Blame - doc/xml.html - platform/external/libxml2

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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	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	5	<title>The XML C library for 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	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	11	<h1 align="center">The XML C library for 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	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	20	<p>Libxml is the XML C library developed for the Gnome project. XML itself
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	21	is a metalanguage to design markup languages, i.e. text language where
				22	semantic and structure are added to the content using extra "markup"
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	23	information enclosed between angle brackets. HTML is the most well-known
Daniel Veillard	1eb2424	2002-03-18 11:33:03 +0000	[diff] [blame]	24	markup language. Though the library is written in C <a href="python.html">a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	25	variety of language bindings</a> make it available in other environments.</p>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	26
Daniel Veillard	710823b	2003-03-04 10:05:52 +0000	[diff] [blame]	27	<p>Libxml2 is known to be very portable, the library should build and work
				28	without serious troubles on a variety of systems (Linux, Unix, Windows,
				29	CygWin, MacOS, MacOS X, RISC Os, OS/2, VMS, QNX, MVS, ...)</p>
				30
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	31	<p>Libxml2 implements a number of existing standards related to markup
				32	languages:</p>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	33	<ul>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	34	<li>the XML standard: <a
				35	href="http://www.w3.org/TR/REC-xml">http://www.w3.org/TR/REC-xml</a></li>
				36	<li>Namespaces in XML: <a
				37	href="http://www.w3.org/TR/REC-xml-names/">http://www.w3.org/TR/REC-xml-names/</a></li>
				38	<li>XML Base: <a
				39	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]	40	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc2396.txt">RFC 2396</a> :
				41	Uniform Resource Identifiers <a
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	42	href="http://www.ietf.org/rfc/rfc2396.txt">http://www.ietf.org/rfc/rfc2396.txt</a></li>
				43	<li>XML Path Language (XPath) 1.0: <a
				44	href="http://www.w3.org/TR/xpath">http://www.w3.org/TR/xpath</a></li>
				45	<li>HTML4 parser: <a
				46	href="http://www.w3.org/TR/html401/">http://www.w3.org/TR/html401/</a></li>
				47	<li>most of XML Pointer Language (XPointer) Version 1.0: <a
				48	href="http://www.w3.org/TR/xptr">http://www.w3.org/TR/xptr</a></li>
				49	<li>XML Inclusions (XInclude) Version 1.0: <a
				50	href="http://www.w3.org/TR/xinclude/">http://www.w3.org/TR/xinclude/</a></li>
				51	<li>[ISO-8859-1], <a
				52	href="http://www.cis.ohio-state.edu/rfc/rfc2044.txt">rfc2044</a> [UTF-8]
				53	and <a href="http://www.cis.ohio-state.edu/rfc/rfc2781.txt">rfc2781</a>
				54	[UTF-16] core encodings</li>
				55	<li>part of SGML Open Technical Resolution TR9401:1997</li>
				56	<li>XML Catalogs Working Draft 06 August 2001: <a
				57	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]	58	<li>Canonical XML Version 1.0: <a
				59	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]	60	and the Exclusive XML Canonicalization CR draft <a
				61	href="http://www.w3.org/TR/xml-exc-c14n">http://www.w3.org/TR/xml-exc-c14n</a></li>
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	62	<li>Relax NG Committee Specification 3 December 2001 <a
				63	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]	64	<li>W3C XML Schemas Part 2: Datatypes <a
				65	href="http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/">REC 02 May
				66	2001</a> except the base64Binary and hexBinary types</li>
Daniel Veillard	9698445	2000-08-31 13:50:12 +0000	[diff] [blame]	67	</ul>
				68
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	69	<p>In most cases libxml tries to implement the specifications in a relatively
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	70	strictly compliant way. As of release 2.4.16, libxml2 passes all 1800+ tests
				71	from the <a
Daniel Veillard	a539356	2002-02-20 11:40:49 +0000	[diff] [blame]	72	href="http://www.oasis-open.org/committees/xml-conformance/">OASIS XML Tests
				73	Suite</a>.</p>
Daniel Veillard	5b16f58	2002-02-20 11:38:46 +0000	[diff] [blame]	74
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	75	<p>To some extent libxml2 provides support for the following additional
				76	specifications but doesn't claim to implement them completely:</p>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	77	<ul>
				78	<li>Document Object Model (DOM) <a
				79	href="http://www.w3.org/TR/DOM-Level-2-Core/">http://www.w3.org/TR/DOM-Level-2-Core/</a>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	80	it doesn't implement the API itself, gdome2 does this on top of
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	81	libxml2</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	82	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc959.txt">RFC 959</a> :
				83	libxml implements a basic FTP client code</li>
				84	<li><a href="http://www.cis.ohio-state.edu/rfc/rfc1945.txt">RFC 1945</a> :
				85	HTTP/1.0, again a basic HTTP client code</li>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	86	<li>SAX: a minimal SAX implementation compatible with early expat
				87	versions</li>
				88	<li>DocBook SGML v4: libxml2 includes a hackish parser to transition to
				89	XML</li>
				90	</ul>
				91
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	92	<p>A partial implementation of <a
				93	href="http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/">XML Schemas Part
				94	1: Structure</a> is being worked on but it would be far too early to make any
				95	conformance statement about it at the moment.</p>
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	96
Daniel Veillard	9698445	2000-08-31 13:50:12 +0000	[diff] [blame]	97	<p>Separate documents:</p>
				98	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	99	<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]	100	implementation of XSLT 1.0 and common extensions like EXSLT for
				101	libxml2</li>
Daniel Veillard	c6271d2	2001-10-27 07:50:58 +0000	[diff] [blame]	102	<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]	103	: a standard DOM2 implementation for libxml2</li>
				104	<li><a href="http://www.aleksey.com/xmlsec/">the XMLSec page</a>: an
				105	implementation of <a href="http://www.w3.org/TR/xmldsig-core/">W3C XML
				106	Digital Signature</a> for libxml2</li>
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	107	<li>also check the related links section below for more related and active
				108	projects.</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	109	</ul>
				110
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	111	<p>Results of the <a
				112	href="http://xmlbench.sourceforge.net/results/benchmark/index.html">xmlbench
				113	benchmark</a> on sourceforge 19 March 2003 (smaller is better):</p>
Daniel Veillard	d8da01c	2003-03-24 15:58:23 +0000	[diff] [blame]	114
				115	<p align="center"><img src="benchmark.gif"
				116	alt="benchmark results for Expat Xerces libxml2 Oracle and Sun toolkits"></p>
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	117
Daniel Veillard	e166254	2002-08-28 11:50:59 +0000	[diff] [blame]	118	<p>Logo designed by <a href="mailto:liyanage@access.ch">Marc Liyanage</a>.</p>
				119
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	120	<h2><a name="Introducti">Introduction</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	121
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	122	<p>This document describes libxml, the <a
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	123	href="http://www.w3.org/XML/">XML</a> C library developed for the <a
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	124	href="http://www.gnome.org/">Gnome</a> project. <a
				125	href="http://www.w3.org/XML/">XML is a standard</a> for building tag-based
				126	structured documents/data.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	127
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	128	<p>Here are some key points about libxml:</p>
				129	<ul>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	130	<li>Libxml exports Push (progressive) and Pull (blocking) type parser
				131	interfaces for both XML and HTML.</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	132	<li>Libxml can do DTD validation at parse time, using a parsed document
				133	instance, or with an arbitrary DTD.</li>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	134	<li>Libxml includes complete <a
Daniel Veillard	8c2ecaf	2001-07-10 17:53:07 +0000	[diff] [blame]	135	href="http://www.w3.org/TR/xpath">XPath</a>, <a
				136	href="http://www.w3.org/TR/xptr">XPointer</a> and <a
				137	href="http://www.w3.org/TR/xinclude">XInclude</a> implementations.</li>
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	138	<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]	139	sticking closely to ANSI C/POSIX for easy embedding. Works on
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	140	Linux/Unix/Windows, ported to a number of other platforms.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	141	<li>Basic support for HTTP and FTP client allowing applications to fetch
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	142	remote resources.</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	143	<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]	144	<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]	145	href="http://www.w3.org/DOM/">DOM</a> interfaces.</li>
				146	<li>Libxml also has a <a href="http://www.megginson.com/SAX/index.html">SAX
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	147	like interface</a>; the interface is designed to be compatible with <a
				148	href="http://www.jclark.com/xml/expat.html">Expat</a>.</li>
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	149	<li>This library is released under the <a
				150	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	151	License</a>. See the Copyright file in the distribution for the precise
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	152	wording.</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	153	</ul>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	154
Daniel Veillard	e0c1d72	2001-03-21 10:28:36 +0000	[diff] [blame]	155	<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]	156	Gnome-1.X library requiring it, <strong><span
Daniel Veillard	e0c1d72	2001-03-21 10:28:36 +0000	[diff] [blame]	157	style="background-color: #FF0000">Do Not Use libxml1</span></strong>, use
				158	libxml2</p>
				159
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	160	<h2><a name="FAQ">FAQ</a></h2>
				161
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	162	<p>Table of Contents:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	163	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	164	<li><a href="FAQ.html#License">License(s)</a></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	165	<li><a href="FAQ.html#Installati">Installation</a></li>
				166	<li><a href="FAQ.html#Compilatio">Compilation</a></li>
				167	<li><a href="FAQ.html#Developer">Developer corner</a></li>
				168	</ul>
				169
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	170	<h3><a name="License">License</a>(s)</h3>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	171	<ol>
				172	<li><em>Licensing Terms for libxml</em>
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	173	<p>libxml is released under the <a
				174	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	175	License</a>; see the file Copyright in the distribution for the precise
Daniel Veillard	c575b99	2002-02-08 13:28:40 +0000	[diff] [blame]	176	wording</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	177	</li>
				178	<li><em>Can I embed libxml in a proprietary application ?</em>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	179	<p>Yes. The MIT License allows you to keep proprietary the changes you
				180	made to libxml, but it would be graceful to send-back bug fixes and
				181	improvements as patches for possible incorporation in the main
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	182	development tree.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	183	</li>
				184	</ol>
				185
				186	<h3><a name="Installati">Installation</a></h3>
				187	<ol>
				188	<li>Unless you are forced to because your application links with a Gnome
				189	library requiring it, <strong><span style="background-color: #FF0000">Do
				190	Not Use libxml1</span></strong>, use libxml2</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	191	<li><em>Where can I get libxml</em> ?
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	192	<p>The original distribution comes from <a
				193	href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> or <a
Daniel Veillard	6581e1b	2003-02-09 22:21:43 +0000	[diff] [blame]	194	href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.5/">gnome.org</a></p>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	195	<p>Most Linux and BSD distributions include libxml, this is probably the
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	196	safer way for end-users to use libxml.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	197	<p>David Doolin provides precompiled Windows versions at <a
				198	href="http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/ ">http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/</a></p>
				199	</li>
				200	<li><em>I see libxml and libxml2 releases, which one should I install ?</em>
				201	<ul>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	202	<li>If you are not constrained by backward compatibility issues with
				203	existing applications, install libxml2 only</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	204	<li>If you are not doing development, you can safely install both.
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	205	Usually the packages <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	206	href="http://rpmfind.net/linux/RPM/libxml.html">libxml</a> and <a
				207	href="http://rpmfind.net/linux/RPM/libxml2.html">libxml2</a> are
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	208	compatible (this is not the case for development packages).</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	209	<li>If you are a developer and your system provides separate packaging
				210	for shared libraries and the development components, it is possible
				211	to install libxml and libxml2, and also <a
				212	href="http://rpmfind.net/linux/RPM/libxml-devel.html">libxml-devel</a>
				213	and <a
				214	href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml2-devel</a>
				215	too for libxml2 >= 2.3.0</li>
				216	<li>If you are developing a new application, please develop against
				217	libxml2(-devel)</li>
				218	</ul>
				219	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	220	<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]	221	<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]	222	library for libxml.so.0, you can probably safely remove it. The libxml
				223	packages provided on <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	224	href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> provide
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	225	libxml.so.0</p>
				226	</li>
				227	<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]	228	dependencies</em>
				229	<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]	230	rebuild it locally with</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	231	<p><code>rpm --rebuild libxml(2)-xxx.src.rpm</code>.</p>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	232	<p>If everything goes well it will generate two binary rpm packages (one
				233	providing the shared libs and xmllint, and the other one, the -devel
				234	package, providing includes, static libraries and scripts needed to build
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	235	applications with libxml(2)) that you can install locally.</p>
				236	</li>
				237	</ol>
				238
				239	<h3><a name="Compilatio">Compilation</a></h3>
				240	<ol>
				241	<li><em>What is the process to compile libxml ?</em>
				242	<p>As most UNIX libraries libxml follows the "standard":</p>
				243	<p><code>gunzip -c xxx.tar.gz \| tar xvf -</code></p>
				244	<p><code>cd libxml-xxxx</code></p>
				245	<p><code>./configure --help</code></p>
				246	<p>to see the options, then the compilation/installation proper</p>
				247	<p><code>./configure [possible options]</code></p>
				248	<p><code>make</code></p>
				249	<p><code>make install</code></p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	250	<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]	251	update your list of installed shared libs.</p>
				252	</li>
				253	<li><em>What other libraries are needed to compile/install libxml ?</em>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	254	<p>Libxml does not require any other library, the normal C ANSI API
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	255	should be sufficient (please report any violation to this rule you may
				256	find).</p>
				257	<p>However if found at configuration time libxml will detect and use the
				258	following libs:</p>
				259	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	260	<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]	261	highly portable and available widely compression library.</li>
				262	<li>iconv: a powerful character encoding conversion library. It is
				263	included by default in recent glibc libraries, so it doesn't need to
				264	be installed specifically on Linux. It now seems a <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	265	href="http://www.opennc.org/onlinepubs/7908799/xsh/iconv.html">part
				266	of the official UNIX</a> specification. Here is one <a
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	267	href="http://www.gnu.org/software/libiconv/">implementation of the
				268	library</a> which source can be found <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	269	href="ftp://ftp.ilog.fr/pub/Users/haible/gnu/">here</a>.</li>
				270	</ul>
				271	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	272	<li><em>Make check fails on some platforms</em>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	273	<p>Sometimes the regression tests' results don't completely match the
				274	value produced by the parser, and the makefile uses diff to print the
				275	delta. On some platforms the diff return breaks the compilation process;
				276	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]	277	<p>Sometimes (especially on Solaris) make checks fail due to limitations
Daniel Veillard	e46182c	2002-02-12 14:29:11 +0000	[diff] [blame]	278	in make. Try using GNU-make instead.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	279	</li>
				280	<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]	281	<p>The configure script (and other Makefiles) are generated. Use the
				282	autogen.sh script to regenerate the configure script and Makefiles,
				283	like:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	284	<p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
				285	</li>
				286	<li><em>I have troubles when running make tests with gcc-3.0</em>
				287	<p>It seems the initial release of gcc-3.0 has a problem with the
				288	optimizer which miscompiles the URI module. Please use another
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	289	compiler.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	290	</li>
				291	</ol>
				292
				293	<h3><a name="Developer">Developer</a> corner</h3>
				294	<ol>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	295	<li><em>xmlDocDump() generates output on one line.</em>
				296	<p>Libxml will not <strong>invent</strong> spaces in the content of a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	297	document since <strong>all spaces in the content of a document are
				298	significant</strong>. If you build a tree from the API and want
				299	indentation:</p>
				300	<ol>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	301	<li>the correct way is to generate those yourself too.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	302	<li>the dangerous way is to ask libxml to add those blanks to your
				303	content <strong>modifying the content of your document in the
				304	process</strong>. The result may not be what you expect. There is
				305	<strong>NO</strong> way to guarantee that such a modification won't
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	306	affect other parts of the content of your document. See <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	307	href="http://xmlsoft.org/html/libxml-parser.html#XMLKEEPBLANKSDEFAULT">xmlKeepBlanksDefault
				308	()</a> and <a
				309	href="http://xmlsoft.org/html/libxml-tree.html#XMLSAVEFORMATFILE">xmlSaveFormatFile
				310	()</a></li>
				311	</ol>
				312	</li>
				313	<li>Extra nodes in the document:
				314	<p><em>For a XML file as below:</em></p>
				315	<pre><?xml version="1.0"?>
				316	<PLAN xmlns="http://www.argus.ca/autotest/1.0/">
				317	<NODE CommFlag="0"/>
				318	<NODE CommFlag="1"/>
				319	</PLAN></pre>
				320	<p><em>after parsing it with the function
				321	pxmlDoc=xmlParseFile(...);</em></p>
				322	<p><em>I want to the get the content of the first node (node with the
				323	CommFlag="0")</em></p>
				324	<p><em>so I did it as following;</em></p>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	325	<pre>xmlNodePtr pnode;
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	326	pnode=pxmlDoc->children->children;</pre>
				327	<p><em>but it does not work. If I change it to</em></p>
				328	<pre>pnode=pxmlDoc->children->children->next;</pre>
				329	<p><em>then it works. Can someone explain it to me.</em></p>
				330	<p></p>
				331	<p>In XML all characters in the content of the document are significant
				332	<strong>including blanks and formatting line breaks</strong>.</p>
				333	<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]	334	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]	335	to forget. There is a function <a
				336	href="http://xmlsoft.org/html/libxml-parser.html">xmlKeepBlanksDefault
				337	()</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]	338	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]	339	mixed-content in the document.</p>
				340	</li>
				341	<li><em>I get compilation errors of existing code like when accessing
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	342	<strong>root</strong> or <strong>child fields</strong> of nodes.</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	343	<p>You are compiling code developed for libxml version 1 and using a
				344	libxml2 development environment. Either switch back to libxml v1 devel or
				345	even better fix the code to compile with libxml2 (or both) by <a
				346	href="upgrade.html">following the instructions</a>.</p>
				347	</li>
				348	<li><em>I get compilation errors about non existing
				349	<strong>xmlRootNode</strong> or <strong>xmlChildrenNode</strong>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	350	fields.</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	351	<p>The source code you are using has been <a
				352	href="upgrade.html">upgraded</a> to be able to compile with both libxml
				353	and libxml2, but you need to install a more recent version:
				354	libxml(-devel) >= 1.8.8 or libxml2(-devel) >= 2.1.0</p>
				355	</li>
				356	<li><em>XPath implementation looks seriously broken</em>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	357	<p>XPath implementation prior to 2.3.0 was really incomplete. Upgrade to
				358	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]	359	</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	360	<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]	361	<p>It's hard to maintain the documentation in sync with the code
				362	<grin/> ...</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	363	<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]	364	patches.</p>
				365	</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	366	<li><em>Where can I get more examples and information than privoded on the
				367	web page?</em>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	368	<p>Ideally a libxml book would be nice. I have no such plan ... But you
				369	can:</p>
				370	<ul>
				371	<li>check more deeply the <a href="html/libxml-lib.html">existing
				372	generated doc</a></li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	373	<li>look for examples of use for libxml function using the Gnome code.
				374	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]	375	use of the <strong>xmlAddChild()</strong> function:
				376	<p><a
				377	href="http://cvs.gnome.org/lxr/search?string=xmlAddChild">http://cvs.gnome.org/lxr/search?string=xmlAddChild</a></p>
				378	<p>This may be slow, a large hardware donation to the gnome project
				379	could cure this :-)</p>
				380	</li>
				381	<li><a
				382	href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&dir=gnome-xml">Browse
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	383	the libxml source</a> , I try to write code as clean and documented
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	384	as possible, so looking at it may be helpful. In particular the code
				385	of xmllint.c and of the various testXXX.c test programs should
				386	provide good examples of how to do things with the library.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	387	</ul>
				388	</li>
				389	<li>What about C++ ?
				390	<p>libxml is written in pure C in order to allow easy reuse on a number
				391	of platforms, including embedded systems. I don't intend to convert to
				392	C++.</p>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	393	<p>There are however a few C++ wrappers which may fulfill your needs:</p>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	394	<ul>
				395	<li>by Ari Johnson <ari@btigate.com>:
				396	<p>Website: <a
				397	href="http://lusis.org/~ari/xml++/">http://lusis.org/~ari/xml++/</a></p>
				398	<p>Download: <a
				399	href="http://lusis.org/~ari/xml++/libxml++.tar.gz">http://lusis.org/~ari/xml++/libxml++.tar.gz</a></p>
				400	</li>
				401	<li>by Peter Jones <pjones@pmade.org>
				402	<p>Website: <a
				403	href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
				404	</li>
				405	</ul>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	406	</li>
				407	<li>How to validate a document a posteriori ?
				408	<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]	409	initial parsing time or documents which have been built from scratch
				410	using the API. Use the <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	411	href="http://xmlsoft.org/html/libxml-valid.html#XMLVALIDATEDTD">xmlValidateDtd()</a>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	412	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]	413	document:</p>
				414	<pre>xmlDocPtr doc; /* your existing document */
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	415	xmlDtdPtr dtd = xmlParseDTD(NULL, filename_of_dtd); /* parse the DTD */
				416
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	417	dtd->name = xmlStrDup((xmlChar)"root_name"); / use the given root */
				418
				419	doc->intSubset = dtd;
				420	if (doc->children == NULL) xmlAddChild((xmlNodePtr)doc, (xmlNodePtr)dtd);
				421	else xmlAddPrevSibling(doc->children, (xmlNodePtr)dtd);
				422	</pre>
				423	</li>
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	424	<li>So what is this funky "xmlChar" used all the time?
				425	<p>It is a null terminated sequence of utf-8 characters. And only utf-8!
