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Daniel Veillardccb09631998-10-27 06:21:04 +00001<html>
2<head>
Daniel Veillardec78c0f2000-08-25 10:25:23 +00003 <title>The XML C library for Gnome</title>
Daniel Veillard82687162001-01-22 15:32:01 +00004 <meta name="GENERATOR" content="amaya V4.1">
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Daniel Veillardccb09631998-10-27 06:21:04 +00006</head>
Daniel Veillardccb09631998-10-27 06:21:04 +00007
Daniel Veillardb05deb71999-08-10 19:04:08 +00008<body bgcolor="#ffffff">
Daniel Veillard60979bd2000-07-10 12:17:33 +00009<p><a href="http://www.gnome.org/"><img src="smallfootonly.gif"
10alt="Gnome Logo"></a><a href="http://www.w3.org/Status"><img src="w3c.png"
11alt="W3C Logo"></a></p>
Daniel Veillardec303412000-03-24 13:41:54 +000012
Daniel Veillardec78c0f2000-08-25 10:25:23 +000013<h1 align="center">The XML C library for Gnome</h1>
Daniel Veillardb05deb71999-08-10 19:04:08 +000014
Daniel Veillardc8eab3a1999-09-04 18:27:23 +000015<h2 style="text-align: center">libxml, a.k.a. gnome-xml</h2>
16
17<p></p>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +000018<ul>
19 <li><a href="#Introducti">Introduction</a></li>
20 <li><a href="#Documentat">Documentation</a></li>
Daniel Veillardd5f97f82000-09-17 16:38:14 +000021 <li><a href="#Reporting">Reporting bugs and getting help</a></li>
22 <li><a href="#help">how to help</a></li>
Daniel Veillard10a2c651999-12-12 13:03:50 +000023 <li><a href="#Downloads">Downloads</a></li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +000024 <li><a href="#News">News</a></li>
25 <li><a href="#XML">XML</a></li>
Daniel Veillard82687162001-01-22 15:32:01 +000026 <li><a href="#XSLT">XSLT</a></li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +000027 <li><a href="#tree">The tree output</a></li>
28 <li><a href="#interface">The SAX interface</a></li>
29 <li><a href="#library">The XML library interfaces</a>
30 <ul>
Daniel Veillard0142b842000-01-14 14:45:24 +000031 <li><a href="#Invoking">Invoking the parser: the pull way</a></li>
32 <li><a href="#Invoking">Invoking the parser: the push way</a></li>
33 <li><a href="#Invoking2">Invoking the parser: the SAX interface</a></li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +000034 <li><a href="#Building">Building a tree from scratch</a></li>
35 <li><a href="#Traversing">Traversing the tree</a></li>
36 <li><a href="#Modifying">Modifying the tree</a></li>
37 <li><a href="#Saving">Saving the tree</a></li>
38 <li><a href="#Compressio">Compression</a></li>
39 </ul>
40 </li>
41 <li><a href="#Entities">Entities or no entities</a></li>
42 <li><a href="#Namespaces">Namespaces</a></li>
43 <li><a href="#Validation">Validation</a></li>
44 <li><a href="#Principles">DOM principles</a></li>
45 <li><a href="#real">A real example</a></li>
Daniel Veillard96984452000-08-31 13:50:12 +000046 <li><a href="#Contributi">Contributions</a></li>
47</ul>
48
49<p>Separate documents:</p>
50<ul>
51 <li><a href="upgrade.html">upgrade instructions for migrating to
52 libxml2</a></li>
53 <li><a href="encoding.html">libxml Internationalization support</a></li>
54 <li><a href="xmlio.html">libxml Input/Output interfaces</a></li>
Daniel Veillard189446d2000-10-13 10:23:06 +000055 <li><a href="xmlmem.html">libxml Memory interfaces</a></li>
Daniel Veillard300f7d62000-11-24 13:04:04 +000056 <li><a href="xmldtd.html">a short introduction about DTDs and
57 libxml</a></li>
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +000058 <li><a href="http://xmlsoft.org/XSLT/">the libxslt page</a></li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +000059</ul>
60
61<h2><a name="Introducti">Introduction</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +000062
Daniel Veillardf13e1ed2000-03-06 07:41:49 +000063<p>This document describes libxml, the <a
Daniel Veillardec78c0f2000-08-25 10:25:23 +000064href="http://www.w3.org/XML/">XML</a> C library developped for the <a
65href="http://www.gnome.org/">Gnome</a> project. <a
66href="http://www.w3.org/XML/">XML is a standard</a> for building tag-based
67structured documents/data.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +000068
Daniel Veillard0142b842000-01-14 14:45:24 +000069<p>Here are some key points about libxml:</p>
70<ul>
Daniel Veillard189446d2000-10-13 10:23:06 +000071 <li>Libxml exports Push and Pull type parser interfaces for both XML and
72 HTML.</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +000073 <li>Libxml can do DTD validation at parse time, using a parsed document
74 instance, or with an arbitrary DTD.</li>
75 <li>Libxml now includes nearly complete <a
Daniel Veillard189446d2000-10-13 10:23:06 +000076 href="http://www.w3.org/TR/xpath">XPath</a> and <a
Daniel Veillard0c069222000-10-21 09:25:52 +000077 href="http://www.w3.org/TR/xptr">XPointer</a> implementations.</li>
