	<li>Usually a recursive parsing style is the more convenient one: XML data
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4675	is by nature subject to repetitive constructs and usually exhibits highly
				4676	structured patterns.</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4677	<li>The two arguments of type <em>xmlDocPtr</em> and <em>xmlNsPtr</em>,
				4678	i.e. the pointer to the global XML document and the namespace reserved to
				4679	the application. Document wide information are needed for example to
				4680	decode entities and it's a good coding practice to define a namespace for
				4681	your application set of data and test that the element and attributes
				4682	you're analyzing actually pertains to your application space. This is
				4683	done by a simple equality test (cur->ns == ns).</li>
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4684	<li>To retrieve text and attributes value, you can use the function
				4685	<em>xmlNodeListGetString</em> to gather all the text and entity reference
				4686	nodes generated by the DOM output and produce an single text string.</li>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4687	</ul>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4688
				4689	<p>Here is another piece of code used to parse another level of the
				4690	structure:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4691	<pre>#include <libxml/tree.h>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	4692	/*
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4693	* a Description for a Job
				4694	*/
				4695	typedef struct job {
				4696	char *projectID;
				4697	char *application;
				4698	char *category;
				4699	personPtr contact;
				4700	int nbDevelopers;
				4701	personPtr developers[100]; /* using dynamic alloc is left as an exercise */
				4702	} job, *jobPtr;
				4703
				4704	/*
				4705	* And the code needed to parse it
				4706	*/
				4707	jobPtr parseJob(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
				4708	jobPtr ret = NULL;
				4709
				4710	DEBUG("parseJob\n");
				4711	/*
				4712	* allocate the struct
				4713	*/
				4714	ret = (jobPtr) malloc(sizeof(job));
				4715	if (ret == NULL) {
				4716	fprintf(stderr,"out of memory\n");
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4717	return(NULL);
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4718	}
				4719	memset(ret, 0, sizeof(job));
				4720
				4721	/* We don't care what the top level element name is */
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4722	cur = cur->xmlChildrenNode;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4723	while (cur != NULL) {
				4724
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4725	if ((!strcmp(cur->name, "Project")) && (cur->ns == ns)) {
				4726	ret->projectID = xmlGetProp(cur, "ID");
				4727	if (ret->projectID == NULL) {
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4728	fprintf(stderr, "Project has no ID\n");
				4729	}
				4730	}
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4731	if ((!strcmp(cur->name, "Application")) && (cur->ns == ns))
				4732	ret->application = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4733	if ((!strcmp(cur->name, "Category")) && (cur->ns == ns))
				4734	ret->category = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4735	if ((!strcmp(cur->name, "Contact")) && (cur->ns == ns))
				4736	ret->contact = parsePerson(doc, ns, cur);
				4737	cur = cur->next;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4738	}
				4739
				4740	return(ret);
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4741	}</pre>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4742
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4743	<p>Once you are used to it, writing this kind of code is quite simple, but
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4744	boring. Ultimately, it could be possible to write stubbers taking either C
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4745	data structure definitions, a set of XML examples or an XML DTD and produce
				4746	the code needed to import and export the content between C data and XML
				4747	storage. This is left as an exercise to the reader :-)</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4748
Daniel Veillard	6f0adb5	2000-07-03 11:41:26 +0000	[diff] [blame]	4749	<p>Feel free to use <a href="example/gjobread.c">the code for the full C
				4750	parsing example</a> as a template, it is also available with Makefile in the
				4751	Gnome CVS base under gnome-xml/example</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4752
Daniel Veillard	c310d56	2000-06-23 18:32:15 +0000	[diff] [blame]	4753	<h2><a name="Contributi">Contributions</a></h2>
				4754	<ul>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4755	<li>Bjorn Reese, William Brack and Thomas Broyer have provided a number of
				4756	patches, Gary Pennington worked on the validation API, threading support
				4757	and Solaris port.</li>
				4758	<li>John Fleck helps maintaining the documentation and man pages.</li>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	4759	<li><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a> is now the
				4760	maintainer of the Windows port, <a
				4761	href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
				4762	binaries</a></li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4763	<li><a href="mailto:Gary.Pennington@sun.com">Gary Pennington</a> provides
				4764	<a href="http://garypennington.net/libxml2/">Solaris binaries</a></li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	4765	<li><a
				4766	href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4767	Sergeant</a> developed <a
				4768	href="http://axkit.org/download/">XML::LibXSLT</a>, a Perl wrapper for
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4769	libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML
				4770	application server</a></li>
				4771	<li><a href="mailto:fnatter@gmx.net">Felix Natter</a> and <a
				4772	href="mailto:geertk@ai.rug.nl">Geert Kloosterman</a> provide <a
Daniel Veillard	ca98976	2001-06-23 17:39:29 +0000	[diff] [blame]	4773	href="libxml-doc.el">an emacs module</a> to lookup libxml(2) functions
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	4774	documentation</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4775	<li><a href="mailto:sherwin@nlm.nih.gov">Ziying Sherwin</a> provided <a
				4776	href="http://xmlsoft.org/messages/0488.html">man pages</a></li>
Daniel Veillard	5168dbf	2001-07-07 00:18:23 +0000	[diff] [blame]	4777	<li>there is a module for <a
				4778	href="http://acs-misc.sourceforge.net/nsxml.html">libxml/libxslt support
				4779	in OpenNSD/AOLServer</a></li>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	4780	<li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provided the
				4781	first version of libxml/libxslt <a
				4782	href="http://www.rexx.com/~dkuhlman">wrappers for Python</a></li>
Daniel Veillard	1aadc44	2001-11-28 13:10:32 +0000	[diff] [blame]	4783	<li>Petr Kozelka provides <a
				4784	href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
				4785	libxml2</a> with Kylix and Delphi and other Pascal compilers</li>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	4786	<li><a href="mailto:aleksey@aleksey.com">Aleksey Sanin</a> implemented the
				4787	<a href="http://www.w3.org/Signature/">XML Canonicalization and XML
				4788	Digital Signature</a> <a
				4789	href="http://www.aleksey.com/xmlsec/">implementations for libxml2</a></li>
Daniel Veillard	d49370e	2005-04-11 23:28:16 +0000	[diff] [blame]	4790	<li><a href="mailto:Steve.Ball@explain.com.au">Steve Ball</a>
				4791	and contributors maintain <a
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	4792	href="http://tclxml.sourceforge.net/">tcl bindings for libxml2 and
				4793	libxslt</a>, as well as <a
				4794	href="http://tclxml.sf.net/tkxmllint.html">tkxmllint</a> a GUI for
				4795	xmllint and <a href="http://tclxml.sf.net/tkxsltproc.html">tkxsltproc</a>
				4796	a GUI for xsltproc.</li>
Daniel Veillard	c310d56	2000-06-23 18:32:15 +0000	[diff] [blame]	4797	</ul>
				4798
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4799	<p></p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	4800	</body>
				4801	</html>