				426	You need to convert strings encoded in different ways to utf-8 before
				427	passing them to the API. This can be accomplished with the iconv library
				428	for instance.</p>
John Fleck	61f6fb6	2002-10-31 15:23:29 +0000	[diff] [blame]	429	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	430	<li>etc ...</li>
				431	</ol>
				432
				433	<p></p>
				434
Daniel Veillard	1177ca4	2003-04-26 22:29:54 +0000	[diff] [blame^]	435	<h2><a name="Documentat">Developer Documentation</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	436
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	437	<p>There are several on-line resources related to using libxml:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	438	<ol>
Daniel Veillard	321be0c	2002-10-08 21:26:42 +0000	[diff] [blame]	439	<li>Use the <a href="search.php">search engine</a> to lookup
				440	informations.</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	441	<li>Check the <a href="FAQ.html">FAQ.</a></li>
Daniel Veillard	c19fccc	2000-07-03 11:52:01 +0000	[diff] [blame]	442	<li>Check the <a href="http://xmlsoft.org/html/libxml-lib.html">extensive
Daniel Veillard	8c6d6af	2000-08-25 17:14:13 +0000	[diff] [blame]	443	documentation</a> automatically extracted from code comments (using <a
				444	href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&dir=gtk-doc">gtk
				445	doc</a>).</li>
Daniel Veillard	8d86964	2000-07-14 12:12:59 +0000	[diff] [blame]	446	<li>Look at the documentation about <a href="encoding.html">libxml
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	447	internationalization support</a>.</li>
Daniel Veillard	bc66f85	2002-01-14 09:49:20 +0000	[diff] [blame]	448	<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]	449	examples</a> on how to use libxml.</li>
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	450	<li>John Fleck's libxml tutorial: <a href="tutorial/index.html">html</a> or
				451	<a href="tutorial/xmltutorial.pdf">pdf</a>.</li>
Daniel Veillard	1177ca4	2003-04-26 22:29:54 +0000	[diff] [blame^]	452	<li>If you need to parse large files, check the <a
				453	href="xmlreader.html">xmlReader</a> API tutorial</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	454	<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]	455	href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">some nice
				456	documentation</a> explaining how to use the libxml SAX interface.</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	457	<li>George Lebl wrote <a
				458	href="http://www-4.ibm.com/software/developer/library/gnome3/">an article
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	459	for IBM developerWorks</a> about using libxml.</li>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	460	<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]	461	file</a>.</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	462	<li>Read the <a href="upgrade.html">1.x to 2.x upgrade path</a>
				463	description. If you are starting a new project using libxml you should
				464	really use the 2.x version.</li>
Daniel Veillard	845cce4	2002-01-09 11:51:37 +0000	[diff] [blame]	465	<li>And don't forget to look at the <a
				466	href="http://mail.gnome.org/archives/xml/">mailing-list archive</a>.</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	467	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	468
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	469	<h2><a name="Reporting">Reporting bugs and getting help</a></h2>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	470
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	471	<p>Well, bugs or missing features are always possible, and I will make a
				472	point of fixing them in a timely fashion. The best way to report a bug is to
				473	use the <a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">Gnome
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	474	bug tracking database</a> (make sure to use the "libxml2" module name). I
				475	look at reports there regularly and it's good to have a reminder when a bug
				476	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]	477
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	478	<p>There is also a mailing-list <a
Daniel Veillard	3197f16	2001-04-04 00:40:08 +0000	[diff] [blame]	479	href="mailto:xml@gnome.org">xml@gnome.org</a> for libxml, with an <a
				480	href="http://mail.gnome.org/archives/xml/">on-line archive</a> (<a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	481	href="http://xmlsoft.org/messages">old</a>). To subscribe to this list,
				482	please visit the <a
				483	href="http://mail.gnome.org/mailman/listinfo/xml">associated Web</a> page and
				484	follow the instructions. <strong>Do not send code, I won't debug it</strong>
				485	(but patches are really appreciated!).</p>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	486
Daniel Veillard	008186f	2001-09-13 14:24:44 +0000	[diff] [blame]	487	<p>Check the following <strong><span style="color: #FF0000">before
				488	posting</span></strong>:</p>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	489	<ul>
Daniel Veillard	321be0c	2002-10-08 21:26:42 +0000	[diff] [blame]	490	<li>Read the <a href="FAQ.html">FAQ</a> and <a href="search.php">use the
				491	search engine</a> to get informations related to your problem.</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	492	<li>Make sure you are <a href="ftp://xmlsoft.org/">using a recent
				493	version</a>, and that the problem still shows up in a recent version.</li>
				494	<li>Check the <a href="http://mail.gnome.org/archives/xml/">list
				495	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]	496	there is probably a fix available, similarly check the <a
Daniel Veillard	e7ead2d	2001-08-22 23:44:09 +0000	[diff] [blame]	497	href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">registered
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	498	open bugs</a>.</li>
				499	<li>Make sure you can reproduce the bug with xmllint or one of the test
				500	programs found in source in the distribution.</li>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	501	<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]	502	attachment)</li>
Daniel Veillard	234547b	2001-07-05 09:46:10 +0000	[diff] [blame]	503	</ul>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	504
Daniel Veillard	dadd087	2001-09-15 09:21:44 +0000	[diff] [blame]	505	<p>Then send the bug with associated informations to reproduce it to the <a
Daniel Veillard	33a6780	2001-03-07 09:44:02 +0000	[diff] [blame]	506	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]	507	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]	508	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]	509	answer a given question, ask on the list.</p>
				510
				511	<p>To <span style="color: #E50000">be really clear about support</span>:</p>
				512	<ul>
				513	<li>Support or help <span style="color: #E50000">request MUST be sent to
				514	the list or on bugzilla</span> in case of problems, so that the Question
				515	and Answers can be shared publicly. Failing to do so carries the implicit
				516	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]	517	others" and is not welcome. I will automatically Carbon-Copy the
				518	xml@gnome.org mailing list for any technical reply made about libxml2 or
				519	libxslt.</li>
Daniel Veillard	98d071d	2003-01-10 09:22:44 +0000	[diff] [blame]	520	<li>There is <span style="color: #E50000">no garantee for support</span>,
				521	if your question remains unanswered after a week, repost it, making sure
				522	you gave all the detail needed and the informations requested.</li>
				523	<li>Failing to provide informations as requested or double checking first
				524	for prior feedback also carries the implicit message "the time of the
				525	library maintainers is less valuable than my time" and might not be
				526	welcome.</li>
				527	</ul>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	528
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	529	<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]	530	probably be processed faster than those without.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	531
				532	<p>If you're looking for help, a quick look at <a
Daniel Veillard	f7ed336	2001-08-17 12:01:21 +0000	[diff] [blame]	533	href="http://mail.gnome.org/archives/xml/">the list archive</a> may actually
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	534	provide the answer. I usually send source samples when answering libxml usage
Daniel Veillard	6f0adb5	2000-07-03 11:41:26 +0000	[diff] [blame]	535	questions. The <a href="http://xmlsoft.org/html/book1.html">auto-generated
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	536	documentation</a> is not as polished as I would like (i need to learn more
				537	about DocBook), but it's a good starting point.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	538
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	539	<h2><a name="help">How to help</a></h2>
				540
				541	<p>You can help the project in various ways, the best thing to do first is to
				542	subscribe to the mailing-list as explained before, check the <a
Daniel Veillard	f7ed336	2001-08-17 12:01:21 +0000	[diff] [blame]	543	href="http://mail.gnome.org/archives/xml/">archives </a>and the <a
				544	href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">Gnome bug
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	545	database</a>:</p>
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	546	<ol>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	547	<li>Provide patches when you find problems.</li>
				548	<li>Provide the diffs when you port libxml to a new platform. They may not
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	549	be integrated in all cases but help pinpointing portability problems
				550	and</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	551	<li>Provide documentation fixes (either as patches to the code comments or
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	552	as HTML diffs).</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	553	<li>Provide new documentations pieces (translations, examples, etc
				554	...).</li>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	555	<li>Check the TODO file and try to close one of the items.</li>
				556	<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]	557	provide a fix. <a href="mailto:daniel@veillard.com">Get in touch with me
				558	</a>before to avoid synchronization problems and check that the suggested
				559	fix will fit in nicely :-)</li>
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	560	</ol>
				561
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	562	<h2><a name="Downloads">Downloads</a></h2>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	563
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	564	<p>The latest versions of libxml can be found on <a
Daniel Veillard	20c8cf2	2001-06-26 22:47:36 +0000	[diff] [blame]	565	href="ftp://xmlsoft.org/">xmlsoft.org</a> (<a
				566	href="ftp://speakeasy.rpmfind.net/pub/libxml/">Seattle</a>, <a
				567	href="ftp://fr.rpmfind.net/pub/libxml/">France</a>) or on the <a
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	568	href="ftp://ftp.gnome.org/pub/GNOME/MIRRORS.html">Gnome FTP server</a> either
Daniel Veillard	6581e1b	2003-02-09 22:21:43 +0000	[diff] [blame]	569	as a <a href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.5/">source
MDT 2002 John Fleck	30c7054	2002-09-24 14:24:54 +0000	[diff] [blame]	570	archive</a><!-- commenting this out because they seem to have disappeared or <a
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	571	href="ftp://ftp.gnome.org/pub/GNOME/stable/redhat/i386/libxml/">RPM
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	572	packages</a> -->
Daniel Veillard	321be0c	2002-10-08 21:26:42 +0000	[diff] [blame]	573	, 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]	574	mirror in Austria</a>. (NOTE that you need both the <a
Daniel Veillard	c19fccc	2000-07-03 11:52:01 +0000	[diff] [blame]	575	href="http://rpmfind.net/linux/RPM/libxml2.html">libxml(2)</a> and <a
				576	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]	577	packages installed to compile applications using libxml.)</p>
				578
				579	<p>Binary ports:</p>
				580	<ul>
				581	<li>Red Hat RPMs for i386 are available directly on <a
				582	href="ftp://xmlsoft.org/">xmlsoft.org</a>, the source RPM will compile on
				583	any architecture supported by Red Hat.</li>
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	584	<li><p><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a></p>
Daniel Veillard	ce192eb	2003-04-16 15:58:05 +0000	[diff] [blame]	585	is now the maintainer of the Windows port, <a
Daniel Veillard	b46a573	2003-04-08 13:35:48 +0000	[diff] [blame]	586	href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
				587	binaries</a>.</li>
				588	<li><a href="mailto:Gary.Pennington@sun.com">Gary Pennington</a> provides
				589	<a href="http://garypennington.net/libxml2/">Solaris binaries</a>.</li>
				590	<li><a href="mailto:Steve.Ball@zveno.com">Steve Ball</a> provides <a
				591	href="http://www.zveno.com/open_source/libxml2xslt.html">Mac Os X
				592	binaries</a>.</li>
				593	<li>The HP-UX porting center provides <a
				594	href="http://hpux.connect.org.uk/hppd/hpux/Gnome/">HP-UX binaries</a></li>
				595	</ul>
				596
				597	<p>If you know other supported binary ports, please <a
				598	href="http://veillard.com/">contact me</a>.</p>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	599
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	600	<p><a name="Snapshot">Snapshot:</a></p>
				601	<ul>
				602	<li>Code from the W3C cvs base libxml <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	603	href="ftp://xmlsoft.org/cvs-snapshot.tar.gz">cvs-snapshot.tar.gz</a>.</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	604	<li>Docs, content of the web site, the list archive included <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	605	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]	606	</ul>
				607
Daniel Veillard	c6271d2	2001-10-27 07:50:58 +0000	[diff] [blame]	608	<p><a name="Contribs">Contributions:</a></p>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	609
				610	<p>I do accept external contributions, especially if compiling on another
Daniel Veillard	c6271d2	2001-10-27 07:50:58 +0000	[diff] [blame]	611	platform, get in touch with me to upload the package, wrappers for various
Daniel Veillard	5109531	2001-10-28 18:51:57 +0000	[diff] [blame]	612	languages have been provided, and can be found in the <a
				613	href="contribs.html">contrib section</a></p>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	614
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	615	<p>Libxml is also available from CVS:</p>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	616	<ul>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	617	<li><p>The <a
				618	href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&dir=gnome-xml">Gnome
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	619	CVS base</a>. Check the <a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	620	href="http://developer.gnome.org/tools/cvs.html">Gnome CVS Tools</a>
				621	page; the CVS module is <b>gnome-xml</b>.</p>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	622	</li>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	623	<li>The <strong>libxslt</strong> module is also present there</li>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	624	</ul>
				625
				626	<h2><a name="News">News</a></h2>
				627
Daniel Veillard	944b5ff	1999-12-15 19:08:24 +0000	[diff] [blame]	628	<h3>CVS only : check the <a
				629	href="http://cvs.gnome.org/lxr/source/gnome-xml/ChangeLog">Changelog</a> file
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	630	for a really accurate description</h3>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	631
Daniel Veillard	e6d8e20	2002-05-02 06:11:10 +0000	[diff] [blame]	632	<p>Items not finished and worked on, get in touch with the list if you want
				633	to test those</p>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	634	<ul>
Daniel Veillard	72fef16	2003-02-05 14:31:19 +0000	[diff] [blame]	635	<li>More testing on RelaxNG</li>
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	636	<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]	637	Schemas</a></li>
				638	</ul>
				639
Daniel Veillard	92fc02c	2003-04-24 23:12:35 +0000	[diff] [blame]	640	<h3>2.5.7: Apr 25 2003</h3>
				641	<ul>
				642	<li>Relax-NG: Compiling to regexp and streaming validation on top of the
				643	xmlReader interface, added to xmllint --stream</li>
				644	<li>xmlReader: Expand(), Next() and DOM access glue, bug fixes</li>
				645	<li>Support for large files: RGN validated a 4.5GB instance</li>
				646	<li>Thread support is now configured in by default</li>
				647	<li>Fixes: update of the Trio code (Bjorn), WXS Date and Duration fixes
				648	(Charles Bozeman), DTD and namespaces (Brent Hendricks), HTML push parser
				649	and zero bytes handling, some missing Windows file path conversions,
				650	behaviour of the parser and validator in the presence of "out of memory"
				651	error conditions </li>
				652	<li>extended the API to be able to plug a garbage collecting memory
				653	allocator, added xmlMallocAtomic() and modified the allocations
				654	accordingly.</li>
				655	<li>Performances: removed excessive malloc() calls, speedup of the push and
				656	xmlReader interfaces, removed excessive thread locking</li>
				657	<li>Documentation: man page (John Fleck), xmlReader documentation</li>
				658	<li>Python: adding binding for xmlCatalogAddLocal (Brent M Hendricks)</li>
				659	</ul>
				660
Daniel Veillard	c2d4a93	2003-04-01 11:13:05 +0000	[diff] [blame]	661	<h3>2.5.6: Apr 1 2003</h3>
				662	<ul>
				663	<li>Fixed W3C XML Schemas datatype, should be compliant now except for
				664	binHex and base64 which are not supported yet.</li>
				665	<li>bug fixes: non-ASCII IDs, HTML output, XInclude on large docs and
				666	XInclude entities handling, encoding detection on external subsets, XML
				667	Schemas bugs and memory leaks, HTML parser (James Bursa)</li>
				668	<li>portability: python/trio (Albert Chin), Sun compiler warnings</li>
				669	<li>documentation: added --relaxng option to xmllint man page (John)</li>
				670	<li>improved error reporting: xml:space, start/end tag mismatches, Relax NG
				671	errors</li>
				672	</ul>
				673
				674	<h3>2.5.5: Mar 24 2003</h3>
Daniel Veillard	d8da01c	2003-03-24 15:58:23 +0000	[diff] [blame]	675	<ul>
				676	<li>Lot of fixes on the Relax NG implementation. More testing including
				677	DocBook and TEI examples.</li>
				678	<li>Increased the support for W3C XML Schemas datatype</li>
				679	<li>Several bug fixes in the URI handling layer</li>
				680	<li>Bug fixes: HTML parser, xmlReader, DTD validation, XPath, encoding
				681	conversion, line counting in the parser.</li>
				682	<li>Added support for $XMLLINT_INDENT environment variable, FTP delete</li>
				683	<li>Fixed the RPM spec file name</li>
				684	</ul>
				685
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	686	<h3>2.5.4: Feb 20 2003</h3>
				687	<ul>
				688	<li>Conformance testing and lot of fixes on Relax NG and XInclude
				689	implementation</li>
				690	<li>Implementation of XPointer element() scheme</li>
				691	<li>Bug fixes: XML parser, XInclude entities merge, validity checking on
				692	namespaces,
				693	<p>2 serialization bugs, node info generation problems, a DTD regexp
				694	generation problem.</p>
				695	</li>
				696	<li>Portability: windows updates and path canonicalization (Igor)</li>
				697	<li>A few typo fixes (Kjartan Maraas)</li>
				698	<li>Python bindings generator fixes (Stephane Bidoul)</li>
				699	</ul>
				700
Daniel Veillard	1d788d2	2003-02-10 16:21:58 +0000	[diff] [blame]	701	<h3>2.5.3: Feb 10 2003</h3>
				702	<ul>
				703	<li>RelaxNG and XML Schemas datatypes improvements, and added a first
				704	version of RelaxNG Python bindings</li>
				705	<li>Fixes: XLink (Sean Chittenden), XInclude (Sean Chittenden), API fix for
				706	serializing namespace nodes, encoding conversion bug, XHTML1
				707	serialization</li>
				708	<li>Portability fixes: Windows (Igor), AMD 64bits RPM spec file</li>
				709	</ul>
				710
Daniel Veillard	72fef16	2003-02-05 14:31:19 +0000	[diff] [blame]	711	<h3>2.5.2: Feb 5 2003</h3>
				712	<ul>
				713	<li>First implementation of RelaxNG, added --relaxng flag to xmllint</li>
				714	<li>Schemas support now compiled in by default.</li>
				715	<li>Bug fixes: DTD validation, namespace checking, XInclude and entities,
				716	delegateURI in XML Catalogs, HTML parser, XML reader (Stéphane Bidoul),
				717	XPath parser and evaluation, UTF8ToUTF8 serialization, XML reader memory
				718	consumption, HTML parser, HTML serialization in the presence of
				719	namespaces</li>
				720	<li>added an HTML API to check elements and attributes.</li>
				721	<li>Documentation improvement, PDF for the tutorial (John Fleck), doc
				722	patches (Stefan Kost)</li>
				723	<li>Portability fixes: NetBSD (Julio Merino), Windows (Igor Zlatkovic)</li>
				724	<li>Added python bindings for XPointer, contextual error reporting
				725	(Stéphane Bidoul)</li>
				726	<li>URI/file escaping problems (Stefano Zacchiroli)</li>
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	727	</ul>
				728
Daniel Veillard	e2830f1	2003-01-08 17:47:49 +0000	[diff] [blame]	729	<h3>2.5.1: Jan 8 2003</h3>
				730	<ul>
				731	<li>Fixes a memory leak and configuration/compilation problems in 2.5.0</li>
				732	<li>documentation updates (John)</li>
				733	<li>a couple of XmlTextReader fixes</li>
				734	</ul>
				735
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	736	<h3>2.5.0: Jan 6 2003</h3>
				737	<ul>
				738	<li>New <a href="xmlreader.html">XmltextReader interface</a> based on C#
				739	API (with help of Stéphane Bidoul)</li>
				740	<li>Windows: more exports, including the new API (Igor)</li>
				741	<li>XInclude fallback fix</li>
				742	<li>Python: bindings for the new API, packaging (Stéphane Bidoul),
				743	drv_libxml2.py Python xml.sax driver (Stéphane Bidoul), fixes, speedup
				744	and iterators for Python-2.2 (Hannu Krosing)</li>
				745	<li>Tutorial fixes (john Fleck and Niraj Tolia) xmllint man update
				746	(John)</li>
				747	<li>Fix an XML parser bug raised by Vyacheslav Pindyura</li>
				748	<li>Fix for VMS serialization (Nigel Hall) and config (Craig A. Berry)</li>
				749	<li>Entities handling fixes</li>
				750	<li>new API to optionally track node creation and deletion (Lukas
				751	Schroeder)</li>
				752	<li>Added documentation for the XmltextReader interface and some <a
				753	href="guidelines.html">XML guidelines</a></li>
				754	</ul>
				755
Daniel Veillard	c1eed32	2002-12-12 11:01:32 +0000	[diff] [blame]	756	<h3>2.4.30: Dec 12 2002</h3>
				757	<ul>
				758	<li>2.4.29 broke the python bindings, rereleasing</li>
				759	<li>Improvement/fixes of the XML API generator, and couple of minor code
				760	fixes.</li>
				761	</ul>
				762
Daniel Veillard	9b4bb4d	2002-12-11 19:28:47 +0000	[diff] [blame]	763	<h3>2.4.29: Dec 11 2002</h3>
				764	<ul>
				765	<li>Windows fixes (Igor): Windows CE port, pthread linking, python bindings
				766	(Stéphane Bidoul), Mingw (Magnus Henoch), and export list updates</li>
				767	<li>Fix for prev in python bindings (ERDI Gergo)</li>
				768	<li>Fix for entities handling (Marcus Clarke)</li>
				769	<li>Refactored the XML and HTML dumps to a single code path, fixed XHTML1
				770	dump</li>
				771	<li>Fix for URI parsing when handling URNs with fragment identifiers</li>
				772	<li>Fix for HTTP URL escaping problem</li>
				773	<li>added an TextXmlReader (C#) like API (work in progress)</li>
				774	<li>Rewrote the API in XML generation script, includes a C parser and saves
				775	more informations needed for C# bindings</li>
				776	</ul>
				777
Daniel Veillard	f9c4cad	2002-11-22 15:57:07 +0000	[diff] [blame]	778	<h3>2.4.28: Nov 22 2002</h3>
				779	<ul>
				780	<li>a couple of python binding fixes</li>
				781	<li>2 bug fixes in the XML push parser</li>
				782	<li>potential memory leak removed (Martin Stoilov)</li>
				783	<li>fix to the configure script for Unix (Dimitri Papadopoulos)</li>
				784	<li>added encoding support for XInclude parse="text"</li>
				785	<li>autodetection of XHTML1 and specific serialization rules added</li>
Daniel Veillard	9b4bb4d	2002-12-11 19:28:47 +0000	[diff] [blame]	786	<li>nasty threading bug fixed (William Brack)</li>
Daniel Veillard	f9c4cad	2002-11-22 15:57:07 +0000	[diff] [blame]	787	</ul>
				788
Daniel Veillard	dad3f68	2002-11-17 16:47:27 +0000	[diff] [blame]	789	<h3>2.4.27: Nov 17 2002</h3>
				790	<ul>
				791	<li>fixes for the Python bindings</li>
				792	<li>a number of bug fixes: SGML catalogs, xmlParseBalancedChunkMemory(),
				793	HTML parser, Schemas (Charles Bozeman), document fragment support
				794	(Christian Glahn), xmlReconciliateNs (Brian Stafford), XPointer,
				795	xmlFreeNode(), xmlSAXParseMemory (Peter Jones), xmlGetNodePath (Petr
				796	Pajas), entities processing</li>
				797	<li>added grep to xmllint --shell</li>
				798	<li>VMS update patch from Craig A. Berry</li>
				799	<li>cleanup of the Windows build with support for more compilers (Igor),
				800	better thread support on Windows</li>
				801	<li>cleanup of Unix Makefiles and spec file</li>
				802	<li>Improvements to the documentation (John Fleck)</li>
				803	</ul>
				804
Daniel Veillard	4826743	2002-10-18 11:21:38 +0000	[diff] [blame]	805	<h3>2.4.26: Oct 18 2002</h3>
				806	<ul>
				807	<li>Patches for Windows CE port, improvements on Windows paths handling</li>
				808	<li>Fixes to the validation code (DTD and Schemas), xmlNodeGetPath() ,
				809	HTML serialization, Namespace compliance, and a number of small
				810	problems</li>
				811	</ul>
				812
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	813	<h3>2.4.25: Sep 26 2002</h3>
				814	<ul>
				815	<li>A number of bug fixes: XPath, validation, Python bindings, DOM and
				816	tree, xmlI/O, Html</li>
				817	<li>Serious rewrite of XInclude</li>
				818	<li>Made XML Schemas regexp part of the default build and APIs, small fix
				819	and improvement of the regexp core</li>
				820	<li>Changed the validation code to reuse XML Schemas regexp APIs</li>
				821	<li>Better handling of Windows file paths, improvement of Makefiles (Igor,
				822	Daniel Gehriger, Mark Vakoc)</li>
				823	<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]	824	APIs</li>
Daniel Veillard	e16b574	2002-09-26 17:50:03 +0000	[diff] [blame]	825	<li>New logos from Marc Liyanage</li>
				826	<li>Tutorial improvements: John Fleck, Christopher Harris</li>
				827	<li>Makefile: Fixes for AMD x86_64 (Mandrake), DESTDIR (Christophe
				828	Merlet)</li>
				829	<li>removal of all stderr/perror use for error reporting</li>
				830	<li>Better error reporting: XPath and DTD validation</li>
				831	<li>update of the trio portability layer (Bjorn Reese)</li>
				832	</ul>
				833
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	834	<p><strong>2.4.24: Aug 22 2002</strong></p>
				835	<ul>
				836	<li>XPath fixes (William), xf:escape-uri() (Wesley Terpstra)</li>
				837	<li>Python binding fixes: makefiles (William), generator, rpm build, x86-64
				838	(fcrozat)</li>
				839	<li>HTML <style> and boolean attributes serializer fixes</li>
				840	<li>C14N improvements by Aleksey</li>
Daniel Veillard	e166254	2002-08-28 11:50:59 +0000	[diff] [blame]	841	<li>doc cleanups: Rick Jones</li>
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	842	<li>Windows compiler makefile updates: Igor and Elizabeth Barham</li>
				843	<li>XInclude: implementation of fallback and xml:base fixup added</li>
				844	</ul>
				845
Daniel Veillard	782afda	2002-07-08 15:12:49 +0000	[diff] [blame]	846	<h3>2.4.23: July 6 2002</h3>