Daniel Veillardec78c0f2000-08-25 10:25:23 +000078 <li>It is written in plain C, making as few assumptions as possible, and
Daniel Veillard189446d2000-10-13 10:23:06 +000079 sticking closely to ANSI C/POSIX for easy embedding. Works on
Daniel Veillardab8500d2000-10-15 21:06:19 +000080 Linux/Unix/Windows, ported to a number of other platforms.</li>
Daniel Veillardec70e912001-02-26 20:10:45 +000081 <li>Basic support for HTTP and FTP client allowing aplications to fetch
82 remote resources</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +000083 <li>The design is modular, most of the extensions can be compiled out.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +000084 <li>The internal document repesentation is as close as possible to the <a
85 href="http://www.w3.org/DOM/">DOM</a> interfaces.</li>
86 <li>Libxml also has a <a href="http://www.megginson.com/SAX/index.html">SAX
Daniel Veillard402e8c82000-02-29 22:57:47 +000087 like interface</a>; the interface is designed to be compatible with <a
88 href="http://www.jclark.com/xml/expat.html">Expat</a>.</li>
Daniel Veillardec303412000-03-24 13:41:54 +000089 <li>This library is released both under the <a
90 href="http://www.w3.org/Consortium/Legal/copyright-software-19980720.html">W3C
Daniel Veillard189446d2000-10-13 10:23:06 +000091 IPR</a> and the <a href="http://www.gnu.org/copyleft/lesser.html">GNU
92 LGPL</a>. Use either at your convenience, basically this should make
93 everybody happy, if not, drop me a mail.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +000094</ul>
Daniel Veillardccb09631998-10-27 06:21:04 +000095
Daniel Veillarde0c1d722001-03-21 10:28:36 +000096<p>Warning: unless you are forced to because your application links with a
97Gnome library requiring it, <strong><span
98style="background-color: #FF0000">Do Not Use libxml1</span></strong>, use
99libxml2</p>
100
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000101<h2><a name="Documentat">Documentation</a></h2>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000102
Daniel Veillard402e8c82000-02-29 22:57:47 +0000103<p>There are some on-line resources about using libxml:</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000104<ol>
Daniel Veillard365e13b2000-07-02 07:56:37 +0000105 <li>Check the <a href="FAQ.html">FAQ</a></li>
Daniel Veillardc19fccc2000-07-03 11:52:01 +0000106 <li>Check the <a href="http://xmlsoft.org/html/libxml-lib.html">extensive
Daniel Veillard8c6d6af2000-08-25 17:14:13 +0000107 documentation</a> automatically extracted from code comments (using <a
108 href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&amp;dir=gtk-doc">gtk
109 doc</a>).</li>
Daniel Veillard8d869642000-07-14 12:12:59 +0000110 <li>Look at the documentation about <a href="encoding.html">libxml
111 internationalization support</a></li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000112 <li>This page provides a global overview and <a href="#real">some
Daniel Veillard402e8c82000-02-29 22:57:47 +0000113 examples</a> on how to use libxml.</li>
114 <li><a href="mailto:james@daa.com.au">James Henstridge</a> wrote <a
115 href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">some nice
116 documentation</a> explaining how to use the libxml SAX interface.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000117 <li>George Lebl wrote <a
118 href="http://www-4.ibm.com/software/developer/library/gnome3/">an article
Daniel Veillard402e8c82000-02-29 22:57:47 +0000119 for IBM developerWorks</a> about using libxml.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000120 <li>It is also a good idea to check to <a href="mailto:raph@levien.com">Raph
Daniel Veillard91e9d582001-02-26 07:31:12 +0000121 Levien</a>'s <a href="http://levien.com/gnome/">web site</a> since he is
Daniel Veillard0142b842000-01-14 14:45:24 +0000122 building the <a href="http://levien.com/gnome/gdome.html">DOM interface
Daniel Veillard402e8c82000-02-29 22:57:47 +0000123 gdome</a> on top of libxml result tree and an implementation of <a
Daniel Veillard0142b842000-01-14 14:45:24 +0000124 href="http://www.w3.org/Graphics/SVG/">SVG</a> called <a
125 href="http://www.levien.com/svg/">gill</a>. Check his <a
126 href="http://www.levien.com/gnome/domination.html">DOMination
127 paper</a>.</li>
Daniel Veillardec303412000-03-24 13:41:54 +0000128 <li>Check <a href="http://cvs.gnome.org/lxr/source/gnome-xml/TODO">the TODO
129 file</a></li>
130 <li>Read the <a href="upgrade.html">1.x to 2.x upgrade path</a>. If you are
131 starting a new project using libxml you should really use the 2.x
132 version.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000133 <li>And don't forget to look at the <a href="/messages/">mailing-list
Daniel Veillardc310d562000-06-23 18:32:15 +0000134 archive</a>.</li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000135</ol>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000136