				847	<ul>
				848	<li>performances patches: Peter Jacobi</li>
				849	<li>c14n fixes, testsuite and performances: Aleksey Sanin</li>
				850	<li>added xmlDocFormatDump: Chema Celorio</li>
				851	<li>new tutorial: John Fleck</li>
				852	<li>new hash functions and performances: Sander Vesik, portability fix from
				853	Peter Jacobi</li>
				854	<li>a number of bug fixes: XPath (William Brack, Richard Jinks), XML and
				855	HTML parsers, ID lookup function</li>
				856	<li>removal of all remaining sprintf: Aleksey Sanin</li>
				857	</ul>
				858
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	859	<h3>2.4.22: May 27 2002</h3>
				860	<ul>
				861	<li>a number of bug fixes: configure scripts, base handling, parser, memory
				862	usage, HTML parser, XPath, documentation (Christian Cornelssen),
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	863	indentation, URI parsing</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	864	<li>Optimizations for XMLSec, fixing and making public some of the network
				865	protocol handlers (Aleksey)</li>
				866	<li>performance patch from Gary Pennington</li>
				867	<li>Charles Bozeman provided date and time support for XML Schemas
				868	datatypes</li>
				869	</ul>
				870
Daniel Veillard	cf27f7c	2002-04-30 07:12:39 +0000	[diff] [blame]	871	<h3>2.4.21: Apr 29 2002</h3>
				872
				873	<p>This release is both a bug fix release and also contains the early XML
				874	Schemas <a href="http://www.w3.org/TR/xmlschema-1/">structures</a> and <a
				875	href="http://www.w3.org/TR/xmlschema-2/">datatypes</a> code, beware, all
				876	interfaces are likely to change, there is huge holes, it is clearly a work in
				877	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]	878	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]	879	<ul>
				880	<li>a couple of bugs or limitations introduced in 2.4.20</li>
				881	<li>patches for Borland C++ and MSC by Igor</li>
				882	<li>some fixes on XPath strings and conformance patches by Richard
				883	Jinks</li>
				884	<li>patch from Aleksey for the ExcC14N specification</li>
				885	<li>OSF/1 bug fix by Bjorn</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	886	</ul>
				887
Daniel Veillard	a7084cd	2002-04-15 17:12:47 +0000	[diff] [blame]	888	<h3>2.4.20: Apr 15 2002</h3>
				889	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	890	<li>bug fixes: file descriptor leak, XPath, HTML output, DTD validation</li>
Daniel Veillard	a7084cd	2002-04-15 17:12:47 +0000	[diff] [blame]	891	<li>XPath conformance testing by Richard Jinks</li>
				892	<li>Portability fixes: Solaris, MPE/iX, Windows, OSF/1, python bindings,
				893	libxml.m4</li>
				894	</ul>
				895
Daniel Veillard	1927409	2002-03-25 16:48:03 +0000	[diff] [blame]	896	<h3>2.4.19: Mar 25 2002</h3>
				897	<ul>
				898	<li>bug fixes: half a dozen XPath bugs, Validation, ISO-Latin to UTF8
				899	encoder</li>
				900	<li>portability fixes in the HTTP code</li>
Daniel Veillard	b2fb8ed	2002-04-01 09:33:12 +0000	[diff] [blame]	901	<li>memory allocation checks using valgrind, and profiling tests</li>
Daniel Veillard	1927409	2002-03-25 16:48:03 +0000	[diff] [blame]	902	<li>revamp of the Windows build and Makefiles</li>
				903	</ul>
				904
Daniel Veillard	34ce8be	2002-03-18 19:37:11 +0000	[diff] [blame]	905	<h3>2.4.18: Mar 18 2002</h3>
				906	<ul>
				907	<li>bug fixes: tree, SAX, canonicalization, validation, portability,
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	908	XPath</li>
Daniel Veillard	34ce8be	2002-03-18 19:37:11 +0000	[diff] [blame]	909	<li>removed the --with-buffer option it was becoming unmaintainable</li>
				910	<li>serious cleanup of the Python makefiles</li>
				911	<li>speedup patch to XPath very effective for DocBook stylesheets</li>
				912	<li>Fixes for Windows build, cleanup of the documentation</li>
				913	</ul>
				914
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	915	<h3>2.4.17: Mar 8 2002</h3>
				916	<ul>
				917	<li>a lot of bug fixes, including "namespace nodes have no parents in
				918	XPath"</li>
				919	<li>fixed/improved the Python wrappers, added more examples and more
				920	regression tests, XPath extension functions can now return node-sets</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	921	<li>added the XML Canonicalization support from Aleksey Sanin</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	922	</ul>
				923
Daniel Veillard	5f4b599	2002-02-20 10:22:49 +0000	[diff] [blame]	924	<h3>2.4.16: Feb 20 2002</h3>
				925	<ul>
				926	<li>a lot of bug fixes, most of them were triggered by the XML Testsuite
				927	from OASIS and W3C. Compliance has been significantly improved.</li>
				928	<li>a couple of portability fixes too.</li>
				929	</ul>
				930
Daniel Veillard	397ff11	2002-02-11 18:27:20 +0000	[diff] [blame]	931	<h3>2.4.15: Feb 11 2002</h3>
				932	<ul>
				933	<li>Fixed the Makefiles, especially the python module ones</li>
				934	<li>A few bug fixes and cleanup</li>
				935	<li>Includes cleanup</li>
				936	</ul>
				937
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	938	<h3>2.4.14: Feb 8 2002</h3>
				939	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	940	<li>Change of License to the <a
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	941	href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	942	License</a> basically for integration in XFree86 codebase, and removing
				943	confusion around the previous dual-licensing</li>
Daniel Veillard	b6c1e2f	2002-02-08 14:52:52 +0000	[diff] [blame]	944	<li>added Python bindings, beta software but should already be quite
				945	complete</li>
				946	<li>a large number of fixes and cleanups, especially for all tree
				947	manipulations</li>
				948	<li>cleanup of the headers, generation of a reference API definition in
				949	XML</li>
				950	</ul>
				951
				952	<h3>2.4.13: Jan 14 2002</h3>
Daniel Veillard	744683d	2002-01-14 17:30:20 +0000	[diff] [blame]	953	<ul>
				954	<li>update of the documentation: John Fleck and Charlie Bozeman</li>
				955	<li>cleanup of timing code from Justin Fletcher</li>
				956	<li>fixes for Windows and initial thread support on Win32: Igor and Serguei
				957	Narojnyi</li>
				958	<li>Cygwin patch from Robert Collins</li>
				959	<li>added xmlSetEntityReferenceFunc() for Keith Isdale work on xsldbg</li>
				960	</ul>
				961
Daniel Veillard	ef90ba7	2001-12-07 14:24:22 +0000	[diff] [blame]	962	<h3>2.4.12: Dec 7 2001</h3>
				963	<ul>
				964	<li>a few bug fixes: thread (Gary Pennington), xmllint (Geert Kloosterman),
				965	XML parser (Robin Berjon), XPointer (Danny Jamshy), I/O cleanups
				966	(robert)</li>
				967	<li>Eric Lavigne contributed project files for MacOS</li>
				968	<li>some makefiles cleanups</li>
				969	</ul>
				970
Daniel Veillard	a487105	2001-11-26 13:19:48 +0000	[diff] [blame]	971	<h3>2.4.11: Nov 26 2001</h3>
				972	<ul>
				973	<li>fixed a couple of errors in the includes, fixed a few bugs, some code
				974	cleanups</li>
				975	<li>xmllint man pages improvement by Heiko Rupp</li>
				976	<li>updated VMS build instructions from John A Fotheringham</li>
				977	<li>Windows Makefiles updates from Igor</li>
				978	</ul>
				979
Daniel Veillard	43d3f61	2001-11-10 11:57:23 +0000	[diff] [blame]	980	<h3>2.4.10: Nov 10 2001</h3>
				981	<ul>
				982	<li>URI escaping fix (Joel Young)</li>
				983	<li>added xmlGetNodePath() (for paths or XPointers generation)</li>
				984	<li>Fixes namespace handling problems when using DTD and validation</li>
				985	<li>improvements on xmllint: Morus Walter patches for --format and
				986	--encode, Stefan Kost and Heiko Rupp improvements on the --shell</li>
				987	<li>fixes for xmlcatalog linking pointed by Weiqi Gao</li>
				988	<li>fixes to the HTML parser</li>
				989	</ul>
				990
				991	<h3>2.4.9: Nov 6 2001</h3>
				992	<ul>
				993	<li>fixes more catalog bugs</li>
				994	<li>avoid a compilation problem, improve xmlGetLineNo()</li>
				995	</ul>
				996
Daniel Veillard	ed421aa	2001-11-04 21:22:45 +0000	[diff] [blame]	997	<h3>2.4.8: Nov 4 2001</h3>
				998	<ul>
				999	<li>fixed SGML catalogs broken in previous release, updated xmlcatalog
				1000	tool</li>
				1001	<li>fixed a compile errors and some includes troubles.</li>
				1002	</ul>
				1003
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	1004	<h3>2.4.7: Oct 30 2001</h3>
				1005	<ul>
				1006	<li>exported some debugging interfaces</li>
				1007	<li>serious rewrite of the catalog code</li>
				1008	<li>integrated Gary Pennington thread safety patch, added configure option
				1009	and regression tests</li>
				1010	<li>removed an HTML parser bug</li>
				1011	<li>fixed a couple of potentially serious validation bugs</li>
				1012	<li>integrated the SGML DocBook support in xmllint</li>
				1013	<li>changed the nanoftp anonymous login passwd</li>
				1014	<li>some I/O cleanup and a couple of interfaces for Perl wrapper</li>
				1015	<li>general bug fixes</li>
				1016	<li>updated xmllint man page by John Fleck</li>
				1017	<li>some VMS and Windows updates</li>
				1018	</ul>
				1019
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1020	<h3>2.4.6: Oct 10 2001</h3>
				1021	<ul>
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	1022	<li>added an updated man pages by John Fleck</li>
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1023	<li>portability and configure fixes</li>
				1024	<li>an infinite loop on the HTML parser was removed (William)</li>
				1025	<li>Windows makefile patches from Igor</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1026	<li>fixed half a dozen bugs reported for libxml or libxslt</li>
Daniel Veillard	60087f3	2001-10-10 09:45:09 +0000	[diff] [blame]	1027	<li>updated xmlcatalog to be able to modify SGML super catalogs</li>
				1028	</ul>
				1029
Daniel Veillard	dadd087	2001-09-15 09:21:44 +0000	[diff] [blame]	1030	<h3>2.4.5: Sep 14 2001</h3>
				1031	<ul>
				1032	<li>Remove a few annoying bugs in 2.4.4</li>
				1033	<li>forces the HTML serializer to output decimal charrefs since some
				1034	version of Netscape can't handle hexadecimal ones</li>
				1035	</ul>
				1036
				1037	<h3>1.8.16: Sep 14 2001</h3>
				1038	<ul>
				1039	<li>maintenance release of the old libxml1 branch, couple of bug and
				1040	portability fixes</li>
				1041	</ul>
				1042
Daniel Veillard	04382ae	2001-09-12 18:51:30 +0000	[diff] [blame]	1043	<h3>2.4.4: Sep 12 2001</h3>
				1044	<ul>
				1045	<li>added --convert to xmlcatalog, bug fixes and cleanups of XML
				1046	Catalog</li>
				1047	<li>a few bug fixes and some portability changes</li>
				1048	<li>some documentation cleanups</li>
				1049	</ul>
				1050
Daniel Veillard	3993690	2001-08-24 00:49:01 +0000	[diff] [blame]	1051	<h3>2.4.3: Aug 23 2001</h3>
				1052	<ul>
				1053	<li>XML Catalog support see the doc</li>
				1054	<li>New NaN/Infinity floating point code</li>
				1055	<li>A few bug fixes</li>
				1056	</ul>
				1057
				1058	<h3>2.4.2: Aug 15 2001</h3>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1059	<ul>
				1060	<li>adds xmlLineNumbersDefault() to control line number generation</li>
				1061	<li>lot of bug fixes</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1062	<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]	1063	<li>inheritance of namespaces from DTD defaulted attributes</li>
				1064	<li>fixes a serious potential security bug</li>
				1065	<li>added a --format option to xmllint</li>
				1066	</ul>
				1067
				1068	<h3>2.4.1: July 24 2001</h3>
				1069	<ul>
				1070	<li>possibility to keep line numbers in the tree</li>
				1071	<li>some computation NaN fixes</li>
				1072	<li>extension of the XPath API</li>
				1073	<li>cleanup for alpha and ia64 targets</li>
				1074	<li>patch to allow saving through HTTP PUT or POST</li>
Daniel Veillard	09ab7e1	2001-07-10 15:49:44 +0000	[diff] [blame]	1075	</ul>
				1076
				1077	<h3>2.4.0: July 10 2001</h3>
				1078	<ul>
				1079	<li>Fixed a few bugs in XPath, validation, and tree handling.</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1080	<li>Fixed XML Base implementation, added a couple of examples to the
Daniel Veillard	09ab7e1	2001-07-10 15:49:44 +0000	[diff] [blame]	1081	regression tests</li>
				1082	<li>A bit of cleanup</li>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	1083	</ul>
				1084
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1085	<h3>2.3.14: July 5 2001</h3>
				1086	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1087	<li>fixed some entities problems and reduce memory requirement when
				1088	substituting them</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1089	<li>lots of improvements in the XPath queries interpreter can be
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1090	substantially faster</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1091	<li>Makefiles and configure cleanups</li>
				1092	<li>Fixes to XPath variable eval, and compare on empty node set</li>
				1093	<li>HTML tag closing bug fixed</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1094	<li>Fixed an URI reference computation problem when validating</li>
Daniel Veillard	5b43fde	2001-07-05 23:31:40 +0000	[diff] [blame]	1095	</ul>
				1096
Daniel Veillard	2adbb51	2001-06-28 16:20:36 +0000	[diff] [blame]	1097	<h3>2.3.13: June 28 2001</h3>
				1098	<ul>
				1099	<li>2.3.12 configure.in was broken as well as the push mode XML parser</li>
				1100	<li>a few more fixes for compilation on Windows MSC by Yon Derek</li>
				1101	</ul>
				1102
				1103	<h3>1.8.14: June 28 2001</h3>
				1104	<ul>
				1105	<li>Zbigniew Chyla gave a patch to use the old XML parser in push mode</li>
				1106	<li>Small Makefile fix</li>
				1107	</ul>
				1108
Daniel Veillard	1164810	2001-06-26 16:08:24 +0000	[diff] [blame]	1109	<h3>2.3.12: June 26 2001</h3>
				1110	<ul>
				1111	<li>lots of cleanup</li>
				1112	<li>a couple of validation fix</li>
				1113	<li>fixed line number counting</li>
				1114	<li>fixed serious problems in the XInclude processing</li>
				1115	<li>added support for UTF8 BOM at beginning of entities</li>
				1116	<li>fixed a strange gcc optimizer bugs in xpath handling of float, gcc-3.0
				1117	miscompile uri.c (William), Thomas Leitner provided a fix for the
				1118	optimizer on Tru64</li>
				1119	<li>incorporated Yon Derek and Igor Zlatkovic fixes and improvements for
				1120	compilation on Windows MSC</li>
				1121	<li>update of libxml-doc.el (Felix Natter)</li>
				1122	<li>fixed 2 bugs in URI normalization code</li>
				1123	</ul>
				1124
Daniel Veillard	e3c81b5	2001-06-17 14:50:34 +0000	[diff] [blame]	1125	<h3>2.3.11: June 17 2001</h3>
				1126	<ul>
				1127	<li>updates to trio, Makefiles and configure should fix some portability
				1128	problems (alpha)</li>
				1129	<li>fixed some HTML serialization problems (pre, script, and block/inline
				1130	handling), added encoding aware APIs, cleanup of this code</li>
				1131	<li>added xmlHasNsProp()</li>
				1132	<li>implemented a specific PI for encoding support in the DocBook SGML
				1133	parser</li>
				1134	<li>some XPath fixes (-Infinity, / as a function parameter and namespaces
				1135	node selection)</li>
				1136	<li>fixed a performance problem and an error in the validation code</li>
				1137	<li>fixed XInclude routine to implement the recursive behaviour</li>
				1138	<li>fixed xmlFreeNode problem when libxml is included statically twice</li>
				1139	<li>added --version to xmllint for bug reports</li>
				1140	</ul>
				1141
Daniel Veillard	2e4f188	2001-06-01 10:11:57 +0000	[diff] [blame]	1142	<h3>2.3.10: June 1 2001</h3>
				1143	<ul>
				1144	<li>fixed the SGML catalog support</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1145	<li>a number of reported bugs got fixed, in XPath, iconv detection,
				1146	XInclude processing</li>
Daniel Veillard	2e4f188	2001-06-01 10:11:57 +0000	[diff] [blame]	1147	<li>XPath string function should now handle unicode correctly</li>
				1148	</ul>
				1149
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1150	<h3>2.3.9: May 19 2001</h3>
				1151
				1152	<p>Lots of bugfixes, and added a basic SGML catalog support:</p>
				1153	<ul>
				1154	<li>HTML push bugfix #54891 and another patch from Jonas Borgström</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1155	<li>some serious speed optimization again</li>
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1156	<li>some documentation cleanups</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1157	<li>trying to get better linking on Solaris (-R)</li>
Daniel Veillard	4623acd	2001-05-19 15:13:15 +0000	[diff] [blame]	1158	<li>XPath API cleanup from Thomas Broyer</li>
				1159	<li>Validation bug fixed #54631, added a patch from Gary Pennington, fixed
				1160	xmlValidGetValidElements()</li>
				1161	<li>Added an INSTALL file</li>
				1162	<li>Attribute removal added to API: #54433</li>
				1163	<li>added a basic support for SGML catalogs</li>
				1164	<li>fixed xmlKeepBlanksDefault(0) API</li>
				1165	<li>bugfix in xmlNodeGetLang()</li>
				1166	<li>fixed a small configure portability problem</li>
				1167	<li>fixed an inversion of SYSTEM and PUBLIC identifier in HTML document</li>
				1168	</ul>
				1169
Daniel Veillard	a265af7	2001-05-14 11:13:58 +0000	[diff] [blame]	1170	<h3>1.8.13: May 14 2001</h3>
				1171	<ul>
				1172	<li>bugfixes release of the old libxml1 branch used by Gnome</li>
				1173	</ul>
				1174
Daniel Veillard	3bbbe6f	2001-05-03 11:15:37 +0000	[diff] [blame]	1175	<h3>2.3.8: May 3 2001</h3>
				1176	<ul>
				1177	<li>Integrated an SGML DocBook parser for the Gnome project</li>
				1178	<li>Fixed a few things in the HTML parser</li>
				1179	<li>Fixed some XPath bugs raised by XSLT use, tried to fix the floating
				1180	point portability issue</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1181	<li>Speed improvement (8M/s for SAX, 3M/s for DOM, 1.5M/s for
				1182	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]	1183	<li>incorporated more Windows cleanup</li>
				1184	<li>added xmlSaveFormatFile()</li>
				1185	<li>fixed problems in copying nodes with entities references (gdome)</li>
				1186	<li>removed some troubles surrounding the new validation module</li>
				1187	</ul>
				1188
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1189	<h3>2.3.7: April 22 2001</h3>
				1190	<ul>
				1191	<li>lots of small bug fixes, corrected XPointer</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1192	<li>Non deterministic content model validation support</li>
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1193	<li>added xmlDocCopyNode for gdome2</li>
				1194	<li>revamped the way the HTML parser handles end of tags</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1195	<li>XPath: corrections of namespaces support and number formatting</li>
Daniel Veillard	a41123c	2001-04-22 19:31:20 +0000	[diff] [blame]	1196	<li>Windows: Igor Zlatkovic patches for MSC compilation</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1197	<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]	1198	<li>Improved validation speed sensible for DocBook</li>
				1199	<li>fixed a big bug with ID declared in external parsed entities</li>
				1200	<li>portability fixes, update of Trio from Bjorn Reese</li>
				1201	</ul>
				1202
Daniel Veillard	afc7311	2001-04-11 11:51:41 +0000	[diff] [blame]	1203	<h3>2.3.6: April 8 2001</h3>
				1204	<ul>
				1205	<li>Code cleanup using extreme gcc compiler warning options, found and
				1206	cleared half a dozen potential problem</li>
				1207	<li>the Eazel team found an XML parser bug</li>
				1208	<li>cleaned up the user of some of the string formatting function. used the
				1209	trio library code to provide the one needed when the platform is missing
				1210	them</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1211	<li>xpath: removed a memory leak and fixed the predicate evaluation
				1212	problem, extended the testsuite and cleaned up the result. XPointer seems
				1213	broken ...</li>
Daniel Veillard	afc7311	2001-04-11 11:51:41 +0000	[diff] [blame]	1214	</ul>
				1215
Daniel Veillard	56a4cb8	2001-03-24 17:00:36 +0000	[diff] [blame]	1216	<h3>2.3.5: Mar 23 2001</h3>
				1217	<ul>
				1218	<li>Biggest change is separate parsing and evaluation of XPath expressions,
				1219	there is some new APIs for this too</li>
				1220	<li>included a number of bug fixes(XML push parser, 51876, notations,
				1221	52299)</li>
				1222	<li>Fixed some portability issues</li>
				1223	</ul>
				1224
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	1225	<h3>2.3.4: Mar 10 2001</h3>
				1226	<ul>
				1227	<li>Fixed bugs #51860 and #51861</li>
				1228	<li>Added a global variable xmlDefaultBufferSize to allow default buffer
				1229	size to be application tunable.</li>
				1230	<li>Some cleanup in the validation code, still a bug left and this part
				1231	should probably be rewritten to support ambiguous content model :-\</li>
				1232	<li>Fix a couple of serious bugs introduced or raised by changes in 2.3.3
				1233	parser</li>
				1234	<li>Fixed another bug in xmlNodeGetContent()</li>
				1235	<li>Bjorn fixed XPath node collection and Number formatting</li>
				1236	<li>Fixed a loop reported in the HTML parsing</li>
				1237	<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]	1238	are formatting spaces, this is for XML conformance</li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	1239	</ul>
				1240
Daniel Veillard	b402c07	2001-03-01 17:28:58 +0000	[diff] [blame]	1241	<h3>2.3.3: Mar 1 2001</h3>
				1242	<ul>
				1243	<li>small change in XPath for XSLT</li>
				1244	<li>documentation cleanups</li>
				1245	<li>fix in validation by Gary Pennington</li>
				1246	<li>serious parsing performances improvements</li>
				1247	</ul>
				1248
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1249	<h3>2.3.2: Feb 24 2001</h3>
Daniel Veillard	7168110	2001-02-24 17:48:53 +0000	[diff] [blame]	1250	<ul>
				1251	<li>chasing XPath bugs, found a bunch, completed some TODO</li>
				1252	<li>fixed a Dtd parsing bug</li>
				1253	<li>fixed a bug in xmlNodeGetContent</li>
				1254	<li>ID/IDREF support partly rewritten by Gary Pennington</li>
				1255	</ul>
				1256
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1257	<h3>2.3.1: Feb 15 2001</h3>
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1258	<ul>
				1259	<li>some XPath and HTML bug fixes for XSLT</li>
				1260	<li>small extension of the hash table interfaces for DOM gdome2
				1261	implementation</li>
				1262	<li>A few bug fixes</li>
				1263	</ul>
				1264
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1265	<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]	1266	<ul>
				1267	<li>Lots of XPath bug fixes</li>
				1268	<li>Add a mode with Dtd lookup but without validation error reporting for
				1269	XSLT</li>
				1270	<li>Add support for text node without escaping (XSLT)</li>
				1271	<li>bug fixes for xmlCheckFilename</li>
				1272	<li>validation code bug fixes from Gary Pennington</li>
				1273	<li>Patch from Paul D. Smith correcting URI path normalization</li>
				1274	<li>Patch to allow simultaneous install of libxml-devel and
				1275	libxml2-devel</li>
				1276	<li>the example Makefile is now fixed</li>
				1277	<li>added HTML to the RPM packages</li>
				1278	<li>tree copying bugfixes</li>
				1279	<li>updates to Windows makefiles</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1280	<li>optimization patch from Bjorn Reese</li>
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1281	</ul>
				1282
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	1283	<h3>2.2.11: Jan 4 2001</h3>
Daniel Veillard	503b893	2001-01-05 06:36:31 +0000	[diff] [blame]	1284	<ul>
				1285	<li>bunch of bug fixes (memory I/O, xpath, ftp/http, ...)</li>
				1286	<li>added htmlHandleOmittedElem()</li>
				1287	<li>Applied Bjorn Reese's IPV6 first patch</li>
				1288	<li>Applied Paul D. Smith patches for validation of XInclude results</li>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	1289	<li>added XPointer xmlns() new scheme support</li>
Daniel Veillard	503b893	2001-01-05 06:36:31 +0000	[diff] [blame]	1290	</ul>
				1291
Daniel Veillard	2ddd23d	2000-11-25 10:42:19 +0000	[diff] [blame]	1292	<h3>2.2.10: Nov 25 2000</h3>
Daniel Veillard	9d343c4	2000-11-25 10:12:43 +0000	[diff] [blame]	1293	<ul>
				1294	<li>Fix the Windows problems of 2.2.8</li>
				1295	<li>integrate OpenVMS patches</li>
				1296	<li>better handling of some nasty HTML input</li>
				1297	<li>Improved the XPointer implementation</li>
				1298	<li>integrate a number of provided patches</li>
				1299	</ul>
				1300
Daniel Veillard	2ddd23d	2000-11-25 10:42:19 +0000	[diff] [blame]	1301	<h3>2.2.9: Nov 25 2000</h3>
				1302	<ul>
				1303	<li>erroneous release :-(</li>
				1304	</ul>
				1305
Daniel Veillard	28929b2	2000-11-13 18:22:49 +0000	[diff] [blame]	1306	<h3>2.2.8: Nov 13 2000</h3>
				1307	<ul>
				1308	<li>First version of <a href="http://www.w3.org/TR/xinclude">XInclude</a>
				1309	support</li>
				1310	<li>Patch in conditional section handling</li>
				1311	<li>updated MS compiler project</li>
				1312	<li>fixed some XPath problems</li>
				1313	<li>added an URI escaping function</li>
				1314	<li>some other bug fixes</li>
				1315	</ul>
				1316
				1317	<h3>2.2.7: Oct 31 2000</h3>
				1318	<ul>
				1319	<li>added message redirection</li>
				1320	<li>XPath improvements (thanks TOM !)</li>
				1321	<li>xmlIOParseDTD() added</li>
				1322	<li>various small fixes in the HTML, URI, HTTP and XPointer support</li>
				1323	<li>some cleanup of the Makefile, autoconf and the distribution content</li>
				1324	</ul>
				1325
Daniel Veillard	29a11cc	2000-10-25 13:32:39 +0000	[diff] [blame]	1326	<h3>2.2.6: Oct 25 2000:</h3>
				1327	<ul>
				1328	<li>Added an hash table module, migrated a number of internal structure to
				1329	those</li>
				1330	<li>Fixed a posteriori validation problems</li>
				1331	<li>HTTP module cleanups</li>
				1332	<li>HTML parser improvements (tag errors, script/style handling, attribute
				1333	normalization)</li>
				1334	<li>coalescing of adjacent text nodes</li>
				1335	<li>couple of XPath bug fixes, exported the internal API</li>
				1336	</ul>
				1337
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	1338	<h3>2.2.5: Oct 15 2000:</h3>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	1339	<ul>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	1340	<li>XPointer implementation and testsuite</li>
				1341	<li>Lot of XPath fixes, added variable and functions registration, more
				1342	tests</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1343	<li>Portability fixes, lots of enhancements toward an easy Windows build
				1344	and release</li>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	1345	<li>Late validation fixes</li>
				1346	<li>Integrated a lot of contributed patches</li>
				1347	<li>added memory management docs</li>
Daniel Veillard	ab8500d	2000-10-15 21:06:19 +0000	[diff] [blame]	1348	<li>a performance problem when using large buffer seems fixed</li>
Daniel Veillard	189446d	2000-10-13 10:23:06 +0000	[diff] [blame]	1349	</ul>
				1350
				1351	<h3>2.2.4: Oct 1 2000:</h3>
				1352	<ul>
				1353	<li>main XPath problem fixed</li>
				1354	<li>Integrated portability patches for Windows</li>
				1355	<li>Serious bug fixes on the URI and HTML code</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	1356	</ul>
				1357
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	1358	<h3>2.2.3: Sep 17 2000</h3>
				1359	<ul>
				1360	<li>bug fixes</li>
				1361	<li>cleanup of entity handling code</li>
				1362	<li>overall review of all loops in the parsers, all sprintf usage has been
				1363	checked too</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1364	<li>Far better handling of larges Dtd. Validating against DocBook XML Dtd
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	1365	works smoothly now.</li>
				1366	</ul>
				1367
				1368	<h3>1.8.10: Sep 6 2000</h3>
				1369	<ul>