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000137<h2><a name="Reporting">Reporting bugs and getting help</a></h2>
Daniel Veillard4c3a2031999-11-19 17:46:26 +0000138
Daniel Veillard402e8c82000-02-29 22:57:47 +0000139<p>Well, bugs or missing features are always possible, and I will make a point
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000140of fixing them in a timely fashion. The best way to report a bug is to use the
Daniel Veillard81781102001-03-07 09:31:47 +0000141<a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">Gnome bug
142tracking database</a> (make sure to use the "libxml" module name). I look at
143reports there regularly and it's good to have a reminder when a bug is still
Daniel Veillarda41123c2001-04-22 19:31:20 +0000144open. Check the <a
145href="http://bugzilla.gnome.org/bugwritinghelp.html">instructions on reporting
146bugs</a> and be sure to specify that the bug is for the package libxml.</p>
Daniel Veillard4c3a2031999-11-19 17:46:26 +0000147
Daniel Veillard0142b842000-01-14 14:45:24 +0000148<p>There is also a mailing-list <a
Daniel Veillard3197f162001-04-04 00:40:08 +0000149href="mailto:xml@gnome.org">xml@gnome.org</a> for libxml, with an <a
150href="http://mail.gnome.org/archives/xml/">on-line archive</a> (<a
151href="http://xmlsoft.org/messages">old</a>). To subscribe to this list, please
152visit the <a href="http://mail.gnome.org/mailman/listinfo/xml">associated
153Web</a> page and follow the instructions.</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000154
Daniel Veillard402e8c82000-02-29 22:57:47 +0000155<p>Alternatively, you can just send the bug to the <a
Daniel Veillard33a67802001-03-07 09:44:02 +0000156href="mailto:xml@gnome.org">xml@gnome.org</a> list; if it's really libxml
Daniel Veillardf121ab72000-08-29 23:40:42 +0000157related I will approve it..</p>
Daniel Veillard4c3a2031999-11-19 17:46:26 +0000158
Daniel Veillard91e9d582001-02-26 07:31:12 +0000159<p>Of course, bugs reported with a suggested patch for fixing them will
Daniel Veillardec303412000-03-24 13:41:54 +0000160probably be processed faster.</p>
161
162<p>If you're looking for help, a quick look at <a
163href="http://xmlsoft.org/messages/#407">the list archive</a> may actually
164provide the answer, I usually send source samples when answering libxml usage
Daniel Veillard6f0adb52000-07-03 11:41:26 +0000165questions. The <a href="http://xmlsoft.org/html/book1.html">auto-generated
Daniel Veillardec303412000-03-24 13:41:54 +0000166documentantion</a> is not as polished as I would like (i need to learn more
167about Docbook), but it's a good starting point.</p>
168
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000169<h2><a name="help">How to help</a></h2>
170
171<p>You can help the project in various ways, the best thing to do first is to
172subscribe to the mailing-list as explained before, check the <a
173href="http://xmlsoft.org/messages/">archives </a>and the <a
174href="http://bugs.gnome.org/db/pa/lgnome-xml.html">Gnome bug
175database:</a>:</p>
176<ol>
177 <li>provide patches when you find problems</li>
Daniel Veillard189446d2000-10-13 10:23:06 +0000178 <li>provide the diffs when you port libxml to a new platform. They may not
Daniel Veillardab8500d2000-10-15 21:06:19 +0000179 be integrated in all cases but help pinpointing portability problems
180 and</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000181 <li>provide documentation fixes (either as patches to the code comments or
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000182 as HTML diffs).</li>
183 <li>provide new documentations pieces (translations, examples, etc ...)</li>
184 <li>Check the TODO file and try to close one of the items</li>
185 <li>take one of the points raised in the archive or the bug database and
Daniel Veillard33a67802001-03-07 09:44:02 +0000186 provide a fix. <a href="mailto:Daniel.Veillard@imag.fr">Get in touch with
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000187 me </a>before to avoid synchronization problems and check that the
188 suggested fix will fit in nicely :-)</li>
189</ol>
190
Daniel Veillard10a2c651999-12-12 13:03:50 +0000191<h2><a name="Downloads">Downloads</a></h2>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000192
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000193<p>The latest versions of libxml can be found on <a
Daniel Veillard33a67802001-03-07 09:44:02 +0000194href="ftp://xmlsoft.org/">xmlsoft.org</a> or on the <a
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000195href="ftp://ftp.gnome.org/pub/GNOME/MIRRORS.html">Gnome FTP server</a> either
Daniel Veillard10a2c651999-12-12 13:03:50 +0000196as a <a href="ftp://ftp.gnome.org/pub/GNOME/stable/sources/libxml/">source