				1370	<li>bug fix release for some Gnome projects</li>
				1371	</ul>
				1372
				1373	<h3>2.2.2: August 12 2000</h3>
Daniel Veillard	786d7c8	2000-08-12 23:38:57 +0000	[diff] [blame]	1374	<ul>
				1375	<li>mostly bug fixes</li>
Daniel Veillard	ec78c0f	2000-08-25 10:25:23 +0000	[diff] [blame]	1376	<li>started adding routines to access xml parser context options</li>
Daniel Veillard	786d7c8	2000-08-12 23:38:57 +0000	[diff] [blame]	1377	</ul>
				1378
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	1379	<h3>2.2.1: July 21 2000</h3>
Daniel Veillard	a2679fa	2000-07-22 02:38:15 +0000	[diff] [blame]	1380	<ul>
				1381	<li>a purely bug fixes release</li>
				1382	<li>fixed an encoding support problem when parsing from a memory block</li>
				1383	<li>fixed a DOCTYPE parsing problem</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1384	<li>removed a bug in the function allowing to override the memory
				1385	allocation routines</li>
Daniel Veillard	a2679fa	2000-07-22 02:38:15 +0000	[diff] [blame]	1386	</ul>
				1387
Daniel Veillard	d5f97f8	2000-09-17 16:38:14 +0000	[diff] [blame]	1388	<h3>2.2.0: July 14 2000</h3>
Daniel Veillard	94e9060	2000-07-17 14:38:19 +0000	[diff] [blame]	1389	<ul>
				1390	<li>applied a lot of portability fixes</li>
				1391	<li>better encoding support/cleanup and saving (content is now always
				1392	encoded in UTF-8)</li>
				1393	<li>the HTML parser now correctly handles encodings</li>
				1394	<li>added xmlHasProp()</li>
				1395	<li>fixed a serious problem with &#38;</li>
				1396	<li>propagated the fix to FTP client</li>
				1397	<li>cleanup, bugfixes, etc ...</li>
				1398	<li>Added a page about <a href="encoding.html">libxml Internationalization
				1399	support</a></li>
				1400	</ul>
				1401
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	1402	<h3>1.8.9: July 9 2000</h3>
				1403	<ul>
				1404	<li>fixed the spec the RPMs should be better</li>
				1405	<li>fixed a serious bug in the FTP implementation, released 1.8.9 to solve
				1406	rpmfind users problem</li>
				1407	</ul>
				1408
Daniel Veillard	6388e17	2000-07-03 16:07:19 +0000	[diff] [blame]	1409	<h3>2.1.1: July 1 2000</h3>
				1410	<ul>
				1411	<li>fixes a couple of bugs in the 2.1.0 packaging</li>
				1412	<li>improvements on the HTML parser</li>
				1413	</ul>
				1414
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	1415	<h3>2.1.0 and 1.8.8: June 29 2000</h3>
				1416	<ul>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1417	<li>1.8.8 is mostly a commodity package for upgrading to libxml2 according
				1418	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]	1419	about &#38; charref parsing</li>
				1420	<li>2.1.0 also ease the upgrade from libxml v1 to the recent version. it
				1421	also contains numerous fixes and enhancements:
				1422	<ul>
				1423	<li>added xmlStopParser() to stop parsing</li>
				1424	<li>improved a lot parsing speed when there is large CDATA blocs</li>
				1425	<li>includes XPath patches provided by Picdar Technology</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1426	<li>tried to fix as much as possible DTD validation and namespace
Daniel Veillard	3f6f7f6	2000-06-30 17:58:25 +0000	[diff] [blame]	1427	related problems</li>
				1428	<li>output to a given encoding has been added/tested</li>
				1429	<li>lot of various fixes</li>
				1430	</ul>
				1431	</li>
				1432	</ul>
				1433
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	1434	<h3>2.0.0: Apr 12 2000</h3>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	1435	<ul>
				1436	<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]	1437	idea to check the 1.x to 2.x upgrade instructions. NOTE: while initially
				1438	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]	1439	workload.</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	1440	<li>The include are now located under $prefix/include/libxml (instead of
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	1441	$prefix/include/gnome-xml), they also are referenced by
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	1442	<pre>#include <libxml/xxx.h></pre>
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	1443	<p>instead of</p>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	1444	<pre>#include "xxx.h"</pre>
				1445	</li>
Daniel Veillard	8f62198	2000-03-20 13:07:15 +0000	[diff] [blame]	1446	<li>a new URI module for parsing URIs and following strictly RFC 2396</li>
				1447	<li>the memory allocation routines used by libxml can now be overloaded
				1448	dynamically by using xmlMemSetup()</li>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	1449	<li>The previously CVS only tool tester has been renamed
				1450	<strong>xmllint</strong> and is now installed as part of the libxml2
				1451	package</li>
Daniel Veillard	e0aed30	2000-04-16 08:52:20 +0000	[diff] [blame]	1452	<li>The I/O interface has been revamped. There is now ways to plug in
				1453	specific I/O modules, either at the URI scheme detection level using
				1454	xmlRegisterInputCallbacks() or by passing I/O functions when creating a
				1455	parser context using xmlCreateIOParserCtxt()</li>
				1456	<li>there is a C preprocessor macro LIBXML_VERSION providing the version
				1457	number of the libxml module in use</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1458	<li>a number of optional features of libxml can now be excluded at
				1459	configure time (FTP/HTTP/HTML/XPath/Debug)</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1460	</ul>
				1461
				1462	<h3>2.0.0beta: Mar 14 2000</h3>
				1463	<ul>
				1464	<li>This is a first Beta release of libxml version 2</li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	1465	<li>It's available only from<a href="ftp://xmlsoft.org/">xmlsoft.org
				1466	FTP</a>, it's packaged as libxml2-2.0.0beta and available as tar and
				1467	RPMs</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1468	<li>This version is now the head in the Gnome CVS base, the old one is
				1469	available under the tag LIB_XML_1_X</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1470	<li>This includes a very large set of changes. From a programmatic point
				1471	of view applications should not have to be modified too much, check the
				1472	<a href="upgrade.html">upgrade page</a></li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1473	<li>Some interfaces may changes (especially a bit about encoding).</li>
				1474	<li>the updates includes:
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	1475	<ul>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1476	<li>fix I18N support. ISO-Latin-x/UTF-8/UTF-16 (nearly) seems correctly
				1477	handled now</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1478	<li>Better handling of entities, especially well-formedness checking
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1479	and proper PEref extensions in external subsets</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	1480	<li>DTD conditional sections</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1481	<li>Validation now correctly handle entities content</li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	1482	<li><a href="http://rpmfind.net/tools/gdome/messages/0039.html">change
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1483	structures to accommodate DOM</a></li>
Daniel Veillard	6c8b117	2000-03-01 00:40:41 +0000	[diff] [blame]	1484	</ul>
				1485	</li>
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1486	<li>Serious progress were made toward compliance, <a
				1487	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]	1488	OASIS testsuite (except the Japanese tests since I don't support that
Daniel Veillard	edfb29b	2000-03-14 19:59:05 +0000	[diff] [blame]	1489	encoding yet). This URL is rebuilt every couple of hours using the CVS
				1490	head version.</li>
Daniel Veillard	e41f2b7	2000-01-30 20:00:07 +0000	[diff] [blame]	1491	</ul>
				1492
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	1493	<h3>1.8.7: Mar 6 2000</h3>
				1494	<ul>
				1495	<li>This is a bug fix release:</li>
				1496	<li>It is possible to disable the ignorable blanks heuristic used by
				1497	libxml-1.x, a new function xmlKeepBlanksDefault(0) will allow this. Note
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1498	that for adherence to XML spec, this behaviour will be disabled by
				1499	default in 2.x . The same function will allow to keep compatibility for
				1500	old code.</li>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	1501	<li>Blanks in <a> </a> constructs are not ignored anymore,
				1502	avoiding heuristic is really the Right Way :-\</li>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	1503	<li>The unchecked use of snprintf which was breaking libxml-1.8.6
				1504	compilation on some platforms has been fixed</li>
				1505	<li>nanoftp.c nanohttp.c: Fixed '#' and '?' stripping when processing
				1506	URIs</li>
				1507	</ul>
				1508
Daniel Veillard	e41f2b7	2000-01-30 20:00:07 +0000	[diff] [blame]	1509	<h3>1.8.6: Jan 31 2000</h3>
				1510	<ul>
				1511	<li>added a nanoFTP transport module, debugged until the new version of <a
				1512	href="http://rpmfind.net/linux/rpm2html/rpmfind.html">rpmfind</a> can use
				1513	it without troubles</li>
Daniel Veillard	da07c34	2000-01-25 18:31:22 +0000	[diff] [blame]	1514	</ul>
				1515
				1516	<h3>1.8.5: Jan 21 2000</h3>
				1517	<ul>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	1518	<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]	1519	href="http://www.w3.org/TR/REC-xml#NT-content">[43] content</a> of the
				1520	XML spec)</li>
Daniel Veillard	461a66c	2000-01-18 18:01:01 +0000	[diff] [blame]	1521	<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]	1522	<li>Jody Goldberg <jgoldberg@home.com> provided another patch trying
				1523	to solve the zlib checks problems</li>
Daniel Veillard	461a66c	2000-01-18 18:01:01 +0000	[diff] [blame]	1524	<li>The current state in gnome CVS base is expected to ship as 1.8.5 with
				1525	gnumeric soon</li>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	1526	</ul>
				1527
				1528	<h3>1.8.4: Jan 13 2000</h3>
				1529	<ul>
				1530	<li>bug fixes, reintroduced xmlNewGlobalNs(), fixed xmlNewNs()</li>
				1531	<li>all exit() call should have been removed from libxml</li>
				1532	<li>fixed a problem with INCLUDE_WINSOCK on WIN32 platform</li>
				1533	<li>added newDocFragment()</li>
Daniel Veillard	f84f71f	2000-01-05 19:54:23 +0000	[diff] [blame]	1534	</ul>
				1535
				1536	<h3>1.8.3: Jan 5 2000</h3>
				1537	<ul>
				1538	<li>a Push interface for the XML and HTML parsers</li>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	1539	<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]	1540	<li>lots of bug fixes and improvement added over XMas holidays</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	1541	<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]	1542	<li>added xmlRemoveProp(), xmlRemoveID() and xmlRemoveRef()</li>
				1543	<li>Fixed bugs in xmlNewNs()</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	1544	<li>External entity loading code has been revamped, now it uses
Daniel Veillard	f84f71f	2000-01-05 19:54:23 +0000	[diff] [blame]	1545	xmlLoadExternalEntity(), some fix on entities processing were added</li>
Daniel Veillard	437b87b	2000-01-03 17:30:46 +0000	[diff] [blame]	1546	<li>cleaned up WIN32 includes of socket stuff</li>
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	1547	</ul>
				1548
				1549	<h3>1.8.2: Dec 21 1999</h3>
				1550	<ul>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	1551	<li>I got another problem with includes and C++, I hope this issue is fixed
				1552	for good this time</li>
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	1553	<li>Added a few tree modification functions: xmlReplaceNode,
				1554	xmlAddPrevSibling, xmlAddNextSibling, xmlNodeSetName and
				1555	xmlDocSetRootElement</li>
				1556	<li>Tried to improve the HTML output with help from <a
				1557	href="mailto:clahey@umich.edu">Chris Lahey</a></li>
Daniel Veillard	e4e5131	1999-12-18 15:32:46 +0000	[diff] [blame]	1558	</ul>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	1559
Daniel Veillard	e4e5131	1999-12-18 15:32:46 +0000	[diff] [blame]	1560	<h3>1.8.1: Dec 18 1999</h3>
				1561	<ul>
				1562	<li>various patches to avoid troubles when using libxml with C++ compilers
				1563	the "namespace" keyword and C escaping in include files</li>
				1564	<li>a problem in one of the core macros IS_CHAR was corrected</li>
				1565	<li>fixed a bug introduced in 1.8.0 breaking default namespace processing,
				1566	and more specifically the Dia application</li>
Daniel Veillard	944b5ff	1999-12-15 19:08:24 +0000	[diff] [blame]	1567	<li>fixed a posteriori validation (validation after parsing, or by using a
				1568	Dtd not specified in the original document)</li>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	1569	<li>fixed a bug in</li>
Daniel Veillard	10a2c65	1999-12-12 13:03:50 +0000	[diff] [blame]	1570	</ul>
				1571
				1572	<h3>1.8.0: Dec 12 1999</h3>
				1573	<ul>
				1574	<li>cleanup, especially memory wise</li>
				1575	<li>the parser should be more reliable, especially the HTML one, it should
				1576	not crash, whatever the input !</li>
				1577	<li>Integrated various patches, especially a speedup improvement for large
				1578	dataset from <a href="mailto:cnygard@bellatlantic.net">Carl Nygard</a>,
				1579	configure with --with-buffers to enable them.</li>
				1580	<li>attribute normalization, oops should have been added long ago !</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1581	<li>attributes defaulted from DTDs should be available, xmlSetProp() now
				1582	does entities escaping by default.</li>
Daniel Veillard	4c3a203	1999-11-19 17:46:26 +0000	[diff] [blame]	1583	</ul>
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	1584
				1585	<h3>1.7.4: Oct 25 1999</h3>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1586	<ul>
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	1587	<li>Lots of HTML improvement</li>
				1588	<li>Fixed some errors when saving both XML and HTML</li>
				1589	<li>More examples, the regression tests should now look clean</li>
				1590	<li>Fixed a bug with contiguous charref</li>
				1591	</ul>
				1592
				1593	<h3>1.7.3: Sep 29 1999</h3>
				1594	<ul>
				1595	<li>portability problems fixed</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1596	<li>snprintf was used unconditionally, leading to link problems on system
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	1597	were it's not available, fixed</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1598	</ul>
				1599
				1600	<h3>1.7.1: Sep 24 1999</h3>
				1601	<ul>
				1602	<li>The basic type for strings manipulated by libxml has been renamed in
				1603	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]	1604	is that CHAR was conflicting with a predefined type on Windows. However
				1605	on non WIN32 environment, compatibility is provided by the way of a
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1606	<strong>#define </strong>.</li>
				1607	<li>Changed another error : the use of a structure field called errno, and
				1608	leading to troubles on platforms where it's a macro</li>
				1609	</ul>
				1610
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1611	<h3>1.7.0: Sep 23 1999</h3>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1612	<ul>
				1613	<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]	1614	href="html/libxml-nanohttp.html">nanohttp</a> module.</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1615	<li>Added an errno to report errors by another mean than a simple printf
				1616	like callback</li>
				1617	<li>Finished ID/IDREF support and checking when validation</li>
				1618	<li>Serious memory leaks fixed (there is now a <a
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	1619	href="html/libxml-xmlmemory.html">memory wrapper</a> module)</li>
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	1620	<li>Improvement of <a href="http://www.w3.org/TR/xpath">XPath</a>
				1621	implementation</li>
				1622	<li>Added an HTML parser front-end</li>
				1623	</ul>
				1624
				1625	<h2><a name="XML">XML</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	1626
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	1627	<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]	1628	markup-based structured documents. Here is <a name="example">an example XML
				1629	document</a>:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	1630	<pre><?xml version="1.0"?>
				1631	<EXAMPLE prop1="gnome is great" prop2="&amp; linux too">
				1632	<head>
				1633	<title>Welcome to Gnome</title>
				1634	</head>
				1635	<chapter>
				1636	<title>The Linux adventure</title>
				1637	<p>bla bla bla ...</p>
				1638	<image href="linus.gif"/>
				1639	<p>...</p>
				1640	</chapter>
				1641	</EXAMPLE></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	1642
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1643	<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]	1644	information about its encoding. Then the rest of the document is a text
				1645	format whose structure is specified by tags between brackets. <strong>Each
				1646	tag opened has to be closed</strong>. XML is pedantic about this. However, if
				1647	a tag is empty (no content), a single tag can serve as both the opening and
				1648	closing tag if it ends with <code>/></code> rather than with
				1649	<code>></code>. Note that, for example, the image tag has no content (just
				1650	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]	1651
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	1652	<p>XML can be applied successfully to a wide range of tasks, ranging from
				1653	long term structured document maintenance (where it follows the steps of
				1654	SGML) to simple data encoding mechanisms like configuration file formatting
				1655	(glade), spreadsheets (gnumeric), or even shorter lived documents such as
				1656	WebDAV where it is used to encode remote calls between a client and a
				1657	server.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	1658
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	1659	<h2><a name="XSLT">XSLT</a></h2>
				1660
Daniel Veillard	6e6a6cc	2001-02-15 15:55:44 +0000	[diff] [blame]	1661	<p>Check <a href="http://xmlsoft.org/XSLT">the separate libxslt page</a></p>
				1662
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1663	<p><a href="http://www.w3.org/TR/xslt">XSL Transformations</a>, is a
				1664	language for transforming XML documents into other XML documents (or
				1665	HTML/textual output).</p>
Daniel Veillard	8268716	2001-01-22 15:32:01 +0000	[diff] [blame]	1666
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	1667	<p>A separate library called libxslt is being developed on top of libxml2.
				1668	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]	1669
Daniel Veillard	383b147	2001-01-23 11:39:52 +0000	[diff] [blame]	1670	<p>You can check the <a
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	1671	href="http://cvs.gnome.org/lxr/source/libxslt/FEATURES">features</a>
				1672	supported and the progresses on the <a
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1673	href="http://cvs.gnome.org/lxr/source/libxslt/ChangeLog"
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1674	name="Changelog">Changelog</a>.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1675
				1676	<h2><a name="Python">Python and bindings</a></h2>
				1677
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	1678	<p>There are a number of language bindings and wrappers available for
				1679	libxml2, the list below is not exhaustive. Please contact the <a
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1680	href="http://mail.gnome.org/mailman/listinfo/xml-bindings">xml-bindings@gnome.org</a>
				1681	(<a href="http://mail.gnome.org/archives/xml-bindings/">archives</a>) in
				1682	order to get updates to this list or to discuss the specific topic of libxml2
				1683	or libxslt wrappers or bindings:</p>
				1684	<ul>
Daniel Veillard	c14401e	2002-11-20 14:28:17 +0000	[diff] [blame]	1685	<li><a href="http://libxmlplusplus.sourceforge.net/">Libxml++</a> seems the
				1686	most up-to-date C++ bindings for libxml2, check the <a
				1687	href="http://libxmlplusplus.sourceforge.net/reference/html/hierarchy.html">documentation</a>
				1688	and the <a
				1689	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]	1690	<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]	1691	based on the gdome2 bindings</a> maintained by Tobias Peters.</li>
Daniel Veillard	9b6fd30	2002-05-13 12:06:47 +0000	[diff] [blame]	1692	<li>and a third C++ wrapper by Peter Jones <pjones@pmade.org>
				1693	<p>Website: <a
				1694	href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
				1695	</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1696	<li><a
				1697	href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1698	Sergeant</a> developed <a
				1699	href="http://axkit.org/download/">XML::LibXSLT</a>, a Perl wrapper for
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1700	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]	1701	application server</a>.</li>
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	1702	<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]	1703	earlier version of the libxml/libxslt <a
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1704	href="http://www.rexx.com/~dkuhlman">wrappers for Python</a>.</li>
Daniel Veillard	2147367	2002-06-17 07:29:22 +0000	[diff] [blame]	1705	<li>Gopal.V and Peter Minten develop <a
				1706	href="http://savannah.gnu.org/projects/libxmlsharp">libxml#</a>, a set of
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1707	C# libxml2 bindings.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1708	<li>Petr Kozelka provides <a
				1709	href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1710	libxml2</a> with Kylix, Delphi and other Pascal compilers.</li>
Daniel Veillard	b2fb8ed	2002-04-01 09:33:12 +0000	[diff] [blame]	1711	<li>Uwe Fechner also provides <a
				1712	href="http://sourceforge.net/projects/idom2-pas/">idom2</a>, a DOM2
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1713	implementation for Kylix2/D5/D6 from Borland.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1714	<li>Wai-Sun "Squidster" Chia provides <a
				1715	href="http://www.rubycolor.org/arc/redist/">bindings for Ruby</a> and
				1716	libxml2 bindings are also available in Ruby through the <a
				1717	href="http://libgdome-ruby.berlios.de/">libgdome-ruby</a> module
				1718	maintained by Tobias Peters.</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1719	<li>Steve Ball and contributors maintains <a
				1720	href="http://tclxml.sourceforge.net/">libxml2 and libxslt bindings for
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1721	Tcl</a>.</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1722	<li>There is support for libxml2 in the DOM module of PHP.</li>
Daniel Veillard	41b01a8	2003-02-27 11:09:06 +0000	[diff] [blame]	1723	<li><a href="http://savannah.gnu.org/projects/classpathx/">LibxmlJ</a> is
Daniel Veillard	806cada	2003-03-19 21:58:59 +0000	[diff] [blame]	1724	an effort to create a 100% JAXP-compatible Java wrapper for libxml2 and
				1725	libxslt as part of GNU ClasspathX project.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1726	</ul>
				1727
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1728	<p>The distribution includes a set of Python bindings, which are guaranteed
				1729	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]	1730	interface have not yet reached the completeness of the C API.</p>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	1731
Daniel Veillard	27907c7	2002-12-16 16:05:58 +0000	[diff] [blame]	1732	<p><a href="mailto:stephane.bidoul@softwareag.com">Stéphane Bidoul</a>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	1733	maintains <a href="http://users.skynet.be/sbi/libxml-python/">a Windows port
				1734	of the Python bindings</a>.</p>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1735
Daniel Veillard	7ef0fcb	2002-12-14 10:38:55 +0000	[diff] [blame]	1736	<p>Note to people interested in building bindings, the API is formalized as
				1737	<a href="libxml2-api.xml">an XML API description file</a> which allows to
				1738	automate a large part of the Python bindings, this includes function
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	1739	descriptions, enums, structures, typedefs, etc... The Python script used to
				1740	build the bindings is python/generator.py in the source distribution.</p>
Daniel Veillard	7ef0fcb	2002-12-14 10:38:55 +0000	[diff] [blame]	1741
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1742	<p>To install the Python bindings there are 2 options:</p>
Daniel Veillard	0b79dfe	2002-02-23 13:02:31 +0000	[diff] [blame]	1743	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1744	<li>If you use an RPM based distribution, simply install the <a
				1745	href="http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python">libxml2-python
				1746	RPM</a> (and if needed the <a
				1747	href="http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python">libxslt-python
				1748	RPM</a>).</li>
				1749	<li>Otherwise use the <a href="ftp://xmlsoft.org/python/">libxml2-python
				1750	module distribution</a> corresponding to your installed version of
				1751	libxml2 and libxslt. Note that to install it you will need both libxml2
				1752	and libxslt installed and run "python setup.py build install" in the
				1753	module tree.</li>
Daniel Veillard	0b79dfe	2002-02-23 13:02:31 +0000	[diff] [blame]	1754	</ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1755
				1756	<p>The distribution includes a set of examples and regression tests for the
				1757	python bindings in the <code>python/tests</code> directory. Here are some
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1758	excerpts from those tests:</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1759
				1760	<h3>tst.py:</h3>
				1761
				1762	<p>This is a basic test of the file interface and DOM navigation:</p>
				1763	<pre>import libxml2
				1764
				1765	doc = libxml2.parseFile("tst.xml")
				1766	if doc.name != "tst.xml":
				1767	print "doc.name failed"
				1768	sys.exit(1)
				1769	root = doc.children
				1770	if root.name != "doc":
				1771	print "root.name failed"
				1772	sys.exit(1)
				1773	child = root.children
				1774	if child.name != "foo":
				1775	print "child.name failed"
				1776	sys.exit(1)
				1777	doc.freeDoc()</pre>
				1778
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	1779	<p>The Python module is called libxml2; parseFile is the equivalent of
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1780	xmlParseFile (most of the bindings are automatically generated, and the xml
				1781	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]	1782	binding level share the same subset of accessors:</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1783	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1784	<li><code>name</code> : returns the node name</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	1785	<li><code>type</code> : returns a string indicating the node type</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1786	<li><code>content</code> : returns the content of the node, it is based on
				1787	xmlNodeGetContent() and hence is recursive.</li>
				1788	<li><code>parent</code> , <code>children</code>, <code>last</code>,
				1789	<code>next</code>, <code>prev</code>, <code>doc</code>,
				1790	<code>properties</code>: pointing to the associated element in the tree,
				1791	those may return None in case no such link exists.</li>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1792	</ul>
				1793
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1794	<p>Also note the need to explicitly deallocate documents with freeDoc() .
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1795	Reference counting for libxml2 trees would need quite a lot of work to
				1796	function properly, and rather than risk memory leaks if not implemented
				1797	correctly it sounds safer to have an explicit function to free a tree. The
				1798	wrapper python objects like doc, root or child are them automatically garbage
				1799	collected.</p>
				1800
				1801	<h3>validate.py:</h3>
				1802
				1803	<p>This test check the validation interfaces and redirection of error
				1804	messages:</p>
				1805	<pre>import libxml2
				1806
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1807	#deactivate error messages from the validation
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1808	def noerr(ctx, str):
				1809	pass
				1810
				1811	libxml2.registerErrorHandler(noerr, None)
				1812
				1813	ctxt = libxml2.createFileParserCtxt("invalid.xml")
				1814	ctxt.validate(1)
				1815	ctxt.parseDocument()
				1816	doc = ctxt.doc()
				1817	valid = ctxt.isValid()
				1818	doc.freeDoc()
				1819	if valid != 0:
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1820	print "validity check failed"</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1821
				1822	<p>The first thing to notice is the call to registerErrorHandler(), it
				1823	defines a new error handler global to the library. It is used to avoid seeing
				1824	the error messages when trying to validate the invalid document.</p>
				1825
				1826	<p>The main interest of that test is the creation of a parser context with
				1827	createFileParserCtxt() and how the behaviour can be changed before calling
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1828	parseDocument() . Similarly the informations resulting from the parsing phase
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1829	are also available using context methods.</p>
				1830
				1831	<p>Contexts like nodes are defined as class and the libxml2 wrappers maps the
				1832	C function interfaces in terms of objects method as much as possible. The
				1833	best to get a complete view of what methods are supported is to look at the
				1834	libxml2.py module containing all the wrappers.</p>
				1835
				1836	<h3>push.py:</h3>
				1837
				1838	<p>This test show how to activate the push parser interface:</p>
				1839	<pre>import libxml2
				1840
				1841	ctxt = libxml2.createPushParser(None, "<foo", 4, "test.xml")
				1842	ctxt.parseChunk("/>", 2, 1)
				1843	doc = ctxt.doc()
				1844
				1845	doc.freeDoc()</pre>
				1846
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1847	<p>The context is created with a special call based on the
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1848	xmlCreatePushParser() from the C library. The first argument is an optional
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1849	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]	1850	the resource in case URI-References need to be computed by the parser.</p>
				1851
				1852	<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]	1853	setting the third argument terminate to 1.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1854
				1855	<h3>pushSAX.py:</h3>
				1856
				1857	<p>this test show the use of the event based parsing interfaces. In this case
				1858	the parser does not build a document, but provides callback information as
				1859	the parser makes progresses analyzing the data being provided:</p>
				1860	<pre>import libxml2
				1861	log = ""
				1862
				1863	class callback:
				1864	def startDocument(self):
				1865	global log
				1866	log = log + "startDocument:"
				1867
				1868	def endDocument(self):
				1869	global log
				1870	log = log + "endDocument:"
				1871
				1872	def startElement(self, tag, attrs):
				1873	global log
				1874	log = log + "startElement %s %s:" % (tag, attrs)
				1875
				1876	def endElement(self, tag):
				1877	global log
				1878	log = log + "endElement %s:" % (tag)
				1879
				1880	def characters(self, data):
				1881	global log
				1882	log = log + "characters: %s:" % (data)
				1883
				1884	def warning(self, msg):
				1885	global log
				1886	log = log + "warning: %s:" % (msg)
				1887
				1888	def error(self, msg):
				1889	global log
				1890	log = log + "error: %s:" % (msg)
				1891
				1892	def fatalError(self, msg):
				1893	global log
				1894	log = log + "fatalError: %s:" % (msg)
				1895
				1896	handler = callback()
				1897
				1898	ctxt = libxml2.createPushParser(handler, "<foo", 4, "test.xml")
				1899	chunk = " url='tst'>b"
				1900	ctxt.parseChunk(chunk, len(chunk), 0)
				1901	chunk = "ar</foo>"
				1902	ctxt.parseChunk(chunk, len(chunk), 1)
				1903
Daniel Veillard	fcbfa2d	2002-02-21 17:54:27 +0000	[diff] [blame]	1904	reference = "startDocument:startElement foo {'url': 'tst'}:" + \
				1905	"characters: bar:endElement foo:endDocument:"
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1906	if log != reference:
				1907	print "Error got: %s" % log
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1908	print "Expected: %s" % reference</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1909
				1910	<p>The key object in that test is the handler, it provides a number of entry
				1911	points which can be called by the parser as it makes progresses to indicate
				1912	the information set obtained. The full set of callback is larger than what
				1913	the callback class in that specific example implements (see the SAX
				1914	definition for a complete list). The wrapper will only call those supplied by
				1915	the object when activated. The startElement receives the names of the element
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1916	and a dictionary containing the attributes carried by this element.</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1917
				1918	<p>Also note that the reference string generated from the callback shows a
				1919	single character call even though the string "bar" is passed to the parser
				1920	from 2 different call to parseChunk()</p>
				1921
				1922	<h3>xpath.py:</h3>
				1923
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1924	<p>This is a basic test of XPath wrappers support</p>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1925	<pre>import libxml2
				1926
				1927	doc = libxml2.parseFile("tst.xml")
				1928	ctxt = doc.xpathNewContext()
				1929	res = ctxt.xpathEval("//*")
				1930	if len(res) != 2:
				1931	print "xpath query: wrong node set size"
				1932	sys.exit(1)
				1933	if res[0].name != "doc" or res[1].name != "foo":
				1934	print "xpath query: wrong node set value"
				1935	sys.exit(1)
				1936	doc.freeDoc()
				1937	ctxt.xpathFreeContext()</pre>
				1938
				1939	<p>This test parses a file, then create an XPath context to evaluate XPath
				1940	expression on it. The xpathEval() method execute an XPath query and returns
				1941	the result mapped in a Python way. String and numbers are natively converted,
				1942	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]	1943	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]	1944	the result of the XPath query may point back to the document tree and hence
				1945	the document must be freed after the result of the query is used.</p>
				1946
				1947	<h3>xpathext.py:</h3>
				1948
				1949	<p>This test shows how to extend the XPath engine with functions written in
				1950	python:</p>
				1951	<pre>import libxml2
				1952
				1953	def foo(ctx, x):
				1954	return x + 1
				1955
				1956	doc = libxml2.parseFile("tst.xml")
				1957	ctxt = doc.xpathNewContext()
				1958	libxml2.registerXPathFunction(ctxt._o, "foo", None, foo)
				1959	res = ctxt.xpathEval("foo(1)")
				1960	if res != 2:
				1961	print "xpath extension failure"
				1962	doc.freeDoc()
				1963	ctxt.xpathFreeContext()</pre>
				1964
				1965	<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]	1966	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]	1967
				1968	<h3>tstxpath.py:</h3>
				1969
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	1970	<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]	1971	function can access the XPath evaluation context:</p>
				1972	<pre>def foo(ctx, x):
				1973	global called
				1974
				1975	#
				1976	# test that access to the XPath evaluation contexts
				1977	#
				1978	pctxt = libxml2.xpathParserContext(_obj=ctx)
				1979	ctxt = pctxt.context()
				1980	called = ctxt.function()
				1981	return x + 1</pre>
				1982
				1983	<p>All the interfaces around the XPath parser(or rather evaluation) context
				1984	are not finalized, but it should be sufficient to do contextual work at the
				1985	evaluation point.</p>
				1986
				1987	<h3>Memory debugging:</h3>
				1988
				1989	<p>last but not least, all tests starts with the following prologue:</p>
				1990	<pre>#memory debug specific
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	1991	libxml2.debugMemory(1)</pre>
Daniel Veillard	6dbcaf8	2002-02-20 14:37:47 +0000	[diff] [blame]	1992
				1993	<p>and ends with the following epilogue:</p>
				1994	<pre>#memory debug specific
				1995	libxml2.cleanupParser()
				1996	if libxml2.debugMemory(1) == 0:
				1997	print "OK"
				1998	else:
				1999	print "Memory leak %d bytes" % (libxml2.debugMemory(1))
				2000	libxml2.dumpMemory()</pre>
				2001
				2002	<p>Those activate the memory debugging interface of libxml2 where all
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2003	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]	2004	library state and checks that all allocated memory has been freed. If not it
				2005	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]	2006
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2007	<h2><a name="architecture">libxml architecture</a></h2>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2008
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	2009	<p>Libxml is made of multiple components; some of them are optional, and most
				2010	of the block interfaces are public. The main components are:</p>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2011	<ul>
				2012	<li>an Input/Output layer</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2013	<li>FTP and HTTP client layers (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2014	<li>an Internationalization layer managing the encodings support</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2015	<li>a URI module</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2016	<li>the XML parser and its basic SAX interface</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2017	<li>an HTML parser using the same SAX interface (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2018	<li>a SAX tree module to build an in-memory DOM representation</li>
				2019	<li>a tree module to manipulate the DOM representation</li>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2020	<li>a validation module using the DOM representation (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2021	<li>an XPath module for global lookup in a DOM representation
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	2022	(optional)</li>
				2023	<li>a debug module (optional)</li>
Daniel Veillard	4540be4	2000-08-19 16:40:28 +0000	[diff] [blame]	2024	</ul>
				2025
				2026	<p>Graphically this gives the following:</p>
				2027
				2028	<p><img src="libxml.gif" alt="a graphical view of the various"></p>
				2029
				2030	<p></p>
				2031
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2032	<h2><a name="tree">The tree output</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2033
				2034	<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]	2035	returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2036	<strong>xmlDoc</strong> structure). This structure contains information such
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	2037	as the file name, the document type, and a <strong>children</strong> pointer
				2038	which is the root of the document (or more exactly the first child under the
				2039	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]	2040	chained in double-linked lists of siblings and with a children<->parent
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	2041	relationship. An xmlNode can also carry properties (a chain of xmlAttr
				2042	structures). An attribute may have a value which is a list of TEXT or
				2043	ENTITY_REF nodes.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2044
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2045	<p>Here is an example (erroneous with respect to the XML spec since there
				2046	should be only one ELEMENT under the root):</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2047
				2048	<p><img src="structure.gif" alt=" structure.gif "></p>
				2049
				2050	<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]	2051	called <strong>xmllint</strong> which parses XML files given as argument and
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	2052	prints them back as parsed. This is useful for detecting errors both in XML
				2053	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]	2054	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]	2055	result with the <a href="#example">example</a> given before:</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2056	<pre>DOCUMENT
				2057	version=1.0
				2058	standalone=true
				2059	ELEMENT EXAMPLE
				2060	ATTRIBUTE prop1
				2061	TEXT
				2062	content=gnome is great
				2063	ATTRIBUTE prop2
				2064	ENTITY_REF
				2065	TEXT
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	2066	content= linux too
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2067	ELEMENT head
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2068	ELEMENT title
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2069	TEXT
				2070	content=Welcome to Gnome
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2071	ELEMENT chapter
				2072	ELEMENT title
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2073	TEXT
				2074	content=The Linux adventure
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2075	ELEMENT p
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2076	TEXT
				2077	content=bla bla bla ...
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	2078	ELEMENT image
				2079	ATTRIBUTE href
				2080	TEXT
				2081	content=linus.gif
				2082	ELEMENT p
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	2083	TEXT
				2084	content=...</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	2085
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2086	<p>This should be useful for learning the internal representation model.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	2087
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	2088	<h2><a name="interface">The SAX interface</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2089
Daniel Veillard	402e8c8	2000-02-29 22:57:47 +0000	[diff] [blame]	2090	<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]	2091	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]	2092	loaded using libxml), it's better to use the SAX interface of libxml. SAX is
				2093	a <strong>callback-based interface</strong> to the parser. Before parsing,
				2094	the application layer registers a customized set of callbacks which are
				2095	called by the library as it progresses through the XML input.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2096
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2097	<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]	2098	libxml, see the <a
				2099	href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
				2100	documentation</a>.written by <a href="mailto:james@daa.com.au">James
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2101	Henstridge</a>.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2102
				2103	<p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
				2104	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]	2105	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]	2106	distribution). Here is the sequence of callbacks that would be reported by
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	2107	testSAX when parsing the example XML document shown earlier:</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2108	<pre>SAX.setDocumentLocator()
				2109	SAX.startDocument()
				2110	SAX.getEntity(amp)
				2111	SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too')
				2112	SAX.characters( , 3)
				2113	SAX.startElement(head)
				2114	SAX.characters( , 4)
				2115	SAX.startElement(title)
				2116	SAX.characters(Welcome to Gnome, 16)
				2117	SAX.endElement(title)
				2118	SAX.characters( , 3)
				2119	SAX.endElement(head)
				2120	SAX.characters( , 3)
				2121	SAX.startElement(chapter)
				2122	SAX.characters( , 4)
				2123	SAX.startElement(title)
				2124	SAX.characters(The Linux adventure, 19)
				2125	SAX.endElement(title)
				2126	SAX.characters( , 4)
				2127	SAX.startElement(p)
				2128	SAX.characters(bla bla bla ..., 15)
				2129	SAX.endElement(p)
				2130	SAX.characters( , 4)
				2131	SAX.startElement(image, href='linus.gif')
				2132	SAX.endElement(image)
				2133	SAX.characters( , 4)
				2134	SAX.startElement(p)
				2135	SAX.characters(..., 3)
				2136	SAX.endElement(p)
				2137	SAX.characters( , 3)
				2138	SAX.endElement(chapter)
				2139	SAX.characters( , 1)
				2140	SAX.endElement(EXAMPLE)
				2141	SAX.endDocument()</pre>
				2142
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	2143	<p>Most of the other interfaces of libxml are based on the DOM tree-building
				2144	facility, so nearly everything up to the end of this document presupposes the
				2145	use of the standard DOM tree build. Note that the DOM tree itself is built by
				2146	a set of registered default callbacks, without internal specific
				2147	interface.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	2148
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2149	<h2><a name="Validation">Validation & DTDs</a></h2>
				2150
				2151	<p>Table of Content:</p>
				2152	<ol>
				2153	<li><a href="#General5">General overview</a></li>
				2154	<li><a href="#definition">The definition</a></li>
				2155	<li><a href="#Simple">Simple rules</a>
				2156	<ol>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	2157	<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]	2158	<li><a href="#Declaring">Declaring elements</a></li>
				2159	<li><a href="#Declaring1">Declaring attributes</a></li>
				2160	</ol>
				2161	</li>
				2162	<li><a href="#Some">Some examples</a></li>
				2163	<li><a href="#validate">How to validate</a></li>
				2164	<li><a href="#Other">Other resources</a></li>
				2165	</ol>
				2166
				2167	<h3><a name="General5">General overview</a></h3>
				2168
				2169	<p>Well what is validation and what is a DTD ?</p>
				2170
				2171	<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]	2172	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]	2173	specification, and allows one to describe and verify that a given document
				2174	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]	2175
				2176	<p>Validation is the process of checking a document against a DTD (more
				2177	generally against a set of construction rules).</p>
				2178
				2179	<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]	2180	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]	2181	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]	2182	(by defining the allowed content of an element; either text, a regular
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2183	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]	2184	and children). The DTD also defines the valid attributes for all elements and
				2185	the types of those attributes.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2186
				2187	<h3><a name="definition1">The definition</a></h3>
				2188
				2189	<p>The <a href="http://www.w3.org/TR/REC-xml">W3C XML Recommendation</a> (<a
				2190	href="http://www.xml.com/axml/axml.html">Tim Bray's annotated version of
				2191	Rev1</a>):</p>
				2192	<ul>
				2193	<li><a href="http://www.w3.org/TR/REC-xml#elemdecls">Declaring
				2194	elements</a></li>
				2195	<li><a href="http://www.w3.org/TR/REC-xml#attdecls">Declaring
				2196	attributes</a></li>
				2197	</ul>
				2198
				2199	<p>(unfortunately) all this is inherited from the SGML world, the syntax is
				2200	ancient...</p>
				2201
				2202	<h3><a name="Simple1">Simple rules</a></h3>
				2203
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2204	<p>Writing DTDs can be done in many ways. The rules to build them if you need
				2205	something permanent or something which can evolve over time can be radically
				2206	different. Really complex DTDs like DocBook ones are flexible but quite
				2207	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]	2208	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]	2209	usable for complex DTD design.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2210
				2211	<h4><a name="reference1">How to reference a DTD from a document</a>:</h4>
				2212
				2213	<p>Assuming the top element of the document is <code>spec</code> and the dtd
				2214	is placed in the file <code>mydtd</code> in the subdirectory
				2215	<code>dtds</code> of the directory from where the document were loaded:</p>
				2216
				2217	<p><code><!DOCTYPE spec SYSTEM "dtds/mydtd"></code></p>
				2218
				2219	<p>Notes:</p>
				2220	<ul>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2221	<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]	2222	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]	2223	full URL string indicating the location of your DTD on the Web. This is a
				2224	really good thing to do if you want others to validate your document.</li>
				2225	<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]	2226	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]	2227	without having to locate it on the web.</li>
				2228	<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]	2229	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]	2230	told to the parser/validator as the first element of the
				2231	<code>DOCTYPE</code> declaration.</li>
				2232	</ul>
				2233
				2234	<h4><a name="Declaring2">Declaring elements</a>:</h4>
				2235
				2236	<p>The following declares an element <code>spec</code>:</p>
				2237
				2238	<p><code><!ELEMENT spec (front, body, back?)></code></p>
				2239
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2240	<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]	2241	one <code>body</code> and one optional <code>back</code> children elements in
				2242	this order. The declaration of one element of the structure and its content
				2243	are done in a single declaration. Similarly the following declares
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2244	<code>div1</code> elements:</p>
				2245
Daniel Veillard	5173727	2002-01-23 23:10:38 +0000	[diff] [blame]	2246	<p><code><!ELEMENT div1 (head, (p \| list \| note)*, div2?)></code></p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2247
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2248	<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]	2249	<code>p</code>, <code>list</code>s and <code>note</code>s and then an
				2250	optional <code>div2</code>. And last but not least an element can contain
				2251	text:</p>
				2252
				2253	<p><code><!ELEMENT b (#PCDATA)></code></p>
				2254
				2255	<p><code>b</code> contains text or being of mixed content (text and elements
				2256	in no particular order):</p>
				2257
				2258	<p><code><!ELEMENT p (#PCDATA\|a\|ul\|b\|i\|em)*></code></p>
				2259
				2260	<p><code>p </code>can contain text or <code>a</code>, <code>ul</code>,
				2261	<code>b</code>, <code>i </code>or <code>em</code> elements in no particular
				2262	order.</p>
				2263
				2264	<h4><a name="Declaring1">Declaring attributes</a>:</h4>
				2265
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2266	<p>Again the attributes declaration includes their content definition:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2267
				2268	<p><code><!ATTLIST termdef name CDATA #IMPLIED></code></p>
				2269
				2270	<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]	2271	attribute containing text (<code>CDATA</code>) and which is optional
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2272	(<code>#IMPLIED</code>). The attribute value can also be defined within a
				2273	set:</p>
				2274
				2275	<p><code><!ATTLIST list type (bullets\|ordered\|glossary)
				2276	"ordered"></code></p>
				2277
				2278	<p>means <code>list</code> element have a <code>type</code> attribute with 3
				2279	allowed values "bullets", "ordered" or "glossary" and which default to
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2280	"ordered" if the attribute is not explicitly specified.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2281
				2282	<p>The content type of an attribute can be text (<code>CDATA</code>),
				2283	anchor/reference/references
				2284	(<code>ID</code>/<code>IDREF</code>/<code>IDREFS</code>), entity(ies)
				2285	(<code>ENTITY</code>/<code>ENTITIES</code>) or name(s)
				2286	(<code>NMTOKEN</code>/<code>NMTOKENS</code>). The following defines that a
				2287	<code>chapter</code> element can have an optional <code>id</code> attribute
				2288	of type <code>ID</code>, usable for reference from attribute of type
				2289	IDREF:</p>
				2290
				2291	<p><code><!ATTLIST chapter id ID #IMPLIED></code></p>
				2292
				2293	<p>The last value of an attribute definition can be <code>#REQUIRED
				2294	</code>meaning that the attribute has to be given, <code>#IMPLIED</code>
				2295	meaning that it is optional, or the default value (possibly prefixed by
				2296	<code>#FIXED</code> if it is the only allowed).</p>
				2297
				2298	<p>Notes:</p>
				2299	<ul>
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2300	<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]	2301	single expression, but it is just a convention adopted by a lot of DTD
				2302	writers:
				2303	<pre><!ATTLIST termdef
				2304	id ID #REQUIRED
				2305	name CDATA #IMPLIED></pre>
				2306	<p>The previous construct defines both <code>id</code> and
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2307	<code>name</code> attributes for the element <code>termdef</code>.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2308	</li>
				2309	</ul>
				2310
				2311	<h3><a name="Some1">Some examples</a></h3>
				2312
				2313	<p>The directory <code>test/valid/dtds/</code> in the libxml distribution
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2314	contains some complex DTD examples. The example in the file
				2315	<code>test/valid/dia.xml</code> shows an XML file where the simple DTD is
				2316	directly included within the document.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2317
				2318	<h3><a name="validate1">How to validate</a></h3>
				2319
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2320	<p>The simplest way is to use the xmllint program included with libxml. The
				2321	<code>--valid</code> option turns-on validation of the files given as input.
				2322	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]	2323	1.0 specification:</p>
				2324
				2325	<p><code>xmllint --valid --noout test/valid/REC-xml-19980210.xml</code></p>
				2326
Daniel Veillard	0b28e88	2002-07-24 23:47:05 +0000	[diff] [blame]	2327	<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]	2328
Daniel Veillard	42766c0	2002-08-22 20:52:17 +0000	[diff] [blame]	2329	<p>The <code>--dtdvalid dtd</code> allows validation of the document(s)
				2330	against a given DTD.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2331
				2332	<p>Libxml exports an API to handle DTDs and validation, check the <a
				2333	href="http://xmlsoft.org/html/libxml-valid.html">associated
				2334	description</a>.</p>
				2335
				2336	<h3><a name="Other1">Other resources</a></h3>
				2337
				2338	<p>DTDs are as old as SGML. So there may be a number of examples on-line, I
				2339	will just list one for now, others pointers welcome:</p>
				2340	<ul>
				2341	<li><a href="http://www.xml101.com:8081/dtd/">XML-101 DTD</a></li>
				2342	</ul>
				2343
				2344	<p>I suggest looking at the examples found under test/valid/dtd and any of
				2345	the large number of books available on XML. The dia example in test/valid
				2346	should be both simple and complete enough to allow you to build your own.</p>
				2347
				2348	<p></p>
				2349
				2350	<h2><a name="Memory">Memory Management</a></h2>
				2351
				2352	<p>Table of Content:</p>
				2353	<ol>
				2354	<li><a href="#General3">General overview</a></li>
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	2355	<li><a href="#setting">Setting libxml set of memory routines</a></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2356	<li><a href="#cleanup">Cleaning up after parsing</a></li>
				2357	<li><a href="#Debugging">Debugging routines</a></li>
				2358	<li><a href="#General4">General memory requirements</a></li>
				2359	</ol>
				2360
				2361	<h3><a name="General3">General overview</a></h3>
				2362
				2363	<p>The module <code><a
				2364	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlmemory.h</a></code>
				2365	provides the interfaces to the libxml memory system:</p>
				2366	<ul>
				2367	<li>libxml does not use the libc memory allocator directly but xmlFree(),
				2368	xmlMalloc() and xmlRealloc()</li>
				2369	<li>those routines can be reallocated to a specific set of routine, by
				2370	default the libc ones i.e. free(), malloc() and realloc()</li>
				2371	<li>the xmlmemory.c module includes a set of debugging routine</li>
				2372	</ul>
				2373
				2374	<h3><a name="setting">Setting libxml set of memory routines</a></h3>
				2375
				2376	<p>It is sometimes useful to not use the default memory allocator, either for
				2377	debugging, analysis or to implement a specific behaviour on memory management
				2378	(like on embedded systems). Two function calls are available to do so:</p>
				2379	<ul>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2380	<li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemGet
				2381	()</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]	2382	<li><a
				2383	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemSetup()</a>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2384	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]	2385	</ul>
				2386
				2387	<p>Of course a call to xmlMemSetup() should probably be done before calling
				2388	any other libxml routines (unless you are sure your allocations routines are
				2389	compatibles).</p>
				2390
				2391	<h3><a name="cleanup">Cleaning up after parsing</a></h3>
				2392
				2393	<p>Libxml is not stateless, there is a few set of memory structures needing
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2394	allocation before the parser is fully functional (some encoding structures
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2395	for example). This also mean that once parsing is finished there is a tiny
				2396	amount of memory (a few hundred bytes) which can be recollected if you don't
				2397	reuse the parser immediately:</p>
				2398	<ul>
				2399	<li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlCleanupParser
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2400	()</a> is a centralized routine to free the parsing states. Note that it
				2401	won't deallocate any produced tree if any (use the xmlFreeDoc() and
				2402	related routines for this).</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2403	<li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlInitParser
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2404	()</a> is the dual routine allowing to preallocate the parsing state
				2405	which can be useful for example to avoid initialization reentrancy
				2406	problems when using libxml in multithreaded applications</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2407	</ul>
				2408
				2409	<p>Generally xmlCleanupParser() is safe, if needed the state will be rebuild
				2410	at the next invocation of parser routines, but be careful of the consequences
				2411	in multithreaded applications.</p>
				2412
				2413	<h3><a name="Debugging">Debugging routines</a></h3>
				2414
				2415	<p>When configured using --with-mem-debug flag (off by default), libxml uses
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2416	a set of memory allocation debugging routines keeping track of all allocated
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2417	blocks and the location in the code where the routine was called. A couple of
				2418	other debugging routines allow to dump the memory allocated infos to a file
				2419	or call a specific routine when a given block number is allocated:</p>
				2420	<ul>
				2421	<li><a
				2422	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMallocLoc()</a>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2423	<a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2424	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlReallocLoc()</a>
				2425	and <a
				2426	href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemStrdupLoc()</a>
				2427	are the memory debugging replacement allocation routines</li>
				2428	<li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemoryDump
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	2429	()</a> dumps all the informations about the allocated memory block lefts
				2430	in the <code>.memdump</code> file</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2431	</ul>
				2432
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2433	<p>When developing libxml memory debug is enabled, the tests programs call
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2434	xmlMemoryDump () and the "make test" regression tests will check for any
				2435	memory leak during the full regression test sequence, this helps a lot
				2436	ensuring that libxml does not leak memory and bullet proof memory
				2437	allocations use (some libc implementations are known to be far too permissive
				2438	resulting in major portability problems!).</p>
				2439
				2440	<p>If the .memdump reports a leak, it displays the allocation function and
				2441	also tries to give some informations about the content and structure of the
				2442	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]	2443	but not always. Assuming the allocation problem is reproducible, it is
				2444	possible to find more easily:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2445	<ol>
				2446	<li>write down the block number xxxx not allocated</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2447	<li>export the environment variable XML_MEM_BREAKPOINT=xxxx , the easiest
Daniel Veillard	7579482	2002-04-11 16:24:32 +0000	[diff] [blame]	2448	when using GDB is to simply give the command
				2449	<p><code>set environment XML_MEM_BREAKPOINT xxxx</code></p>
				2450	<p>before running the program.</p>
				2451	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2452	<li>run the program under a debugger and set a breakpoint on
				2453	xmlMallocBreakpoint() a specific function called when this precise block
				2454	is allocated</li>
				2455	<li>when the breakpoint is reached you can then do a fine analysis of the
				2456	allocation an step to see the condition resulting in the missing
				2457	deallocation.</li>
				2458	</ol>
				2459
				2460	<p>I used to use a commercial tool to debug libxml memory problems but after
				2461	noticing that it was not detecting memory leaks that simple mechanism was
Daniel Veillard	7579482	2002-04-11 16:24:32 +0000	[diff] [blame]	2462	used and proved extremely efficient until now. Lately I have also used <a
				2463	href="http://developer.kde.org/~sewardj/">valgrind</a> with quite some
				2464	success, it is tied to the i386 architecture since it works by emulating the
				2465	processor and instruction set, it is slow but extremely efficient, i.e. it
				2466	spot memory usage errors in a very precise way.</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2467
				2468	<h3><a name="General4">General memory requirements</a></h3>
				2469
				2470	<p>How much libxml memory require ? It's hard to tell in average it depends
				2471	of a number of things:</p>
				2472	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2473	<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]	2474	information maintained about the stacks of names and entities locations.