Daniel Veillard306be992000-07-03 12:38:45 +0000197archive</a> or <a
Daniel Veillarda41123c2001-04-22 19:31:20 +0000198href="ftp://ftp.gnome.org/pub/GNOME/stable/redhat/i386/libxml/">RPM
199packages</a>. (NOTE that you need both the <a
Daniel Veillardc19fccc2000-07-03 11:52:01 +0000200href="http://rpmfind.net/linux/RPM/libxml2.html">libxml(2)</a> and <a
201href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml(2)-devel</a>
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000202packages installed to compile applications using libxml.)</p>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000203
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000204<p><a name="Snapshot">Snapshot:</a></p>
205<ul>
206 <li>Code from the W3C cvs base libxml <a
Daniel Veillard33a67802001-03-07 09:44:02 +0000207 href="ftp://xmlsoft.org/cvs-snapshot.tar.gz">cvs-snapshot.tar.gz</a></li>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000208 <li>Docs, content of the web site, the list archive included <a
Daniel Veillard33a67802001-03-07 09:44:02 +0000209 href="ftp://xmlsoft.org/libxml-docs.tar.gz">libxml-docs.tar.gz</a></li>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000210</ul>
211
212<p><a name="Contribs">Contribs:</a></p>
213
214<p>I do accept external contributions, especially if compiling on another
215platform, get in touch with me to upload the package. I will keep them in the
Daniel Veillard33a67802001-03-07 09:44:02 +0000216<a href="ftp://xmlsoft.org/contribs/">contrib directory</a></p>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000217
Daniel Veillard82687162001-01-22 15:32:01 +0000218<p>Libxml is also available from CVS:</p>
Daniel Veillard10a2c651999-12-12 13:03:50 +0000219<ul>
Daniel Veillard10a2c651999-12-12 13:03:50 +0000220 <li><p>The <a
221 href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&amp;dir=gnome-xml">Gnome
Daniel Veillard402e8c82000-02-29 22:57:47 +0000222 CVS base</a>. Check the <a
223 href="http://developer.gnome.org/tools/cvs.html">Gnome CVS Tools</a> page;
224 the CVS module is <b>gnome-xml</b>.</p>
Daniel Veillard10a2c651999-12-12 13:03:50 +0000225 </li>
Daniel Veillard82687162001-01-22 15:32:01 +0000226 <li>The <strong>libxslt</strong> module is also present there</li>
Daniel Veillard10a2c651999-12-12 13:03:50 +0000227</ul>
228
229<h2><a name="News">News</a></h2>
230
Daniel Veillard944b5ff1999-12-15 19:08:24 +0000231<h3>CVS only : check the <a
232href="http://cvs.gnome.org/lxr/source/gnome-xml/ChangeLog">Changelog</a> file
Daniel Veillard189446d2000-10-13 10:23:06 +0000233for a really accurate description</h3>
Daniel Veillardab8500d2000-10-15 21:06:19 +0000234
Daniel Veillard91e9d582001-02-26 07:31:12 +0000235<p>Items floating around but not actively worked on, get in touch with me if
Daniel Veillardab8500d2000-10-15 21:06:19 +0000236you want to test those</p>
237<ul>
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +0000238 <li>Implementing <a href="http://xmlsoft.org/XSLT">XSLT</a>, this is done as
239 a separate C library on top of libxml called libxslt, not released yet but
240 available from CVS</li>
Daniel Veillard28929b22000-11-13 18:22:49 +0000241 <li>Finishing up <a href="http://www.w3.org/TR/xptr">XPointer</a> and <a
242 href="http://www.w3.org/TR/xinclude">XInclude</a></li>
Daniel Veillard82687162001-01-22 15:32:01 +0000243 <li>(seeems working but delayed from release) parsing/import of Docbook SGML
244 docs</li>
Daniel Veillardab8500d2000-10-15 21:06:19 +0000245</ul>
246
Daniel Veillard4623acd2001-05-19 15:13:15 +0000247<h3>2.3.9: May 19 2001</h3>
248
249<p>Lots of bugfixes, and added a basic SGML catalog support:</p>
250<ul>
251 <li>HTML push bugfix #54891 and another patch from Jonas Borgström</li>
252 <li>some serious speed optimisation again</li>
253 <li>some documentation cleanups</li>
254 <li>trying to get better linking on solaris (-R)</li>
255 <li>XPath API cleanup from Thomas Broyer</li>
256 <li>Validation bug fixed #54631, added a patch from Gary Pennington, fixed
257 xmlValidGetValidElements()</li>
258 <li>Added an INSTALL file</li>
259 <li>Attribute removal added to API: #54433</li>
260 <li>added a basic support for SGML catalogs</li>
261 <li>fixed xmlKeepBlanksDefault(0) API</li>
262 <li>bugfix in xmlNodeGetLang()</li>
263 <li>fixed a small configure portability problem</li>
264 <li>fixed an inversion of SYSTEM and PUBLIC identifier in HTML document</li>
265</ul>
266
Daniel Veillarda265af72001-05-14 11:13:58 +0000267<h3>1.8.13: May 14 2001</h3>
268<ul>
269 <li>bugfixes release of the old libxml1 branch used by Gnome</li>
270</ul>
271
Daniel Veillard3bbbe6f2001-05-03 11:15:37 +0000272<h3>2.3.8: May 3 2001</h3>
273<ul>
274 <li>Integrated an SGML DocBook parser for the Gnome project</li>
275 <li>Fixed a few things in the HTML parser</li>