				2475	The I/O and encoding handlers will probably account for a few KBytes.
				2476	This is true for both the XML and HTML parser (though the HTML parser
				2477	need more state).</li>
				2478	<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]	2479	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]	2480	textual document the internal memory requirement is about 4 times the
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2481	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]	2482	recommendation is a bit more of 150KBytes and takes 650KBytes of main
				2483	memory when parsed). Validation will add a amount of memory required for
				2484	maintaining the external Dtd state which should be linear with the
				2485	complexity of the content model defined by the Dtd</li>
Daniel Veillard	ce192eb	2003-04-16 15:58:05 +0000	[diff] [blame]	2486	<li>If you need to work with fixed memory requirements or don't need the
				2487	full DOM tree then using the <a href="xmlreader.html">xmlReader
				2488	interface</a> is probably the best way to proceed, it still allows to
				2489	validate or operate on subset of the tree if needed.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2490	<li>If you don't care about the advanced features of libxml like
Daniel Veillard	ce192eb	2003-04-16 15:58:05 +0000	[diff] [blame]	2491	validation, DOM, XPath or XPointer, don't use entities, need to work with
				2492	fixed memory requirements, and try to get the fastest parsing possible
				2493	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]	2494	</ul>
				2495
				2496	<p></p>
				2497
				2498	<h2><a name="Encodings">Encodings support</a></h2>
				2499
				2500	<p>Table of Content:</p>
				2501	<ol>
				2502	<li><a href="encoding.html#What">What does internationalization support
				2503	mean ?</a></li>
				2504	<li><a href="encoding.html#internal">The internal encoding, how and
				2505	why</a></li>
				2506	<li><a href="encoding.html#implemente">How is it implemented ?</a></li>
				2507	<li><a href="encoding.html#Default">Default supported encodings</a></li>
				2508	<li><a href="encoding.html#extend">How to extend the existing
				2509	support</a></li>
				2510	</ol>
				2511
				2512	<h3><a name="What">What does internationalization support mean ?</a></h3>
				2513
Daniel Veillard	238836e	2003-04-07 22:57:29 +0000	[diff] [blame]	2514	<p>If you are not really familiar with Internationalization (usual shorcut is
				2515	I18N) , Unicode, characters and glyphs, I suggest you read a <a
				2516	href="http://www.tbray.org/ongoing/When/200x/2003/04/06/Unicode">presentation</a>
				2517	by Tim Bray on Unicode and why you should care about it.</p>
				2518
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2519	<p>XML was designed from the start to allow the support of any character set
				2520	by using Unicode. Any conformant XML parser has to support the UTF-8 and
				2521	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]	2522	is a variable length encoding whose greatest points are to reuse the same
				2523	encoding for ASCII and to save space for Western encodings, but it is a bit
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2524	more complex to handle in practice. UTF-16 use 2 bytes per characters (and
				2525	sometimes combines two pairs), it makes implementation easier, but looks a
				2526	bit overkill for Western languages encoding. Moreover the XML specification
				2527	allows document to be encoded in other encodings at the condition that they
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2528	are clearly labeled as such. For example the following is a wellformed XML
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2529	document encoded in ISO-8859 1 and using accentuated letter that we French
				2530	likes for both markup and content:</p>
				2531	<pre><?xml version="1.0" encoding="ISO-8859-1"?>
				2532	<très>là</très></pre>
				2533
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2534	<p>Having internationalization support in libxml means the following:</p>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2535	<ul>
				2536	<li>the document is properly parsed</li>
				2537	<li>informations about it's encoding are saved</li>
				2538	<li>it can be modified</li>
				2539	<li>it can be saved in its original encoding</li>
				2540	<li>it can also be saved in another encoding supported by libxml (for
				2541	example straight UTF8 or even an ASCII form)</li>
				2542	</ul>
				2543
				2544	<p>Another very important point is that the whole libxml API, with the
				2545	exception of a few routines to read with a specific encoding or save to a
				2546	specific encoding, is completely agnostic about the original encoding of the
				2547	document.</p>
				2548
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2549	<p>It should be noted too that the HTML parser embedded in libxml now obey
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2550	the same rules too, the following document will be (as of 2.2.2) handled in
				2551	an internationalized fashion by libxml too:</p>
				2552	<pre><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
				2553	"http://www.w3.org/TR/REC-html40/loose.dtd">
				2554	<html lang="fr">
				2555	<head>
				2556	<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
				2557	</head>
				2558	<body>
				2559	<p>W3C crée des standards pour le Web.</body>
				2560	</html></pre>
				2561
				2562	<h3><a name="internal">The internal encoding, how and why</a></h3>
				2563
				2564	<p>One of the core decision was to force all documents to be converted to a
				2565	default internal encoding, and that encoding to be UTF-8, here are the
				2566	rationale for those choices:</p>
				2567	<ul>
				2568	<li>keeping the native encoding in the internal form would force the libxml
				2569	users (or the code associated) to be fully aware of the encoding of the
				2570	original document, for examples when adding a text node to a document,
				2571	the content would have to be provided in the document encoding, i.e. the
				2572	client code would have to check it before hand, make sure it's conformant
				2573	to the encoding, etc ... Very hard in practice, though in some specific
				2574	cases this may make sense.</li>
				2575	<li>the second decision was which encoding. From the XML spec only UTF8 and
				2576	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]	2577	is mandatory support. UCS-4 (32 bits fixed size encoding) could be
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2578	considered an intelligent choice too since it's a direct Unicode mapping
				2579	support. I selected UTF-8 on the basis of efficiency and compatibility
				2580	with surrounding software:
				2581	<ul>
				2582	<li>UTF-8 while a bit more complex to convert from/to (i.e. slightly
				2583	more costly to import and export CPU wise) is also far more compact
				2584	than UTF-16 (and UCS-4) for a majority of the documents I see it used
				2585	for right now (RPM RDF catalogs, advogato data, various configuration
				2586	file formats, etc.) and the key point for today's computer
				2587	architecture is efficient uses of caches. If one nearly double the
				2588	memory requirement to store the same amount of data, this will trash
				2589	caches (main memory/external caches/internal caches) and my take is
				2590	that this harms the system far more than the CPU requirements needed
				2591	for the conversion to UTF-8</li>
				2592	<li>Most of libxml version 1 users were using it with straight ASCII
				2593	most of the time, doing the conversion with an internal encoding
				2594	requiring all their code to be rewritten was a serious show-stopper
				2595	for using UTF-16 or UCS-4.</li>
				2596	<li>UTF-8 is being used as the de-facto internal encoding standard for
				2597	related code like the <a href="http://www.pango.org/">pango</a>
				2598	upcoming Gnome text widget, and a lot of Unix code (yep another place
				2599	where Unix programmer base takes a different approach from Microsoft
				2600	- they are using UTF-16)</li>
				2601	</ul>
				2602	</li>
				2603	</ul>
				2604
				2605	<p>What does this mean in practice for the libxml user:</p>
				2606	<ul>
				2607	<li>xmlChar, the libxml data type is a byte, those bytes must be assembled
				2608	as UTF-8 valid strings. The proper way to terminate an xmlChar * string
				2609	is simply to append 0 byte, as usual.</li>
				2610	<li>One just need to make sure that when using chars outside the ASCII set,
				2611	the values has been properly converted to UTF-8</li>
				2612	</ul>
				2613
				2614	<h3><a name="implemente">How is it implemented ?</a></h3>
				2615
				2616	<p>Let's describe how all this works within libxml, basically the I18N
				2617	(internationalization) support get triggered only during I/O operation, i.e.
				2618	when reading a document or saving one. Let's look first at the reading
				2619	sequence:</p>
				2620	<ol>
				2621	<li>when a document is processed, we usually don't know the encoding, a
				2622	simple heuristic allows to detect UTF-18 and UCS-4 from whose where the
				2623	ASCII range (0-0x7F) maps with ASCII</li>
				2624	<li>the xml declaration if available is parsed, including the encoding
				2625	declaration. At that point, if the autodetected encoding is different
				2626	from the one declared a call to xmlSwitchEncoding() is issued.</li>
				2627	<li>If there is no encoding declaration, then the input has to be in either
				2628	UTF-8 or UTF-16, if it is not then at some point when processing the
				2629	input, the converter/checker of UTF-8 form will raise an encoding error.
				2630	You may end-up with a garbled document, or no document at all ! Example:
				2631	<pre>~/XML -> ./xmllint err.xml
				2632	err.xml:1: error: Input is not proper UTF-8, indicate encoding !
				2633	<très>là</très>
				2634	^
				2635	err.xml:1: error: Bytes: 0xE8 0x73 0x3E 0x6C
				2636	<très>là</très>
				2637	^</pre>
				2638	</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2639	<li>xmlSwitchEncoding() does an encoding name lookup, canonicalize it, and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2640	then search the default registered encoding converters for that encoding.
				2641	If it's not within the default set and iconv() support has been compiled
				2642	it, it will ask iconv for such an encoder. If this fails then the parser
				2643	will report an error and stops processing:
				2644	<pre>~/XML -> ./xmllint err2.xml
				2645	err2.xml:1: error: Unsupported encoding UnsupportedEnc
				2646	<?xml version="1.0" encoding="UnsupportedEnc"?>
				2647	^</pre>
				2648	</li>
Daniel Veillard	46c5c1d	2002-05-20 07:15:54 +0000	[diff] [blame]	2649	<li>From that point the encoder processes progressively the input (it is
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2650	plugged as a front-end to the I/O module) for that entity. It captures
				2651	and convert on-the-fly the document to be parsed to UTF-8. The parser
				2652	itself just does UTF-8 checking of this input and process it
				2653	transparently. The only difference is that the encoding information has
				2654	been added to the parsing context (more precisely to the input
				2655	corresponding to this entity).</li>
				2656	<li>The result (when using DOM) is an internal form completely in UTF-8
				2657	with just an encoding information on the document node.</li>
				2658	</ol>
				2659
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2660	<p>Ok then what happens when saving the document (assuming you
				2661	collected/built an xmlDoc DOM like structure) ? It depends on the function
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2662	called, xmlSaveFile() will just try to save in the original encoding, while
				2663	xmlSaveFileTo() and xmlSaveFileEnc() can optionally save to a given
				2664	encoding:</p>
				2665	<ol>
				2666	<li>if no encoding is given, libxml will look for an encoding value
				2667	associated to the document and if it exists will try to save to that
				2668	encoding,
				2669	<p>otherwise everything is written in the internal form, i.e. UTF-8</p>
				2670	</li>
				2671	<li>so if an encoding was specified, either at the API level or on the
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2672	document, libxml will again canonicalize the encoding name, lookup for a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2673	converter in the registered set or through iconv. If not found the
				2674	function will return an error code</li>
				2675	<li>the converter is placed before the I/O buffer layer, as another kind of
				2676	buffer, then libxml will simply push the UTF-8 serialization to through
				2677	that buffer, which will then progressively be converted and pushed onto
				2678	the I/O layer.</li>
				2679	<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]	2680	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]	2681	ISO-8859-1 converter won't work. Since the encoders are progressive they
				2682	will just report the error and the number of bytes converted, at that
				2683	point libxml will decode the offending character, remove it from the
				2684	buffer and replace it with the associated charRef encoding &#123; and
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2685	resume the conversion. This guarantees that any document will be saved
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2686	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]	2687	a problem in the current version, in practice avoid using non-ascii
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2688	characters for tags or attributes names @@). A special "ascii" encoding
				2689	name is used to save documents to a pure ascii form can be used when
				2690	portability is really crucial</li>
				2691	</ol>
				2692
				2693	<p>Here is a few examples based on the same test document:</p>
				2694	<pre>~/XML -> ./xmllint isolat1
				2695	<?xml version="1.0" encoding="ISO-8859-1"?>
				2696	<très>là</très>
				2697	~/XML -> ./xmllint --encode UTF-8 isolat1
				2698	<?xml version="1.0" encoding="UTF-8"?>
				2699	<trÃ¨s>lÃ </trÃ¨s>
				2700	~/XML -> </pre>
				2701
				2702	<p>The same processing is applied (and reuse most of the code) for HTML I18N
				2703	processing. Looking up and modifying the content encoding is a bit more
				2704	difficult since it is located in a <meta> tag under the <head>,
				2705	so a couple of functions htmlGetMetaEncoding() and htmlSetMetaEncoding() have
				2706	been provided. The parser also attempts to switch encoding on the fly when
				2707	detecting such a tag on input. Except for that the processing is the same
				2708	(and again reuses the same code).</p>
				2709
				2710	<h3><a name="Default">Default supported encodings</a></h3>
				2711
				2712	<p>libxml has a set of default converters for the following encodings
				2713	(located in encoding.c):</p>
				2714	<ol>
				2715	<li>UTF-8 is supported by default (null handlers)</li>
				2716	<li>UTF-16, both little and big endian</li>
				2717	<li>ISO-Latin-1 (ISO-8859-1) covering most western languages</li>
				2718	<li>ASCII, useful mostly for saving</li>
				2719	<li>HTML, a specific handler for the conversion of UTF-8 to ASCII with HTML
				2720	predefined entities like &copy; for the Copyright sign.</li>
				2721	</ol>
				2722
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2723	<p>More over when compiled on an Unix platform with iconv support the full
				2724	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]	2725	linux machine with glibc-2.1 the list of supported encodings and aliases fill
				2726	3 full pages, and include UCS-4, the full set of ISO-Latin encodings, and the
				2727	various Japanese ones.</p>
				2728
				2729	<h4>Encoding aliases</h4>
				2730
				2731	<p>From 2.2.3, libxml has support to register encoding names aliases. The
				2732	goal is to be able to parse document whose encoding is supported but where
				2733	the name differs (for example from the default set of names accepted by
				2734	iconv). The following functions allow to register and handle new aliases for
				2735	existing encodings. Once registered libxml will automatically lookup the
				2736	aliases when handling a document:</p>
				2737	<ul>
				2738	<li>int xmlAddEncodingAlias(const char name, const char alias);</li>
				2739	<li>int xmlDelEncodingAlias(const char *alias);</li>
				2740	<li>const char * xmlGetEncodingAlias(const char *alias);</li>
				2741	<li>void xmlCleanupEncodingAliases(void);</li>
				2742	</ul>
				2743
				2744	<h3><a name="extend">How to extend the existing support</a></h3>
				2745
				2746	<p>Well adding support for new encoding, or overriding one of the encoders
				2747	(assuming it is buggy) should not be hard, just write an input and output
				2748	conversion routines to/from UTF-8, and register them using
				2749	xmlNewCharEncodingHandler(name, xxxToUTF8, UTF8Toxxx), and they will be
				2750	called automatically if the parser(s) encounter such an encoding name
				2751	(register it uppercase, this will help). The description of the encoders,
				2752	their arguments and expected return values are described in the encoding.h
				2753	header.</p>
				2754
				2755	<p>A quick note on the topic of subverting the parser to use a different
				2756	internal encoding than UTF-8, in some case people will absolutely want to
				2757	keep the internal encoding different, I think it's still possible (but the
				2758	encoding must be compliant with ASCII on the same subrange) though I didn't
				2759	tried it. The key is to override the default conversion routines (by
				2760	registering null encoders/decoders for your charsets), and bypass the UTF-8
				2761	checking of the parser by setting the parser context charset
				2762	(ctxt->charset) to something different than XML_CHAR_ENCODING_UTF8, but
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2763	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]	2764	saving back.</p>
				2765
				2766	<p>Basically proper I18N support is important, this requires at least
				2767	libxml-2.0.0, but a lot of features and corrections are really available only
				2768	starting 2.2.</p>
				2769
				2770	<h2><a name="IO">I/O Interfaces</a></h2>
				2771
				2772	<p>Table of Content:</p>
				2773	<ol>
				2774	<li><a href="#General1">General overview</a></li>
				2775	<li><a href="#basic">The basic buffer type</a></li>
				2776	<li><a href="#Input">Input I/O handlers</a></li>
				2777	<li><a href="#Output">Output I/O handlers</a></li>
				2778	<li><a href="#entities">The entities loader</a></li>
				2779	<li><a href="#Example2">Example of customized I/O</a></li>
				2780	</ol>
				2781
				2782	<h3><a name="General1">General overview</a></h3>
				2783
				2784	<p>The module <code><a
				2785	href="http://xmlsoft.org/html/libxml-xmlio.html">xmlIO.h</a></code> provides
				2786	the interfaces to the libxml I/O system. This consists of 4 main parts:</p>
				2787	<ul>
				2788	<li>Entities loader, this is a routine which tries to fetch the entities
				2789	(files) based on their PUBLIC and SYSTEM identifiers. The default loader
				2790	don't look at the public identifier since libxml do not maintain a
				2791	catalog. You can redefine you own entity loader by using
				2792	<code>xmlGetExternalEntityLoader()</code> and
Daniel Veillard	9c46682	2001-10-25 12:03:39 +0000	[diff] [blame]	2793	<code>xmlSetExternalEntityLoader()</code>. <a href="#entities">Check the
				2794	example</a>.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2795	<li>Input I/O buffers which are a commodity structure used by the parser(s)
				2796	input layer to handle fetching the informations to feed the parser. This
				2797	provides buffering and is also a placeholder where the encoding
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	2798	converters to UTF8 are piggy-backed.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2799	<li>Output I/O buffers are similar to the Input ones and fulfill similar
				2800	task but when generating a serialization from a tree.</li>
				2801	<li>A mechanism to register sets of I/O callbacks and associate them with
				2802	specific naming schemes like the protocol part of the URIs.
				2803	<p>This affect the default I/O operations and allows to use specific I/O
				2804	handlers for certain names.</p>
				2805	</li>
				2806	</ul>
				2807
				2808	<p>The general mechanism used when loading http://rpmfind.net/xml.html for
				2809	example in the HTML parser is the following:</p>
				2810	<ol>
				2811	<li>The default entity loader calls <code>xmlNewInputFromFile()</code> with
				2812	the parsing context and the URI string.</li>
				2813	<li>the URI string is checked against the existing registered handlers
				2814	using their match() callback function, if the HTTP module was compiled
				2815	in, it is registered and its match() function will succeeds</li>
				2816	<li>the open() function of the handler is called and if successful will
				2817	return an I/O Input buffer</li>
				2818	<li>the parser will the start reading from this buffer and progressively
				2819	fetch information from the resource, calling the read() function of the
				2820	handler until the resource is exhausted</li>
				2821	<li>if an encoding change is detected it will be installed on the input
				2822	buffer, providing buffering and efficient use of the conversion
				2823	routines</li>
				2824	<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]	2825	called once and the Input buffer and associated resources are
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2826	deallocated.</li>
				2827	</ol>
				2828
				2829	<p>The user defined callbacks are checked first to allow overriding of the
				2830	default libxml I/O routines.</p>
				2831
				2832	<h3><a name="basic">The basic buffer type</a></h3>
				2833
				2834	<p>All the buffer manipulation handling is done using the
				2835	<code>xmlBuffer</code> type define in <code><a
				2836	href="http://xmlsoft.org/html/libxml-tree.html">tree.h</a> </code>which is a
				2837	resizable memory buffer. The buffer allocation strategy can be selected to be
				2838	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]	2839	trade-off). The values are <code>XML_BUFFER_ALLOC_EXACT</code> and
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2840	<code>XML_BUFFER_ALLOC_DOUBLEIT</code>, and can be set individually or on a
				2841	system wide basis using <code>xmlBufferSetAllocationScheme()</code>. A number
				2842	of functions allows to manipulate buffers with names starting with the
				2843	<code>xmlBuffer...</code> prefix.</p>
				2844
				2845	<h3><a name="Input">Input I/O handlers</a></h3>
				2846
				2847	<p>An Input I/O handler is a simple structure
				2848	<code>xmlParserInputBuffer</code> containing a context associated to the
				2849	resource (file descriptor, or pointer to a protocol handler), the read() and
				2850	close() callbacks to use and an xmlBuffer. And extra xmlBuffer and a charset
				2851	encoding handler are also present to support charset conversion when
				2852	needed.</p>
				2853
				2854	<h3><a name="Output">Output I/O handlers</a></h3>
				2855
				2856	<p>An Output handler <code>xmlOutputBuffer</code> is completely similar to an
				2857	Input one except the callbacks are write() and close().</p>
				2858
				2859	<h3><a name="entities">The entities loader</a></h3>
				2860
				2861	<p>The entity loader resolves requests for new entities and create inputs for
				2862	the parser. Creating an input from a filename or an URI string is done
				2863	through the xmlNewInputFromFile() routine. The default entity loader do not
				2864	handle the PUBLIC identifier associated with an entity (if any). So it just
				2865	calls xmlNewInputFromFile() with the SYSTEM identifier (which is mandatory in
				2866	XML).</p>
				2867
				2868	<p>If you want to hook up a catalog mechanism then you simply need to
				2869	override the default entity loader, here is an example:</p>
				2870	<pre>#include <libxml/xmlIO.h>
				2871
				2872	xmlExternalEntityLoader defaultLoader = NULL;
				2873
				2874	xmlParserInputPtr
				2875	xmlMyExternalEntityLoader(const char URL, const char ID,
				2876	xmlParserCtxtPtr ctxt) {
				2877	xmlParserInputPtr ret;
				2878	const char *fileID = NULL;
				2879	/* lookup for the fileID depending on ID */
				2880
				2881	ret = xmlNewInputFromFile(ctxt, fileID);
				2882	if (ret != NULL)
				2883	return(ret);
				2884	if (defaultLoader != NULL)
				2885	ret = defaultLoader(URL, ID, ctxt);
				2886	return(ret);
				2887	}
				2888
				2889	int main(..) {
				2890	...
				2891
				2892	/*
				2893	* Install our own entity loader
				2894	*/
				2895	defaultLoader = xmlGetExternalEntityLoader();
				2896	xmlSetExternalEntityLoader(xmlMyExternalEntityLoader);
				2897
				2898	...
				2899	}</pre>
				2900
				2901	<h3><a name="Example2">Example of customized I/O</a></h3>
				2902
				2903	<p>This example come from <a href="http://xmlsoft.org/messages/0708.html">a
				2904	real use case</a>, xmlDocDump() closes the FILE * passed by the application
				2905	and this was a problem. The <a
				2906	href="http://xmlsoft.org/messages/0711.html">solution</a> was to redefine a
				2907	new output handler with the closing call deactivated:</p>
				2908	<ol>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	2909	<li>First define a new I/O output allocator where the output don't close
				2910	the file:
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2911	<pre>xmlOutputBufferPtr
				2912	xmlOutputBufferCreateOwn(FILE *file, xmlCharEncodingHandlerPtr encoder) {
				2913	xmlOutputBufferPtr ret;
				2914
				2915	if (xmlOutputCallbackInitialized == 0)
				2916	xmlRegisterDefaultOutputCallbacks();
				2917
				2918	if (file == NULL) return(NULL);
				2919	ret = xmlAllocOutputBuffer(encoder);
				2920	if (ret != NULL) {
				2921	ret->context = file;
				2922	ret->writecallback = xmlFileWrite;
				2923	ret->closecallback = NULL; /* No close callback */
				2924	}
Daniel Veillard	f83a2c7	2003-04-08 13:48:40 +0000	[diff] [blame]	2925	return(ret);
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	2926	} </pre>
				2927	</li>
				2928	<li>And then use it to save the document:
				2929	<pre>FILE *f;
				2930	xmlOutputBufferPtr output;
				2931	xmlDocPtr doc;
				2932	int res;
				2933
				2934	f = ...
				2935	doc = ....
				2936
				2937	output = xmlOutputBufferCreateOwn(f, NULL);
				2938	res = xmlSaveFileTo(output, doc, NULL);
				2939	</pre>
				2940	</li>
				2941	</ol>
				2942
				2943	<h2><a name="Catalog">Catalog support</a></h2>
				2944
				2945	<p>Table of Content:</p>
				2946	<ol>
				2947	<li><a href="General2">General overview</a></li>
				2948	<li><a href="#definition">The definition</a></li>
				2949	<li><a href="#Simple">Using catalogs</a></li>
				2950	<li><a href="#Some">Some examples</a></li>
				2951	<li><a href="#reference">How to tune catalog usage</a></li>
				2952	<li><a href="#validate">How to debug catalog processing</a></li>
				2953	<li><a href="#Declaring">How to create and maintain catalogs</a></li>
				2954	<li><a href="#implemento">The implementor corner quick review of the
				2955	API</a></li>
				2956	<li><a href="#Other">Other resources</a></li>
				2957	</ol>
				2958
				2959	<h3><a name="General2">General overview</a></h3>
				2960
				2961	<p>What is a catalog? Basically it's a lookup mechanism used when an entity
				2962	(a file or a remote resource) references another entity. The catalog lookup
				2963	is inserted between the moment the reference is recognized by the software
				2964	(XML parser, stylesheet processing, or even images referenced for inclusion
				2965	in a rendering) and the time where loading that resource is actually
				2966	started.</p>
				2967
				2968	<p>It is basically used for 3 things:</p>
				2969	<ul>
				2970	<li>mapping from "logical" names, the public identifiers and a more
				2971	concrete name usable for download (and URI). For example it can associate
				2972	the logical name
				2973	<p>"-//OASIS//DTD DocBook XML V4.1.2//EN"</p>
				2974	<p>of the DocBook 4.1.2 XML DTD with the actual URL where it can be
				2975	downloaded</p>
				2976	<p>http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd</p>
				2977	</li>
				2978	<li>remapping from a given URL to another one, like an HTTP indirection
				2979	saying that
				2980	<p>"http://www.oasis-open.org/committes/tr.xsl"</p>
				2981	<p>should really be looked at</p>
				2982	<p>"http://www.oasis-open.org/committes/entity/stylesheets/base/tr.xsl"</p>
				2983	</li>
				2984	<li>providing a local cache mechanism allowing to load the entities
				2985	associated to public identifiers or remote resources, this is a really
				2986	important feature for any significant deployment of XML or SGML since it
				2987	allows to avoid the aleas and delays associated to fetching remote
				2988	resources.</li>
				2989	</ul>
				2990
				2991	<h3><a name="definition">The definitions</a></h3>
				2992
				2993	<p>Libxml, as of 2.4.3 implements 2 kind of catalogs:</p>
				2994	<ul>
				2995	<li>the older SGML catalogs, the official spec is SGML Open Technical
				2996	Resolution TR9401:1997, but is better understood by reading <a
				2997	href="http://www.jclark.com/sp/catalog.htm">the SP Catalog page</a> from
				2998	James Clark. This is relatively old and not the preferred mode of
				2999	operation of libxml.</li>
				3000	<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]	3001	Catalogs</a> is far more flexible, more recent, uses an XML syntax and
				3002	should scale quite better. This is the default option of libxml.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3003	</ul>
				3004
				3005	<p></p>
				3006
				3007	<h3><a name="Simple">Using catalog</a></h3>
				3008
				3009	<p>In a normal environment libxml will by default check the presence of a
				3010	catalog in /etc/xml/catalog, and assuming it has been correctly populated,
				3011	the processing is completely transparent to the document user. To take a
				3012	concrete example, suppose you are authoring a DocBook document, this one
				3013	starts with the following DOCTYPE definition:</p>
				3014	<pre><?xml version='1.0'?>
				3015	<!DOCTYPE book PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.4//EN"
				3016	"http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd"></pre>
				3017
				3018	<p>When validating the document with libxml, the catalog will be
				3019	automatically consulted to lookup the public identifier "-//Norman Walsh//DTD
				3020	DocBk XML V3.1.4//EN" and the system identifier
				3021	"http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd", and if these entities have
				3022	been installed on your system and the catalogs actually point to them, libxml
				3023	will fetch them from the local disk.</p>
				3024
				3025	<p style="font-size: 10pt"><strong>Note</strong>: Really don't use this
				3026	DOCTYPE example it's a really old version, but is fine as an example.</p>
				3027
				3028	<p>Libxml will check the catalog each time that it is requested to load an
				3029	entity, this includes DTD, external parsed entities, stylesheets, etc ... If
				3030	your system is correctly configured all the authoring phase and processing
				3031	should use only local files, even if your document stays portable because it
				3032	uses the canonical public and system ID, referencing the remote document.</p>
				3033
				3034	<h3><a name="Some">Some examples:</a></h3>
				3035
				3036	<p>Here is a couple of fragments from XML Catalogs used in libxml early
				3037	regression tests in <code>test/catalogs</code> :</p>
				3038	<pre><?xml version="1.0"?>
				3039	<!DOCTYPE catalog PUBLIC
				3040	"-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3041	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3042	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
				3043	<public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
				3044	uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
				3045	...</pre>
				3046
				3047	<p>This is the beginning of a catalog for DocBook 4.1.2, XML Catalogs are
				3048	written in XML, there is a specific namespace for catalog elements
				3049	"urn:oasis:names:tc:entity:xmlns:xml:catalog". The first entry in this
				3050	catalog is a <code>public</code> mapping it allows to associate a Public
				3051	Identifier with an URI.</p>
				3052	<pre>...