276 <li>Fixed some XPath bugs raised by XSLT use, tried to fix the floating
277 point portability issue</li>
278 <li>Speed improvement (8M/s for SAX, 3M/s for DOM, 1.5M/s for DOM+validation
279 using the XML REC as input and a 700MHz celeron).</li>
280 <li>incorporated more Windows cleanup</li>
281 <li>added xmlSaveFormatFile()</li>
282 <li>fixed problems in copying nodes with entities references (gdome)</li>
283 <li>removed some troubles surrounding the new validation module</li>
284</ul>
285
Daniel Veillarda41123c2001-04-22 19:31:20 +0000286<h3>2.3.7: April 22 2001</h3>
287<ul>
288 <li>lots of small bug fixes, corrected XPointer</li>
289 <li>Non determinist content model validation support</li>
290 <li>added xmlDocCopyNode for gdome2</li>
291 <li>revamped the way the HTML parser handles end of tags</li>
292 <li>XPath: corrctions of namespacessupport and number formatting</li>
293 <li>Windows: Igor Zlatkovic patches for MSC compilation</li>
294 <li>HTML ouput fixes from P C Chow and William M. Brack</li>
295 <li>Improved validation speed sensible for DocBook</li>
296 <li>fixed a big bug with ID declared in external parsed entities</li>
297 <li>portability fixes, update of Trio from Bjorn Reese</li>
298</ul>
299
Daniel Veillardafc73112001-04-11 11:51:41 +0000300<h3>2.3.6: April 8 2001</h3>
301<ul>
302 <li>Code cleanup using extreme gcc compiler warning options, found and
303 cleared half a dozen potential problem</li>
304 <li>the Eazel team found an XML parser bug</li>
305 <li>cleaned up the user of some of the string formatting function. used the
306 trio library code to provide the one needed when the platform is missing
307 them</li>
308 <li>xpath: removed a memory leak and fixed the predicate evaluation problem,
309 extended the testsuite and cleaned up the result. XPointer seems broken
310 ...</li>
311</ul>
312
Daniel Veillard56a4cb82001-03-24 17:00:36 +0000313<h3>2.3.5: Mar 23 2001</h3>
314<ul>
315 <li>Biggest change is separate parsing and evaluation of XPath expressions,
316 there is some new APIs for this too</li>
317 <li>included a number of bug fixes(XML push parser, 51876, notations,
318 52299)</li>
319 <li>Fixed some portability issues</li>
320</ul>
321
Daniel Veillarde356c282001-03-10 12:32:04 +0000322<h3>2.3.4: Mar 10 2001</h3>
323<ul>
324 <li>Fixed bugs #51860 and #51861</li>
325 <li>Added a global variable xmlDefaultBufferSize to allow default buffer
326 size to be application tunable.</li>
327 <li>Some cleanup in the validation code, still a bug left and this part
328 should probably be rewritten to support ambiguous content model :-\</li>
329 <li>Fix a couple of serious bugs introduced or raised by changes in 2.3.3
330 parser</li>
331 <li>Fixed another bug in xmlNodeGetContent()</li>
332 <li>Bjorn fixed XPath node collection and Number formatting</li>
333 <li>Fixed a loop reported in the HTML parsing</li>
334 <li>blank space are reported even if the Dtd content model proves that they
335 are formatting spaces, this is for XmL conformance</li>
336</ul>
337
Daniel Veillardb402c072001-03-01 17:28:58 +0000338<h3>2.3.3: Mar 1 2001</h3>
339<ul>
340 <li>small change in XPath for XSLT</li>
341 <li>documentation cleanups</li>
342 <li>fix in validation by Gary Pennington</li>
343 <li>serious parsing performances improvements</li>
344</ul>
345
Daniel Veillardec70e912001-02-26 20:10:45 +0000346<h3>2.3.2: Feb 24 2001</h3>
Daniel Veillard71681102001-02-24 17:48:53 +0000347<ul>
348 <li>chasing XPath bugs, found a bunch, completed some TODO</li>
349 <li>fixed a Dtd parsing bug</li>
350 <li>fixed a bug in xmlNodeGetContent</li>
351 <li>ID/IDREF support partly rewritten by Gary Pennington</li>
352</ul>
353
Daniel Veillardec70e912001-02-26 20:10:45 +0000354<h3>2.3.1: Feb 15 2001</h3>
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +0000355<ul>
356 <li>some XPath and HTML bug fixes for XSLT</li>
357 <li>small extension of the hash table interfaces for DOM gdome2
358 implementation</li>
359 <li>A few bug fixes</li>
360</ul>
361
Daniel Veillardec70e912001-02-26 20:10:45 +0000362<h3>2.3.0: Feb 8 2001 (2.2.12 was on 25 Jan but I didn't kept track)</h3>
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +0000363<ul>
364 <li>Lots of XPath bug fixes</li>
365 <li>Add a mode with Dtd lookup but without validation error reporting for
366 XSLT</li>
367 <li>Add support for text node without escaping (XSLT)</li>
368 <li>bug fixes for xmlCheckFilename</li>
369 <li>validation code bug fixes from Gary Pennington</li>
370 <li>Patch from Paul D. Smith correcting URI path normalization</li>
371 <li>Patch to allow simultaneous install of libxml-devel and
372 libxml2-devel</li>
373 <li>the example Makefile is now fixed</li>
374 <li>added HTML to the RPM packages</li>
375 <li>tree copying bugfixes</li>
376 <li>updates to Windows makefiles</li>
377 <li>optimisation patch from Bjorn Reese</li>
378</ul>
379
Daniel Veillardec70e912001-02-26 20:10:45 +0000380<h3>2.2.11: Jan 4 2001</h3>
Daniel Veillard503b8932001-01-05 06:36:31 +0000381<ul>
382 <li>bunch of bug fixes (memory I/O, xpath, ftp/http, ...)</li>
383 <li>added htmlHandleOmittedElem()</li>
384 <li>Applied Bjorn Reese's IPV6 first patch</li>
385 <li>Applied Paul D. Smith patches for validation of XInclude results</li>
Daniel Veillard82687162001-01-22 15:32:01 +0000386 <li>added XPointer xmlns() new scheme support</li>
Daniel Veillard503b8932001-01-05 06:36:31 +0000387</ul>
388
Daniel Veillard2ddd23d2000-11-25 10:42:19 +0000389<h3>2.2.10: Nov 25 2000</h3>
Daniel Veillard9d343c42000-11-25 10:12:43 +0000390<ul>
391 <li>Fix the Windows problems of 2.2.8</li>
392 <li>integrate OpenVMS patches</li>
393 <li>better handling of some nasty HTML input</li>
394 <li>Improved the XPointer implementation</li>
395 <li>integrate a number of provided patches</li>
396</ul>
397
Daniel Veillard2ddd23d2000-11-25 10:42:19 +0000398<h3>2.2.9: Nov 25 2000</h3>
399<ul>
400 <li>erroneous release :-(</li>
401</ul>
402
Daniel Veillard28929b22000-11-13 18:22:49 +0000403<h3>2.2.8: Nov 13 2000</h3>
404<ul>
405 <li>First version of <a href="http://www.w3.org/TR/xinclude">XInclude</a>
406 support</li>
407 <li>Patch in conditional section handling</li>
408 <li>updated MS compiler project</li>
409 <li>fixed some XPath problems</li>
410 <li>added an URI escaping function</li>
411 <li>some other bug fixes</li>
412</ul>
413
414<h3>2.2.7: Oct 31 2000</h3>
415<ul>
416 <li>added message redirection</li>
417 <li>XPath improvements (thanks TOM !)</li>
418 <li>xmlIOParseDTD() added</li>
419 <li>various small fixes in the HTML, URI, HTTP and XPointer support</li>
420 <li>some cleanup of the Makefile, autoconf and the distribution content</li>
421</ul>
422
Daniel Veillard29a11cc2000-10-25 13:32:39 +0000423<h3>2.2.6: Oct 25 2000:</h3>
424<ul>
425 <li>Added an hash table module, migrated a number of internal structure to
426 those</li>
427 <li>Fixed a posteriori validation problems</li>
428 <li>HTTP module cleanups</li>
429 <li>HTML parser improvements (tag errors, script/style handling, attribute
430 normalization)</li>
431 <li>coalescing of adjacent text nodes</li>
432 <li>couple of XPath bug fixes, exported the internal API</li>
433</ul>
434
Daniel Veillardab8500d2000-10-15 21:06:19 +0000435<h3>2.2.5: Oct 15 2000:</h3>
Daniel Veillard4c3a2031999-11-19 17:46:26 +0000436<ul>
Daniel Veillard189446d2000-10-13 10:23:06 +0000437 <li>XPointer implementation and testsuite</li>
438 <li>Lot of XPath fixes, added variable and functions registration, more
439 tests</li>
440 <li>Portability fixes, lots of enhancements toward an easy Windows build and
441 release</li>
442 <li>Late validation fixes</li>
443 <li>Integrated a lot of contributed patches</li>
444 <li>added memory management docs</li>
Daniel Veillardab8500d2000-10-15 21:06:19 +0000445 <li>a performance problem when using large buffer seems fixed</li>
Daniel Veillard189446d2000-10-13 10:23:06 +0000446</ul>
447
448<h3>2.2.4: Oct 1 2000:</h3>
449<ul>
450 <li>main XPath problem fixed</li>
451 <li>Integrated portability patches for Windows</li>
452 <li>Serious bug fixes on the URI and HTML code</li>
Daniel Veillard361d8452000-04-03 19:48:13 +0000453</ul>
454
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000455<h3>2.2.3: Sep 17 2000</h3>
456<ul>
457 <li>bug fixes</li>
458 <li>cleanup of entity handling code</li>
459 <li>overall review of all loops in the parsers, all sprintf usage has been
460 checked too</li>
461 <li>Far better handling of larges Dtd. Validating against Docbook XML Dtd
462 works smoothly now.</li>
463</ul>
464
465<h3>1.8.10: Sep 6 2000</h3>
466<ul>
467 <li>bug fix release for some Gnome projects</li>
468</ul>
469
470<h3>2.2.2: August 12 2000</h3>
Daniel Veillard786d7c82000-08-12 23:38:57 +0000471<ul>
472 <li>mostly bug fixes</li>
Daniel Veillardec78c0f2000-08-25 10:25:23 +0000473 <li>started adding routines to access xml parser context options</li>
Daniel Veillard786d7c82000-08-12 23:38:57 +0000474</ul>
475
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000476<h3>2.2.1: July 21 2000</h3>
Daniel Veillarda2679fa2000-07-22 02:38:15 +0000477<ul>
478 <li>a purely bug fixes release</li>
479 <li>fixed an encoding support problem when parsing from a memory block</li>
480 <li>fixed a DOCTYPE parsing problem</li>
481 <li>removed a bug in the function allowing to override the memory allocation
482 routines</li>
483</ul>
484
Daniel Veillardd5f97f82000-09-17 16:38:14 +0000485<h3>2.2.0: July 14 2000</h3>
Daniel Veillard94e90602000-07-17 14:38:19 +0000486<ul>
487 <li>applied a lot of portability fixes</li>
488 <li>better encoding support/cleanup and saving (content is now always
489 encoded in UTF-8)</li>