				3053	<rewriteSystem systemIdStartString="http://www.oasis-open.org/docbook/"
				3054	rewritePrefix="file:///usr/share/xml/docbook/"/>
				3055	...</pre>
				3056
				3057	<p>A <code>rewriteSystem</code> is a very powerful instruction, it says that
				3058	any URI starting with a given prefix should be looked at another URI
				3059	constructed by replacing the prefix with an new one. In effect this acts like
				3060	a cache system for a full area of the Web. In practice it is extremely useful
				3061	with a file prefix if you have installed a copy of those resources on your
				3062	local system.</p>
				3063	<pre>...
				3064	<delegatePublic publicIdStartString="-//OASIS//DTD XML Catalog //"
				3065	catalog="file:///usr/share/xml/docbook.xml"/>
				3066	<delegatePublic publicIdStartString="-//OASIS//ENTITIES DocBook XML"
				3067	catalog="file:///usr/share/xml/docbook.xml"/>
				3068	<delegatePublic publicIdStartString="-//OASIS//DTD DocBook XML"
				3069	catalog="file:///usr/share/xml/docbook.xml"/>
				3070	<delegateSystem systemIdStartString="http://www.oasis-open.org/docbook/"
				3071	catalog="file:///usr/share/xml/docbook.xml"/>
				3072	<delegateURI uriStartString="http://www.oasis-open.org/docbook/"
				3073	catalog="file:///usr/share/xml/docbook.xml"/>
				3074	...</pre>
				3075
				3076	<p>Delegation is the core features which allows to build a tree of catalogs,
				3077	easier to maintain than a single catalog, based on Public Identifier, System
				3078	Identifier or URI prefixes it instructs the catalog software to look up
				3079	entries in another resource. This feature allow to build hierarchies of
				3080	catalogs, the set of entries presented should be sufficient to redirect the
				3081	resolution of all DocBook references to the specific catalog in
				3082	<code>/usr/share/xml/docbook.xml</code> this one in turn could delegate all
				3083	references for DocBook 4.2.1 to a specific catalog installed at the same time
				3084	as the DocBook resources on the local machine.</p>
				3085
				3086	<h3><a name="reference">How to tune catalog usage:</a></h3>
				3087
				3088	<p>The user can change the default catalog behaviour by redirecting queries
				3089	to its own set of catalogs, this can be done by setting the
				3090	<code>XML_CATALOG_FILES</code> environment variable to a list of catalogs, an
				3091	empty one should deactivate loading the default <code>/etc/xml/catalog</code>
				3092	default catalog</p>
				3093
				3094	<h3><a name="validate">How to debug catalog processing:</a></h3>
				3095
				3096	<p>Setting up the <code>XML_DEBUG_CATALOG</code> environment variable will
				3097	make libxml output debugging informations for each catalog operations, for
				3098	example:</p>
				3099	<pre>orchis:~/XML -> xmllint --memory --noout test/ent2
				3100	warning: failed to load external entity "title.xml"
				3101	orchis:~/XML -> export XML_DEBUG_CATALOG=
				3102	orchis:~/XML -> xmllint --memory --noout test/ent2
				3103	Failed to parse catalog /etc/xml/catalog
				3104	Failed to parse catalog /etc/xml/catalog
				3105	warning: failed to load external entity "title.xml"
				3106	Catalogs cleanup
				3107	orchis:~/XML -> </pre>
				3108
				3109	<p>The test/ent2 references an entity, running the parser from memory makes
				3110	the base URI unavailable and the the "title.xml" entity cannot be loaded.
				3111	Setting up the debug environment variable allows to detect that an attempt is
				3112	made to load the <code>/etc/xml/catalog</code> but since it's not present the
				3113	resolution fails.</p>
				3114
				3115	<p>But the most advanced way to debug XML catalog processing is to use the
				3116	<strong>xmlcatalog</strong> command shipped with libxml2, it allows to load
				3117	catalogs and make resolution queries to see what is going on. This is also
				3118	used for the regression tests:</p>
				3119	<pre>orchis:~/XML -> ./xmlcatalog test/catalogs/docbook.xml \
				3120	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3121	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3122	orchis:~/XML -> </pre>
				3123
				3124	<p>For debugging what is going on, adding one -v flags increase the verbosity
				3125	level to indicate the processing done (adding a second flag also indicate
				3126	what elements are recognized at parsing):</p>
				3127	<pre>orchis:~/XML -> ./xmlcatalog -v test/catalogs/docbook.xml \
				3128	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3129	Parsing catalog test/catalogs/docbook.xml's content
				3130	Found public match -//OASIS//DTD DocBook XML V4.1.2//EN
				3131	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3132	Catalogs cleanup
				3133	orchis:~/XML -> </pre>
				3134
				3135	<p>A shell interface is also available to debug and process multiple queries
				3136	(and for regression tests):</p>
				3137	<pre>orchis:~/XML -> ./xmlcatalog -shell test/catalogs/docbook.xml \
				3138	"-//OASIS//DTD DocBook XML V4.1.2//EN"
				3139	> help
				3140	Commands available:
				3141	public PublicID: make a PUBLIC identifier lookup
				3142	system SystemID: make a SYSTEM identifier lookup
				3143	resolve PublicID SystemID: do a full resolver lookup
				3144	add 'type' 'orig' 'replace' : add an entry
				3145	del 'values' : remove values
				3146	dump: print the current catalog state
				3147	debug: increase the verbosity level
				3148	quiet: decrease the verbosity level
				3149	exit: quit the shell
				3150	> public "-//OASIS//DTD DocBook XML V4.1.2//EN"
				3151	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
				3152	> quit
				3153	orchis:~/XML -> </pre>
				3154
				3155	<p>This should be sufficient for most debugging purpose, this was actually
				3156	used heavily to debug the XML Catalog implementation itself.</p>
				3157
				3158	<h3><a name="Declaring">How to create and maintain</a> catalogs:</h3>
				3159
				3160	<p>Basically XML Catalogs are XML files, you can either use XML tools to
				3161	manage them or use <strong>xmlcatalog</strong> for this. The basic step is
				3162	to create a catalog the -create option provide this facility:</p>
				3163	<pre>orchis:~/XML -> ./xmlcatalog --create tst.xml
				3164	<?xml version="1.0"?>
				3165	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3166	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3167	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
				3168	orchis:~/XML -> </pre>
				3169
				3170	<p>By default xmlcatalog does not overwrite the original catalog and save the
				3171	result on the standard output, this can be overridden using the -noout
				3172	option. The <code>-add</code> command allows to add entries in the
				3173	catalog:</p>
				3174	<pre>orchis:~/XML -> ./xmlcatalog --noout --create --add "public" \
				3175	"-//OASIS//DTD DocBook XML V4.1.2//EN" \
				3176	http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd tst.xml
				3177	orchis:~/XML -> cat tst.xml
				3178	<?xml version="1.0"?>
				3179	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" \
				3180	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3181	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
				3182	<public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
				3183	uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
				3184	</catalog>
				3185	orchis:~/XML -> </pre>
				3186
				3187	<p>The <code>-add</code> option will always take 3 parameters even if some of
				3188	the XML Catalog constructs (like nextCatalog) will have only a single
				3189	argument, just pass a third empty string, it will be ignored.</p>
				3190
				3191	<p>Similarly the <code>-del</code> option remove matching entries from the
				3192	catalog:</p>
				3193	<pre>orchis:~/XML -> ./xmlcatalog --del \
				3194	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" tst.xml
				3195	<?xml version="1.0"?>
				3196	<!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
				3197	"http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
				3198	<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
				3199	orchis:~/XML -> </pre>
				3200
				3201	<p>The catalog is now empty. Note that the matching of <code>-del</code> is
				3202	exact and would have worked in a similar fashion with the Public ID
				3203	string.</p>
				3204
				3205	<p>This is rudimentary but should be sufficient to manage a not too complex
				3206	catalog tree of resources.</p>
				3207
				3208	<h3><a name="implemento">The implementor corner quick review of the
				3209	API:</a></h3>
				3210
				3211	<p>First, and like for every other module of libxml, there is an
				3212	automatically generated <a href="html/libxml-catalog.html">API page for
				3213	catalog support</a>.</p>
				3214
				3215	<p>The header for the catalog interfaces should be included as:</p>
				3216	<pre>#include <libxml/catalog.h></pre>
				3217
				3218	<p>The API is voluntarily kept very simple. First it is not obvious that
				3219	applications really need access to it since it is the default behaviour of
				3220	libxml (Note: it is possible to completely override libxml default catalog by
				3221	using <a href="html/libxml-parser.html">xmlSetExternalEntityLoader</a> to
				3222	plug an application specific resolver).</p>
				3223
				3224	<p>Basically libxml support 2 catalog lists:</p>
				3225	<ul>
				3226	<li>the default one, global shared by all the application</li>
				3227	<li>a per-document catalog, this one is built if the document uses the
				3228	<code>oasis-xml-catalog</code> PIs to specify its own catalog list, it is
				3229	associated to the parser context and destroyed when the parsing context
				3230	is destroyed.</li>
				3231	</ul>
				3232
				3233	<p>the document one will be used first if it exists.</p>
				3234
				3235	<h4>Initialization routines:</h4>
				3236
				3237	<p>xmlInitializeCatalog(), xmlLoadCatalog() and xmlLoadCatalogs() should be
				3238	used at startup to initialize the catalog, if the catalog should be
				3239	initialized with specific values xmlLoadCatalog() or xmlLoadCatalogs()
				3240	should be called before xmlInitializeCatalog() which would otherwise do a
				3241	default initialization first.</p>
				3242
				3243	<p>The xmlCatalogAddLocal() call is used by the parser to grow the document
				3244	own catalog list if needed.</p>
				3245
				3246	<h4>Preferences setup:</h4>
				3247
				3248	<p>The XML Catalog spec requires the possibility to select default
				3249	preferences between public and system delegation,
				3250	xmlCatalogSetDefaultPrefer() allows this, xmlCatalogSetDefaults() and
				3251	xmlCatalogGetDefaults() allow to control if XML Catalogs resolution should
				3252	be forbidden, allowed for global catalog, for document catalog or both, the
				3253	default is to allow both.</p>
				3254
				3255	<p>And of course xmlCatalogSetDebug() allows to generate debug messages
				3256	(through the xmlGenericError() mechanism).</p>
				3257
				3258	<h4>Querying routines:</h4>
				3259
				3260	<p>xmlCatalogResolve(), xmlCatalogResolveSystem(), xmlCatalogResolvePublic()
				3261	and xmlCatalogResolveURI() are relatively explicit if you read the XML
				3262	Catalog specification they correspond to section 7 algorithms, they should
				3263	also work if you have loaded an SGML catalog with a simplified semantic.</p>
				3264
				3265	<p>xmlCatalogLocalResolve() and xmlCatalogLocalResolveURI() are the same but
				3266	operate on the document catalog list</p>
				3267
				3268	<h4>Cleanup and Miscellaneous:</h4>
				3269
				3270	<p>xmlCatalogCleanup() free-up the global catalog, xmlCatalogFreeLocal() is
				3271	the per-document equivalent.</p>
				3272
				3273	<p>xmlCatalogAdd() and xmlCatalogRemove() are used to dynamically modify the
				3274	first catalog in the global list, and xmlCatalogDump() allows to dump a
				3275	catalog state, those routines are primarily designed for xmlcatalog, I'm not
				3276	sure that exposing more complex interfaces (like navigation ones) would be
				3277	really useful.</p>
				3278
				3279	<p>The xmlParseCatalogFile() is a function used to load XML Catalog files,
				3280	it's similar as xmlParseFile() except it bypass all catalog lookups, it's
				3281	provided because this functionality may be useful for client tools.</p>
				3282
				3283	<h4>threaded environments:</h4>
				3284
				3285	<p>Since the catalog tree is built progressively, some care has been taken to
				3286	try to avoid troubles in multithreaded environments. The code is now thread
				3287	safe assuming that the libxml library has been compiled with threads
				3288	support.</p>
				3289
				3290	<p></p>
				3291
				3292	<h3><a name="Other">Other resources</a></h3>
				3293
				3294	<p>The XML Catalog specification is relatively recent so there isn't much
				3295	literature to point at:</p>
				3296	<ul>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3297	<li>You can find a good rant from Norm Walsh about <a
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3298	href="http://www.arbortext.com/Think_Tank/XML_Resources/Issue_Three/issue_three.html">the
				3299	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]	3300	I don't agree with everything presented. Norm also wrote a more recent
				3301	article <a
				3302	href="http://wwws.sun.com/software/xml/developers/resolver/article/">XML
				3303	entities and URI resolvers</a> describing them.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3304	<li>An <a href="http://home.ccil.org/~cowan/XML/XCatalog.html">old XML
				3305	catalog proposal</a> from John Cowan</li>
				3306	<li>The <a href="http://www.rddl.org/">Resource Directory Description
				3307	Language</a> (RDDL) another catalog system but more oriented toward
				3308	providing metadata for XML namespaces.</li>
				3309	<li>the page from the OASIS Technical <a
				3310	href="http://www.oasis-open.org/committees/entity/">Committee on Entity
				3311	Resolution</a> who maintains XML Catalog, you will find pointers to the
				3312	specification update, some background and pointers to others tools
				3313	providing XML Catalog support</li>
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	3314	<li>Here is a <a href="buildDocBookCatalog">shell script</a> to generate
				3315	XML Catalogs for DocBook 4.1.2 . If it can write to the /etc/xml/
				3316	directory, it will set-up /etc/xml/catalog and /etc/xml/docbook based on
				3317	the resources found on the system. Otherwise it will just create
				3318	~/xmlcatalog and ~/dbkxmlcatalog and doing:
Daniel Veillard	8594de9	2003-04-25 10:08:44 +0000	[diff] [blame]	3319	<p><code>export XML_CATALOG_FILES=$HOME/xmlcatalog</code></p>
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	3320	<p>should allow to process DocBook documentations without requiring
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3321	network accesses for the DTD or stylesheets</p>
Daniel Veillard	35e937a	2002-01-19 22:21:54 +0000	[diff] [blame]	3322	</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3323	<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]	3324	small tarball</a> containing XML Catalogs for DocBook 4.1.2 which seems
				3325	to work fine for me too</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3326	<li>The <a href="http://www.xmlsoft.org/xmlcatalog_man.html">xmlcatalog
				3327	manual page</a></li>
				3328	</ul>
				3329
				3330	<p>If you have suggestions for corrections or additions, simply contact
				3331	me:</p>
				3332
				3333	<h2><a name="library">The parser interfaces</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3334
				3335	<p>This section is directly intended to help programmers getting bootstrapped
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3336	using the XML library from the C language. It is not intended to be
				3337	extensive. I hope the automatically generated documents will provide the
				3338	completeness required, but as a separate set of documents. The interfaces of
				3339	the XML library are by principle low level, there is nearly zero abstraction.
				3340	Those interested in a higher level API should <a href="#DOM">look at
				3341	DOM</a>.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	3342
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	3343	<p>The <a href="html/libxml-parser.html">parser interfaces for XML</a> are
				3344	separated from the <a href="html/libxml-htmlparser.html">HTML parser
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3345	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]	3346
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3347	<h3><a name="Invoking">Invoking the parser : the pull method</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3348
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3349	<p>Usually, the first thing to do is to read an XML input. The parser accepts
				3350	documents either from in-memory strings or from files. The functions are
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3351	defined in "parser.h":</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3352	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3353	<dt><code>xmlDocPtr xmlParseMemory(char *buffer, int size);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3354	<dd><p>Parse a null-terminated string containing the document.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3355	</dd>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3356	</dl>
				3357	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3358	<dt><code>xmlDocPtr xmlParseFile(const char *filename);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3359	<dd><p>Parse an XML document contained in a (possibly compressed)
				3360	file.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3361	</dd>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3362	</dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3363
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3364	<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]	3365	failure).</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3366
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3367	<h3 id="Invoking1">Invoking the parser: the push method</h3>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3368
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3369	<p>In order for the application to keep the control when the document is
				3370	being fetched (which is common for GUI based programs) libxml provides a push
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3371	interface, too, as of version 1.8.3. Here are the interface functions:</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3372	<pre>xmlParserCtxtPtr xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax,
				3373	void *user_data,
				3374	const char *chunk,
				3375	int size,
				3376	const char *filename);
				3377	int xmlParseChunk (xmlParserCtxtPtr ctxt,
				3378	const char *chunk,
				3379	int size,
				3380	int terminate);</pre>
				3381
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3382	<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]	3383	<pre> FILE *f;
				3384
				3385	f = fopen(filename, "r");
				3386	if (f != NULL) {
				3387	int res, size = 1024;
				3388	char chars[1024];
				3389	xmlParserCtxtPtr ctxt;
				3390
				3391	res = fread(chars, 1, 4, f);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3392	if (res > 0) {
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3393	ctxt = xmlCreatePushParserCtxt(NULL, NULL,
				3394	chars, res, filename);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3395	while ((res = fread(chars, 1, size, f)) > 0) {
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3396	xmlParseChunk(ctxt, chars, res, 0);
				3397	}
				3398	xmlParseChunk(ctxt, chars, 0, 1);
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3399	doc = ctxt->myDoc;
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3400	xmlFreeParserCtxt(ctxt);
				3401	}
				3402	}</pre>
				3403
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3404	<p>The HTML parser embedded into libxml also has a push interface; the
				3405	functions are just prefixed by "html" rather than "xml".</p>
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3406
				3407	<h3 id="Invoking2">Invoking the parser: the SAX interface</h3>
				3408
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3409	<p>The tree-building interface makes the parser memory-hungry, first loading
				3410	the document in memory and then building the tree itself. Reading a document
				3411	without building the tree is possible using the SAX interfaces (see SAX.h and
				3412	<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]	3413	Henstridge's documentation</a>). Note also that the push interface can be
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3414	limited to SAX: just use the two first arguments of
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3415	<code>xmlCreatePushParserCtxt()</code>.</p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	3416
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3417	<h3><a name="Building">Building a tree from scratch</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3418
				3419	<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]	3420	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]	3421	also described in <libxml/tree.h>.) For example, here is a piece of
				3422	code that produces the XML document used in the previous examples:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3423	<pre> #include <libxml/tree.h>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	3424	xmlDocPtr doc;
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3425	xmlNodePtr tree, subtree;
				3426
				3427	doc = xmlNewDoc("1.0");
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3428	doc->children = xmlNewDocNode(doc, NULL, "EXAMPLE", NULL);
				3429	xmlSetProp(doc->children, "prop1", "gnome is great");
				3430	xmlSetProp(doc->children, "prop2", "& linux too");
				3431	tree = xmlNewChild(doc->children, NULL, "head", NULL);
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3432	subtree = xmlNewChild(tree, NULL, "title", "Welcome to Gnome");
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3433	tree = xmlNewChild(doc->children, NULL, "chapter", NULL);
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3434	subtree = xmlNewChild(tree, NULL, "title", "The Linux adventure");
				3435	subtree = xmlNewChild(tree, NULL, "p", "bla bla bla ...");
				3436	subtree = xmlNewChild(tree, NULL, "image", NULL);
				3437	xmlSetProp(subtree, "href", "linus.gif");</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3438
				3439	<p>Not really rocket science ...</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3440
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3441	<h3><a name="Traversing">Traversing the tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3442
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	3443	<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]	3444	code has access to the internal structure of all the elements of the tree.
				3445	The names should be somewhat simple like <strong>parent</strong>,
Daniel Veillard	306be99	2000-07-03 12:38:45 +0000	[diff] [blame]	3446	<strong>children</strong>, <strong>next</strong>, <strong>prev</strong>,
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3447	<strong>properties</strong>, etc... For example, still with the previous
Daniel Veillard	0142b84	2000-01-14 14:45:24 +0000	[diff] [blame]	3448	example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3449	<pre><code>doc->children->children->children</code></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3450
				3451	<p>points to the title element,</p>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3452	<pre>doc->children->children->next->children->children</pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3453
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3454	<p>points to the text node containing the chapter title "The Linux
				3455	adventure".</p>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3456
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	3457	<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]	3458	present before the document root, so <code>doc->children</code> may point
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3459	to an element which is not the document Root Element; a function
Daniel Veillard	5cb5ab8	1999-12-21 15:35:29 +0000	[diff] [blame]	3460	<code>xmlDocGetRootElement()</code> was added for this purpose.</p>
Daniel Veillard	b24054a	1999-12-18 15:32:46 +0000	[diff] [blame]	3461
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3462	<h3><a name="Modifying">Modifying the tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3463
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3464	<p>Functions are provided for reading and writing the document content. Here
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	3465	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]	3466	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	3467	<dt><code>xmlAttrPtr xmlSetProp(xmlNodePtr node, const xmlChar *name, const
				3468	xmlChar *value);</code></dt>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3469	<dd><p>This sets (or changes) an attribute carried by an ELEMENT node.
				3470	The value can be NULL.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3471	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3472	</dl>
				3473	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	3474	<dt><code>const xmlChar *xmlGetProp(xmlNodePtr node, const xmlChar
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3475	*name);</code></dt>
Daniel Veillard	c92c304	2000-09-29 02:42:04 +0000	[diff] [blame]	3476	<dd><p>This function returns a pointer to new copy of the property
				3477	content. Note that the user must deallocate the result.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3478	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3479	</dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3480
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3481	<p>Two functions are provided for reading and writing the text associated
				3482	with elements:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3483	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	3484	<dt><code>xmlNodePtr xmlStringGetNodeList(xmlDocPtr doc, const xmlChar
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3485	*value);</code></dt>
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3486	<dd><p>This function takes an "external" string and converts it to one
				3487	text node or possibly to a list of entity and text nodes. All
				3488	non-predefined entity references like &Gnome; will be stored
				3489	internally as entity nodes, hence the result of the function may not be
				3490	a single node.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3491	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3492	</dl>
				3493	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	3494	<dt><code>xmlChar *xmlNodeListGetString(xmlDocPtr doc, xmlNodePtr list, int
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3495	inLine);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3496	<dd><p>This function is the inverse of
				3497	<code>xmlStringGetNodeList()</code>. It generates a new string
				3498	containing the content of the text and entity nodes. Note the extra
				3499	argument inLine. If this argument is set to 1, the function will expand
				3500	entity references. For example, instead of returning the &Gnome;
				3501	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]	3502	"GNU Network Object Model Environment").</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3503	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3504	</dl>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3505
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3506	<h3><a name="Saving">Saving a tree</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3507
				3508	<p>Basically 3 options are possible:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3509	<dl>
Daniel Veillard	dd6b367	1999-09-23 22:19:22 +0000	[diff] [blame]	3510	<dt><code>void xmlDocDumpMemory(xmlDocPtr cur, xmlChar**mem, int
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3511	*size);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3512	<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]	3513	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3514	</dl>
				3515	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3516	<dt><code>extern void xmlDocDump(FILE *f, xmlDocPtr doc);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3517	<dd><p>Dumps a document to an open file descriptor.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3518	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3519	</dl>
				3520	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3521	<dt><code>int xmlSaveFile(const char *filename, xmlDocPtr cur);</code></dt>
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3522	<dd><p>Saves the document to a file. In this case, the compression
				3523	interface is triggered if it has been turned on.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3524	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3525	</dl>
Daniel Veillard	10c6a8f	1998-10-28 01:00:12 +0000	[diff] [blame]	3526
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3527	<h3><a name="Compressio">Compression</a></h3>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3528
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3529	<p>The library transparently handles compression when doing file-based
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3530	accesses. The level of compression on saves can be turned on either globally
				3531	or individually for one file:</p>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3532	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3533	<dt><code>int xmlGetDocCompressMode (xmlDocPtr doc);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3534	<dd><p>Gets the document compression ratio (0-9).</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3535	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3536	</dl>
				3537	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3538	<dt><code>void xmlSetDocCompressMode (xmlDocPtr doc, int mode);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3539	<dd><p>Sets the document compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3540	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3541	</dl>
				3542	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3543	<dt><code>int xmlGetCompressMode(void);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3544	<dd><p>Gets the default compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3545	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3546	</dl>
				3547	<dl>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3548	<dt><code>void xmlSetCompressMode(int mode);</code></dt>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3549	<dd><p>Sets the default compression ratio.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3550	</dd>
Daniel Veillard	25940b7	1998-10-29 05:51:30 +0000	[diff] [blame]	3551	</dl>
				3552
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3553	<h2><a name="Entities">Entities or no entities</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3554
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3555	<p>Entities in principle are similar to simple C macros. An entity defines an
				3556	abbreviation for a given string that you can reuse many times throughout the
				3557	content of your document. Entities are especially useful when a given string
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3558	may occur frequently within a document, or to confine the change needed to a
				3559	document to a restricted area in the internal subset of the document (at the
				3560	beginning). Example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3561	<pre>1 <?xml version="1.0"?>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3562	2 <!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3563	3 <!ENTITY xml "Extensible Markup Language">
				3564	4 ]>
				3565	5 <EXAMPLE>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3566	6 &xml;
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3567	7 </EXAMPLE></pre>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3568
				3569	<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]	3570	its name with '&' and following it by ';' without any spaces added. There
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3571	are 5 predefined entities in libxml allowing you to escape characters with
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3572	predefined meaning in some parts of the xml document content:
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3573	<strong>&lt;</strong> for the character '<', <strong>&gt;</strong>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3574	for the character '>', <strong>&apos;</strong> for the character ''',
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3575	<strong>&quot;</strong> for the character '"', and
				3576	<strong>&amp;</strong> for the character '&'.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3577
				3578	<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]	3579	substitute an entity's content so that you can see the replacement text in
				3580	your application. Or you may prefer to keep entity references as such in the
				3581	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]	3582	precious information (if the user went through the pain of explicitly
				3583	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]	3584	substitute them as saving time). The <a
Daniel Veillard	9cb5ff4	2001-01-29 08:22:21 +0000	[diff] [blame]	3585	href="html/libxml-parser.html#XMLSUBSTITUTEENTITIESDEFAULT">xmlSubstituteEntitiesDefault()</a>
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3586	function allows you to check and change the behaviour, which is to not
				3587	substitute entities by default.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3588
				3589	<p>Here is the DOM tree built by libxml for the previous document in the
				3590	default case:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3591	<pre>/gnome/src/gnome-xml -> ./xmllint --debug test/ent1
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3592	DOCUMENT
				3593	version=1.0
				3594	ELEMENT EXAMPLE
				3595	TEXT
				3596	content=
				3597	ENTITY_REF
				3598	INTERNAL_GENERAL_ENTITY xml
				3599	content=Extensible Markup Language
				3600	TEXT
				3601	content=</pre>
				3602
				3603	<p>And here is the result when substituting entities:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3604	<pre>/gnome/src/gnome-xml -> ./tester --debug --noent test/ent1
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3605	DOCUMENT
				3606	version=1.0
				3607	ELEMENT EXAMPLE
				3608	TEXT
				3609	content= Extensible Markup Language</pre>
				3610
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3611	<p>So, entities or no entities? Basically, it depends on your use case. I
				3612	suggest that you keep the non-substituting default behaviour and avoid using
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3613	entities in your XML document or data if you are not willing to handle the
				3614	entity references elements in the DOM tree.</p>
				3615
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3616	<p>Note that at save time libxml enforces the conversion of the predefined
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3617	entities where necessary to prevent well-formedness problems, and will also
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3618	transparently replace those with chars (i.e. it will not generate entity
Daniel Veillard	88f00ae	2000-03-02 00:15:55 +0000	[diff] [blame]	3619	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]	3620	finding them in the input).</p>
				3621
Daniel Veillard	7b9c4b7	2000-08-25 16:26:50 +0000	[diff] [blame]	3622	<p><span style="background-color: #FF0000">WARNING</span>: handling entities
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3623	on top of the libxml SAX interface is difficult!!! If you plan to use
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3624	non-predefined entities in your documents, then the learning curve to handle
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3625	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]	3626	strongly suggest you consider using the DOM interface instead and let libxml
Daniel Veillard	8c6d6af	2000-08-25 17:14:13 +0000	[diff] [blame]	3627	deal with the complexity rather than trying to do it yourself.</p>
Daniel Veillard	7b9c4b7	2000-08-25 16:26:50 +0000	[diff] [blame]	3628
Daniel Veillard	2f4dfc4	1999-09-24 14:03:48 +0000	[diff] [blame]	3629	<h2><a name="Namespaces">Namespaces</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3630
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	3631	<p>The libxml library implements <a
				3632	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]	3633	recognizing namespace constructs in the input, and does namespace lookup
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	3634	automatically when building the DOM tree. A namespace declaration is
				3635	associated with an in-memory structure and all elements or attributes within
				3636	that namespace point to it. Hence testing the namespace is a simple and fast
				3637	equality operation at the user level.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3638
Daniel Veillard	f13e1ed	2000-03-06 07:41:49 +0000	[diff] [blame]	3639	<p>I suggest that people using libxml use a namespace, and declare it in the
				3640	root element of their document as the default namespace. Then they don't need
				3641	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]	3642	refinement and merging of data from different sources. This doesn't increase
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3643	the size of the XML output significantly, but significantly increases its
				3644	value in the long-term. Example:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3645	<pre><mydoc xmlns="http://mydoc.example.org/schemas/">
				3646	<elem1>...</elem1>
				3647	<elem2>...</elem2>
				3648	</mydoc></pre>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3649
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3650	<p>The namespace value has to be an absolute URL, but the URL doesn't have to
				3651	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]	3652	attributes with that URL. I suggest to use an URL within a domain you
				3653	control, and that the URL should contain some kind of version information if
				3654	possible. For example, <code>"http://www.gnome.org/gnumeric/1.0/"</code> is a
				3655	good namespace scheme.</p>
Daniel Veillard	ec30341	2000-03-24 13:41:54 +0000	[diff] [blame]	3656
				3657	<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]	3658	version-independent prefix is installed on the root element of your document,
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3659	and if the version information don't match something you know, warn the user
				3660	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]	3661	namespace checking on the prefix value. <foo:text> may be exactly the
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3662	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]	3663	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]	3664	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]	3665	<code>ns</code> field pointing to an xmlNs structure detailing the namespace
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3666	prefix and its URI.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3667
				3668	<p>@@Interfaces@@</p>
				3669
				3670	<p>@@Examples@@</p>
				3671
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3672	<p>Usually people object to using namespaces together with validity checking.