490 <li>the HTML parser now correctly handles encodings</li>
491 <li>added xmlHasProp()</li>
492 <li>fixed a serious problem with &amp;#38;</li>
493 <li>propagated the fix to FTP client</li>
494 <li>cleanup, bugfixes, etc ...</li>
495 <li>Added a page about <a href="encoding.html">libxml Internationalization
496 support</a></li>
497</ul>
498
Daniel Veillard60979bd2000-07-10 12:17:33 +0000499<h3>1.8.9: July 9 2000</h3>
500<ul>
501 <li>fixed the spec the RPMs should be better</li>
502 <li>fixed a serious bug in the FTP implementation, released 1.8.9 to solve
503 rpmfind users problem</li>
504</ul>
505
Daniel Veillard6388e172000-07-03 16:07:19 +0000506<h3>2.1.1: July 1 2000</h3>
507<ul>
508 <li>fixes a couple of bugs in the 2.1.0 packaging</li>
509 <li>improvements on the HTML parser</li>
510</ul>
511
Daniel Veillard3f6f7f62000-06-30 17:58:25 +0000512<h3>2.1.0 and 1.8.8: June 29 2000</h3>
513<ul>
514 <li>1.8.8 is mostly a comodity package for upgrading to libxml2 accoding to
515 <a href="upgrade.html">new instructions</a>. It fixes a nasty problem
516 about &amp;#38; charref parsing</li>
517 <li>2.1.0 also ease the upgrade from libxml v1 to the recent version. it
518 also contains numerous fixes and enhancements:
519 <ul>
520 <li>added xmlStopParser() to stop parsing</li>
521 <li>improved a lot parsing speed when there is large CDATA blocs</li>
522 <li>includes XPath patches provided by Picdar Technology</li>
523 <li>tried to fix as much as possible DtD validation and namespace
524 related problems</li>
525 <li>output to a given encoding has been added/tested</li>
526 <li>lot of various fixes</li>
527 </ul>
528 </li>
529</ul>
530
Daniel Veillarde0aed302000-04-16 08:52:20 +0000531<h3>2.0.0: Apr 12 2000</h3>
Daniel Veillard361d8452000-04-03 19:48:13 +0000532<ul>
533 <li>First public release of libxml2. If you are using libxml, it's a good
Daniel Veillarde0aed302000-04-16 08:52:20 +0000534 idea to check the 1.x to 2.x upgrade instructions. NOTE: while initally
535 scheduled for Apr 3 the relase occured only on Apr 12 due to massive
536 workload.</li>
Daniel Veillard361d8452000-04-03 19:48:13 +0000537 <li>The include are now located under $prefix/include/libxml (instead of
Daniel Veillarde0aed302000-04-16 08:52:20 +0000538 $prefix/include/gnome-xml), they also are referenced by
Daniel Veillard60979bd2000-07-10 12:17:33 +0000539 <pre>#include &lt;libxml/xxx.h&gt;</pre>
Daniel Veillarde0aed302000-04-16 08:52:20 +0000540 <p>instead of</p>
Daniel Veillard361d8452000-04-03 19:48:13 +0000541 <pre>#include "xxx.h"</pre>
542 </li>
Daniel Veillard8f621982000-03-20 13:07:15 +0000543 <li>a new URI module for parsing URIs and following strictly RFC 2396</li>
544 <li>the memory allocation routines used by libxml can now be overloaded
545 dynamically by using xmlMemSetup()</li>
Daniel Veillard361d8452000-04-03 19:48:13 +0000546 <li>The previously CVS only tool tester has been renamed
547 <strong>xmllint</strong> and is now installed as part of the libxml2
548 package</li>
Daniel Veillarde0aed302000-04-16 08:52:20 +0000549 <li>The I/O interface has been revamped. There is now ways to plug in
550 specific I/O modules, either at the URI scheme detection level using
551 xmlRegisterInputCallbacks() or by passing I/O functions when creating a
552 parser context using xmlCreateIOParserCtxt()</li>
553 <li>there is a C preprocessor macro LIBXML_VERSION providing the version
554 number of the libxml module in use</li>
555 <li>a number of optional features of libxml can now be excluded at configure
556 time (FTP/HTTP/HTML/XPath/Debug)</li>
Daniel Veillardedfb29b2000-03-14 19:59:05 +0000557</ul>
558
559<h3>2.0.0beta: Mar 14 2000</h3>
560<ul>
561 <li>This is a first Beta release of libxml version 2</li>
Daniel Veillarde356c282001-03-10 12:32:04 +0000562 <li>It's available only from<a href="ftp://xmlsoft.org/">xmlsoft.org
563 FTP</a>, it's packaged as libxml2-2.0.0beta and available as tar and
564 RPMs</li>
Daniel Veillardedfb29b2000-03-14 19:59:05 +0000565 <li>This version is now the head in the Gnome CVS base, the old one is
566 available under the tag LIB_XML_1_X</li>
567 <li>This includes a very large set of changes. Froma programmatic point of
568 view applications should not have to be modified too much, check the <a
569 href="upgrade.html">upgrade page</a></li>
570 <li>Some interfaces may changes (especially a bit about encoding).</li>
571 <li>the updates includes:
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000572 <ul>
Daniel Veillardedfb29b2000-03-14 19:59:05 +0000573 <li>fix I18N support. ISO-Latin-x/UTF-8/UTF-16 (nearly) seems correctly
574 handled now</li>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000575 <li>Better handling of entities, especially well formedness checking and