				3673	I will try to make sure that using namespaces won't break validity checking,
				3674	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]	3675	suggest adding namespaces to your document. A default namespace scheme
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3676	<code>xmlns="http://...."</code> should not break validity even on less
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3677	flexible parsers. Using namespaces to mix and differentiate content coming
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3678	from multiple DTDs will certainly break current validation schemes. I will
				3679	try to provide ways to do this, but this may not be portable or
				3680	standardized.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3681
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3682	<h2><a name="Upgrading">Upgrading 1.x code</a></h2>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3683
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3684	<p>Incompatible changes:</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3685
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3686	<p>Version 2 of libxml is the first version introducing serious backward
				3687	incompatible changes. The main goals were:</p>
				3688	<ul>
				3689	<li>a general cleanup. A number of mistakes inherited from the very early
				3690	versions couldn't be changed due to compatibility constraints. Example
				3691	the "childs" element in the nodes.</li>
				3692	<li>Uniformization of the various nodes, at least for their header and link
				3693	parts (doc, parent, children, prev, next), the goal is a simpler
				3694	programming model and simplifying the task of the DOM implementors.</li>
				3695	<li>better conformances to the XML specification, for example version 1.x
				3696	had an heuristic to try to detect ignorable white spaces. As a result the
				3697	SAX event generated were ignorableWhitespace() while the spec requires
				3698	character() in that case. This also mean that a number of DOM node
				3699	containing blank text may populate the DOM tree which were not present
				3700	before.</li>
				3701	</ul>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3702
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3703	<h3>How to fix libxml-1.x code:</h3>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3704
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3705	<p>So client code of libxml designed to run with version 1.x may have to be
				3706	changed to compile against version 2.x of libxml. Here is a list of changes
				3707	that I have collected, they may not be sufficient, so in case you find other
				3708	change which are required, <a href="mailto:Daniel.Ïeillardw3.org">drop me a
				3709	mail</a>:</p>
				3710	<ol>
				3711	<li>The package name have changed from libxml to libxml2, the library name
				3712	is now -lxml2 . There is a new xml2-config script which should be used to
				3713	select the right parameters libxml2</li>
				3714	<li>Node <strong>childs</strong> field has been renamed
				3715	<strong>children</strong> so s/childs/children/g should be applied
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3716	(probability of having "childs" anywhere else is close to 0+</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3717	<li>The document don't have anymore a <strong>root</strong> element it has
				3718	been replaced by <strong>children</strong> and usually you will get a
				3719	list of element here. For example a Dtd element for the internal subset
				3720	and it's declaration may be found in that list, as well as processing
				3721	instructions or comments found before or after the document root element.
				3722	Use <strong>xmlDocGetRootElement(doc)</strong> to get the root element of
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3723	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]	3724	PIs or comments before or after the root element
				3725	s/->root/->children/g will probably do it.</li>
				3726	<li>The white space issue, this one is more complex, unless special case of
				3727	validating parsing, the line breaks and spaces usually used for indenting
				3728	and formatting the document content becomes significant. So they are
				3729	reported by SAX and if your using the DOM tree, corresponding nodes are
				3730	generated. Too approach can be taken:
				3731	<ol>
				3732	<li>lazy one, use the compatibility call
				3733	<strong>xmlKeepBlanksDefault(0)</strong> but be aware that you are
				3734	relying on a special (and possibly broken) set of heuristics of
				3735	libxml to detect ignorable blanks. Don't complain if it breaks or
				3736	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]	3737	<li>the Right Way: change you code to accept possibly insignificant
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3738	blanks characters, or have your tree populated with weird blank text
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3739	nodes. You can spot them using the commodity function
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3740	<strong>xmlIsBlankNode(node)</strong> returning 1 for such blank
				3741	nodes.</li>
				3742	</ol>
				3743	<p>Note also that with the new default the output functions don't add any
				3744	extra indentation when saving a tree in order to be able to round trip
				3745	(read and save) without inflating the document with extra formatting
				3746	chars.</p>
				3747	</li>
				3748	<li>The include path has changed to $prefix/libxml/ and the includes
				3749	themselves uses this new prefix in includes instructions... If you are
				3750	using (as expected) the
				3751	<pre>xml2-config --cflags</pre>
				3752	<p>output to generate you compile commands this will probably work out of
				3753	the box</p>
				3754	</li>
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3755	<li>xmlDetectCharEncoding takes an extra argument indicating the length in
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3756	byte of the head of the document available for character detection.</li>
				3757	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3758
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3759	<h3>Ensuring both libxml-1.x and libxml-2.x compatibility</h3>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3760
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3761	<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]	3762	to allow smooth upgrade of existing libxml v1code while retaining
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3763	compatibility. They offers the following:</p>
				3764	<ol>
				3765	<li>similar include naming, one should use
				3766	<strong>#include<libxml/...></strong> in both cases.</li>
				3767	<li>similar identifiers defined via macros for the child and root fields:
				3768	respectively <strong>xmlChildrenNode</strong> and
				3769	<strong>xmlRootNode</strong></li>
				3770	<li>a new macro <strong>LIBXML_TEST_VERSION</strong> which should be
				3771	inserted once in the client code</li>
				3772	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3773
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3774	<p>So the roadmap to upgrade your existing libxml applications is the
				3775	following:</p>
				3776	<ol>
				3777	<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]	3778	<li>find all occurrences where the xmlDoc <strong>root</strong> field is
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3779	used and change it to <strong>xmlRootNode</strong></li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	3780	<li>similarly find all occurrences where the xmlNode
				3781	<strong>childs</strong> field is used and change it to
				3782	<strong>xmlChildrenNode</strong></li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3783	<li>add a <strong>LIBXML_TEST_VERSION</strong> macro somewhere in your
				3784	<strong>main()</strong> or in the library init entry point</li>
				3785	<li>Recompile, check compatibility, it should still work</li>
Daniel Veillard	c0801af	2002-05-28 16:28:42 +0000	[diff] [blame]	3786	<li>Change your configure script to look first for xml2-config and fall
				3787	back using xml-config . Use the --cflags and --libs output of the command
				3788	as the Include and Linking parameters needed to use libxml.</li>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3789	<li>install libxml2-2.3.x and libxml2-devel-2.3.x (libxml-1.8.y and
				3790	libxml-devel-1.8.y can be kept simultaneously)</li>
				3791	<li>remove your config.cache, relaunch your configuration mechanism, and
				3792	recompile, if steps 2 and 3 were done right it should compile as-is</li>
				3793	<li>Test that your application is still running correctly, if not this may
				3794	be due to extra empty nodes due to formating spaces being kept in libxml2
				3795	contrary to libxml1, in that case insert xmlKeepBlanksDefault(1) in your
				3796	code before calling the parser (next to
				3797	<strong>LIBXML_TEST_VERSION</strong> is a fine place).</li>
				3798	</ol>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3799
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3800	<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]	3801
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	3802	<p>Let me put some emphasis on the fact that there is far more changes from
				3803	libxml 1.x to 2.x than the ones you may have to patch for. The overall code
				3804	has been considerably cleaned up and the conformance to the XML specification
				3805	has been drastically improved too. Don't take those changes as an excuse to
				3806	not upgrade, it may cost a lot on the long term ...</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3807
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	3808	<h2><a name="Thread">Thread safety</a></h2>
				3809
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	3810	<p>Starting with 2.4.7, libxml makes provisions to ensure that concurrent
Daniel Veillard	52dcab3	2001-10-30 12:51:17 +0000	[diff] [blame]	3811	threads can safely work in parallel parsing different documents. There is
				3812	however a couple of things to do to ensure it:</p>
				3813	<ul>
				3814	<li>configure the library accordingly using the --with-threads options</li>
				3815	<li>call xmlInitParser() in the "main" thread before using any of the
				3816	libxml API (except possibly selecting a different memory allocator)</li>
				3817	</ul>
				3818
				3819	<p>Note that the thread safety cannot be ensured for multiple threads sharing
				3820	the same document, the locking must be done at the application level, libxml
				3821	exports a basic mutex and reentrant mutexes API in <libxml/threads.h>.
				3822	The parts of the library checked for thread safety are:</p>
				3823	<ul>
				3824	<li>concurrent loading</li>
				3825	<li>file access resolution</li>
				3826	<li>catalog access</li>
				3827	<li>catalog building</li>
				3828	<li>entities lookup/accesses</li>
				3829	<li>validation</li>
				3830	<li>global variables per-thread override</li>
				3831	<li>memory handling</li>
				3832	</ul>
				3833
				3834	<p>XPath is supposed to be thread safe now, but this wasn't tested
				3835	seriously.</p>
				3836
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	3837	<h2><a name="DOM"></a><a name="Principles">DOM Principles</a></h2>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3838
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3839	<p><a href="http://www.w3.org/DOM/">DOM</a> stands for the <em>Document
				3840	Object Model</em>; this is an API for accessing XML or HTML structured
				3841	documents. Native support for DOM in Gnome is on the way (module gnome-dom),
				3842	and will be based on gnome-xml. This will be a far cleaner interface to
				3843	manipulate XML files within Gnome since it won't expose the internal
				3844	structure.</p>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3845
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3846	<p>The current DOM implementation on top of libxml is the <a
Daniel Veillard	a47fb3d	2001-03-25 17:23:49 +0000	[diff] [blame]	3847	href="http://cvs.gnome.org/lxr/source/gdome2/">gdome2 Gnome module</a>, this
				3848	is a full DOM interface, thanks to Paolo Casarini, check the <a
				3849	href="http://www.cs.unibo.it/~casarini/gdome2/">Gdome2 homepage</a> for more
				3850	informations.</p>
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	3851
Daniel Veillard	3500838	1999-10-25 13:15:52 +0000	[diff] [blame]	3852	<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]	3853
				3854	<p>Here is a real size example, where the actual content of the application
				3855	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]	3856	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]	3857	storage structure. Here is an <a href="gjobs.xml">XML encoded jobs
				3858	base</a>:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3859	<pre><?xml version="1.0"?>
				3860	<gjob:Helping xmlns:gjob="http://www.gnome.org/some-location">
				3861	<gjob:Jobs>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3862
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3863	<gjob:Job>
				3864	<gjob:Project ID="3"/>
				3865	<gjob:Application>GBackup</gjob:Application>
				3866	<gjob:Category>Development</gjob:Category>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3867
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3868	<gjob:Update>
				3869	<gjob:Status>Open</gjob:Status>
				3870	<gjob:Modified>Mon, 07 Jun 1999 20:27:45 -0400 MET DST</gjob:Modified>
				3871	<gjob:Salary>USD 0.00</gjob:Salary>
				3872	</gjob:Update>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3873
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3874	<gjob:Developers>
				3875	<gjob:Developer>
				3876	</gjob:Developer>
				3877	</gjob:Developers>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3878
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3879	<gjob:Contact>
				3880	<gjob:Person>Nathan Clemons</gjob:Person>
				3881	<gjob:Email>nathan@windsofstorm.net</gjob:Email>
				3882	<gjob:Company>
				3883	</gjob:Company>
				3884	<gjob:Organisation>
				3885	</gjob:Organisation>
				3886	<gjob:Webpage>
				3887	</gjob:Webpage>
				3888	<gjob:Snailmail>
				3889	</gjob:Snailmail>
				3890	<gjob:Phone>
				3891	</gjob:Phone>
				3892	</gjob:Contact>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3893
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3894	<gjob:Requirements>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3895	The program should be released as free software, under the GPL.
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3896	</gjob:Requirements>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3897
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3898	<gjob:Skills>
				3899	</gjob:Skills>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3900
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3901	<gjob:Details>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3902	A GNOME based system that will allow a superuser to configure
				3903	compressed and uncompressed files and/or file systems to be backed
				3904	up with a supported media in the system. This should be able to
				3905	perform via find commands generating a list of files that are passed
				3906	to tar, dd, cpio, cp, gzip, etc., to be directed to the tape machine
				3907	or via operations performed on the filesystem itself. Email
				3908	notification and GUI status display very important.
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3909	</gjob:Details>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3910
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3911	</gjob:Job>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3912
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3913	</gjob:Jobs>
				3914	</gjob:Helping></pre>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3915
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3916	<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]	3917	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]	3918	generate the internal structures is harder, and more error prone.</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3919
				3920	<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]	3921	structure. For example, the ordering of the attributes is not significant,
				3922	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]	3923	depend on the order of the children of a given node, unless it really makes
				3924	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]	3925	<pre>/*
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3926	* A person record
				3927	*/
				3928	typedef struct person {
				3929	char *name;
				3930	char *email;
				3931	char *company;
				3932	char *organisation;
				3933	char *smail;
				3934	char *webPage;
				3935	char *phone;
				3936	} person, *personPtr;
				3937
				3938	/*
				3939	* And the code needed to parse it
				3940	*/
				3941	personPtr parsePerson(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
				3942	personPtr ret = NULL;
				3943
				3944	DEBUG("parsePerson\n");
				3945	/*
				3946	* allocate the struct
				3947	*/
				3948	ret = (personPtr) malloc(sizeof(person));
				3949	if (ret == NULL) {
				3950	fprintf(stderr,"out of memory\n");
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3951	return(NULL);
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3952	}
				3953	memset(ret, 0, sizeof(person));
				3954
				3955	/* We don't care what the top level element name is */
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3956	cur = cur->xmlChildrenNode;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3957	while (cur != NULL) {
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3958	if ((!strcmp(cur->name, "Person")) && (cur->ns == ns))
				3959	ret->name = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				3960	if ((!strcmp(cur->name, "Email")) && (cur->ns == ns))
				3961	ret->email = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				3962	cur = cur->next;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3963	}
				3964
				3965	return(ret);
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3966	}</pre>
				3967
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3968	<p>Here are a couple of things to notice:</p>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3969	<ul>
Daniel Veillard	91e9d58	2001-02-26 07:31:12 +0000	[diff] [blame]	3970	<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]	3971	is by nature subject to repetitive constructs and usually exhibits highly
				3972	structured patterns.</li>
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	3973	<li>The two arguments of type <em>xmlDocPtr</em> and <em>xmlNsPtr</em>,
				3974	i.e. the pointer to the global XML document and the namespace reserved to
				3975	the application. Document wide information are needed for example to
				3976	decode entities and it's a good coding practice to define a namespace for
				3977	your application set of data and test that the element and attributes
				3978	you're analyzing actually pertains to your application space. This is
				3979	done by a simple equality test (cur->ns == ns).</li>
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	3980	<li>To retrieve text and attributes value, you can use the function
				3981	<em>xmlNodeListGetString</em> to gather all the text and entity reference
				3982	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]	3983	</ul>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	3984
				3985	<p>Here is another piece of code used to parse another level of the
				3986	structure:</p>
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	3987	<pre>#include <libxml/tree.h>
Daniel Veillard	361d845	2000-04-03 19:48:13 +0000	[diff] [blame]	3988	/*
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	3989	* a Description for a Job
				3990	*/
				3991	typedef struct job {
				3992	char *projectID;
				3993	char *application;
				3994	char *category;
				3995	personPtr contact;
				3996	int nbDevelopers;
				3997	personPtr developers[100]; /* using dynamic alloc is left as an exercise */
				3998	} job, *jobPtr;
				3999
				4000	/*
				4001	* And the code needed to parse it
				4002	*/
				4003	jobPtr parseJob(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
				4004	jobPtr ret = NULL;
				4005
				4006	DEBUG("parseJob\n");
				4007	/*
				4008	* allocate the struct
				4009	*/
				4010	ret = (jobPtr) malloc(sizeof(job));
				4011	if (ret == NULL) {
				4012	fprintf(stderr,"out of memory\n");
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4013	return(NULL);
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4014	}
				4015	memset(ret, 0, sizeof(job));
				4016
				4017	/* We don't care what the top level element name is */
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4018	cur = cur->xmlChildrenNode;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4019	while (cur != NULL) {
				4020
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4021	if ((!strcmp(cur->name, "Project")) && (cur->ns == ns)) {
				4022	ret->projectID = xmlGetProp(cur, "ID");
				4023	if (ret->projectID == NULL) {
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4024	fprintf(stderr, "Project has no ID\n");
				4025	}
				4026	}
Daniel Veillard	60979bd	2000-07-10 12:17:33 +0000	[diff] [blame]	4027	if ((!strcmp(cur->name, "Application")) && (cur->ns == ns))
				4028	ret->application = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4029	if ((!strcmp(cur->name, "Category")) && (cur->ns == ns))
				4030	ret->category = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
				4031	if ((!strcmp(cur->name, "Contact")) && (cur->ns == ns))
				4032	ret->contact = parsePerson(doc, ns, cur);
				4033	cur = cur->next;
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4034	}
				4035
				4036	return(ret);
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4037	}</pre>
Daniel Veillard	14fff06	1999-06-22 21:49:07 +0000	[diff] [blame]	4038
Daniel Veillard	ec70e91	2001-02-26 20:10:45 +0000	[diff] [blame]	4039	<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]	4040	boring. Ultimately, it could be possible to write stubbers taking either C
Daniel Veillard	3d6ae1c	2001-08-15 13:12:39 +0000	[diff] [blame]	4041	data structure definitions, a set of XML examples or an XML DTD and produce
				4042	the code needed to import and export the content between C data and XML
				4043	storage. This is left as an exercise to the reader :-)</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4044
Daniel Veillard	6f0adb5	2000-07-03 11:41:26 +0000	[diff] [blame]	4045	<p>Feel free to use <a href="example/gjobread.c">the code for the full C
				4046	parsing example</a> as a template, it is also available with Makefile in the
				4047	Gnome CVS base under gnome-xml/example</p>
Daniel Veillard	b05deb7	1999-08-10 19:04:08 +0000	[diff] [blame]	4048
Daniel Veillard	c310d56	2000-06-23 18:32:15 +0000	[diff] [blame]	4049	<h2><a name="Contributi">Contributions</a></h2>
				4050	<ul>
Daniel Veillard	b8cfbd1	2001-10-25 10:53:28 +0000	[diff] [blame]	4051	<li>Bjorn Reese, William Brack and Thomas Broyer have provided a number of
				4052	patches, Gary Pennington worked on the validation API, threading support
				4053	and Solaris port.</li>
				4054	<li>John Fleck helps maintaining the documentation and man pages.</li>
Daniel Veillard	7b4b2f9	2003-01-06 13:11:20 +0000	[diff] [blame]	4055	<li><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a> is now the
				4056	maintainer of the Windows port, <a
				4057	href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
				4058	binaries</a></li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4059	<li><a href="mailto:Gary.Pennington@sun.com">Gary Pennington</a> provides
				4060	<a href="http://garypennington.net/libxml2/">Solaris binaries</a></li>
Daniel Veillard	e356c28	2001-03-10 12:32:04 +0000	[diff] [blame]	4061	<li><a
				4062	href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
Daniel Veillard	63d8314	2002-05-20 06:51:05 +0000	[diff] [blame]	4063	Sergeant</a> developed <a
				4064	href="http://axkit.org/download/">XML::LibXSLT</a>, a Perl wrapper for
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4065	libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML
				4066	application server</a></li>
				4067	<li><a href="mailto:fnatter@gmx.net">Felix Natter</a> and <a
				4068	href="mailto:geertk@ai.rug.nl">Geert Kloosterman</a> provide <a
Daniel Veillard	ca98976	2001-06-23 17:39:29 +0000	[diff] [blame]	4069	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]	4070	documentation</li>
Daniel Veillard	af43f63	2002-03-08 15:05:20 +0000	[diff] [blame]	4071	<li><a href="mailto:sherwin@nlm.nih.gov">Ziying Sherwin</a> provided <a
				4072	href="http://xmlsoft.org/messages/0488.html">man pages</a></li>
Daniel Veillard	5168dbf	2001-07-07 00:18:23 +0000	[diff] [blame]	4073	<li>there is a module for <a
				4074	href="http://acs-misc.sourceforge.net/nsxml.html">libxml/libxslt support
				4075	in OpenNSD/AOLServer</a></li>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	4076	<li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provided the
				4077	first version of libxml/libxslt <a
				4078	href="http://www.rexx.com/~dkuhlman">wrappers for Python</a></li>
Daniel Veillard	1aadc44	2001-11-28 13:10:32 +0000	[diff] [blame]	4079	<li>Petr Kozelka provides <a
				4080	href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
				4081	libxml2</a> with Kylix and Delphi and other Pascal compilers</li>
Daniel Veillard	2d347fa	2002-03-17 10:34:11 +0000	[diff] [blame]	4082	<li><a href="mailto:aleksey@aleksey.com">Aleksey Sanin</a> implemented the
				4083	<a href="http://www.w3.org/Signature/">XML Canonicalization and XML
				4084	Digital Signature</a> <a
				4085	href="http://www.aleksey.com/xmlsec/">implementations for libxml2</a></li>
Daniel Veillard	17bed98	2003-02-24 20:11:43 +0000	[diff] [blame]	4086	<li><a href="mailto:Steve.Ball@zveno.com">Steve Ball</a>, <a
				4087	href="http://www.zveno.com/">Zveno</a> and contributors maintain <a
				4088	href="http://tclxml.sourceforge.net/">tcl bindings for libxml2 and
				4089	libxslt</a>, as well as <a
				4090	href="http://tclxml.sf.net/tkxmllint.html">tkxmllint</a> a GUI for
				4091	xmllint and <a href="http://tclxml.sf.net/tkxsltproc.html">tkxsltproc</a>
				4092	a GUI for xsltproc.</li>
Daniel Veillard	c310d56	2000-06-23 18:32:15 +0000	[diff] [blame]	4093	</ul>
				4094
Daniel Veillard	c8eab3a	1999-09-04 18:27:23 +0000	[diff] [blame]	4095	<p></p>
Daniel Veillard	ccb0963	1998-10-27 06:21:04 +0000	[diff] [blame]	4096	</body>
				4097	</html>