576 proper PEref extensions in external subsets</li>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000577 <li>DTD conditional sections</li>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000578 <li>Validation now correcly handle entities content</li>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000579 <li><a href="http://rpmfind.net/tools/gdome/messages/0039.html">change
580 structures to accomodate DOM</a></li>
Daniel Veillard6c8b1172000-03-01 00:40:41 +0000581 </ul>
582 </li>
Daniel Veillardedfb29b2000-03-14 19:59:05 +0000583 <li>Serious progress were made toward compliance, <a
584 href="conf/result.html">here are the result of the test</a> against the
585 OASIS testsuite (except the japanese tests since I don't support that
586 encoding yet). This URL is rebuilt every couple of hours using the CVS
587 head version.</li>
Daniel Veillarde41f2b72000-01-30 20:00:07 +0000588</ul>
589
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000590<h3>1.8.7: Mar 6 2000</h3>
591<ul>
592 <li>This is a bug fix release:</li>
593 <li>It is possible to disable the ignorable blanks heuristic used by
594 libxml-1.x, a new function xmlKeepBlanksDefault(0) will allow this. Note
595 that for adherence to XML spec, this behaviour will be disabled by default
596 in 2.x . The same function will allow to keep compatibility for old
597 code.</li>
Daniel Veillard60979bd2000-07-10 12:17:33 +0000598 <li>Blanks in &lt;a&gt; &lt;/a&gt; constructs are not ignored anymore,
599 avoiding heuristic is really the Right Way :-\</li>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000600 <li>The unchecked use of snprintf which was breaking libxml-1.8.6
601 compilation on some platforms has been fixed</li>
602 <li>nanoftp.c nanohttp.c: Fixed '#' and '?' stripping when processing
603 URIs</li>
604</ul>
605
Daniel Veillarde41f2b72000-01-30 20:00:07 +0000606<h3>1.8.6: Jan 31 2000</h3>
607<ul>
608 <li>added a nanoFTP transport module, debugged until the new version of <a
609 href="http://rpmfind.net/linux/rpm2html/rpmfind.html">rpmfind</a> can use
610 it without troubles</li>
Daniel Veillardda07c342000-01-25 18:31:22 +0000611</ul>
612
613<h3>1.8.5: Jan 21 2000</h3>
614<ul>
Daniel Veillard0142b842000-01-14 14:45:24 +0000615 <li>adding APIs to parse a well balanced chunk of XML (production <a
616 href="http://www.w3.org/TR/REC-xml#NT-content">[43] content</a> of the XML
617 spec)</li>
Daniel Veillard461a66c2000-01-18 18:01:01 +0000618 <li>fixed a hideous bug in xmlGetProp pointed by Rune.Djurhuus@fast.no</li>
Daniel Veillard60979bd2000-07-10 12:17:33 +0000619 <li>Jody Goldberg &lt;jgoldberg@home.com&gt; provided another patch trying
620 to solve the zlib checks problems</li>
Daniel Veillard461a66c2000-01-18 18:01:01 +0000621 <li>The current state in gnome CVS base is expected to ship as 1.8.5 with
622 gnumeric soon</li>
Daniel Veillard0142b842000-01-14 14:45:24 +0000623</ul>
624
625<h3>1.8.4: Jan 13 2000</h3>
626<ul>
627 <li>bug fixes, reintroduced xmlNewGlobalNs(), fixed xmlNewNs()</li>
628 <li>all exit() call should have been removed from libxml</li>
629 <li>fixed a problem with INCLUDE_WINSOCK on WIN32 platform</li>
630 <li>added newDocFragment()</li>
Daniel Veillardf84f71f2000-01-05 19:54:23 +0000631</ul>
632
633<h3>1.8.3: Jan 5 2000</h3>
634<ul>
635 <li>a Push interface for the XML and HTML parsers</li>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000636 <li>a shell-like interface to the document tree (try tester --shell :-)</li>
Daniel Veillarddbfd6411999-12-28 16:35:14 +0000637 <li>lots of bug fixes and improvement added over XMas hollidays</li>
Daniel Veillard437b87b2000-01-03 17:30:46 +0000638 <li>fixed the DTD parsing code to work with the xhtml DTD</li>
Daniel Veillardf84f71f2000-01-05 19:54:23 +0000639 <li>added xmlRemoveProp(), xmlRemoveID() and xmlRemoveRef()</li>
640 <li>Fixed bugs in xmlNewNs()</li>
Daniel Veillard437b87b2000-01-03 17:30:46 +0000641 <li>External entity loading code has been revamped, now it uses
Daniel Veillardf84f71f2000-01-05 19:54:23 +0000642 xmlLoadExternalEntity(), some fix on entities processing were added</li>
Daniel Veillard437b87b2000-01-03 17:30:46 +0000643 <li>cleaned up WIN32 includes of socket stuff</li>
Daniel Veillard5cb5ab81999-12-21 15:35:29 +0000644</ul>
645
646<h3>1.8.2: Dec 21 1999</h3>
647<ul>
Daniel Veillardb24054a1999-12-18 15:32:46 +0000648 <li>I got another problem with includes and C++, I hope this issue is fixed
649 for good this time</li>
Daniel Veillard5cb5ab81999-12-21 15:35:29 +0000650 <li>Added a few tree modification functions: xmlReplaceNode,
651 xmlAddPrevSibling, xmlAddNextSibling, xmlNodeSetName and
652 xmlDocSetRootElement</li>
653 <li>Tried to improve the HTML output with help from <a
654 href="mailto:clahey@umich.edu">Chris Lahey</a></li>
Daniel Veillarde4e51311999-12-18 15:32:46 +0000655</ul>
Daniel Veillardb24054a1999-12-18 15:32:46 +0000656
Daniel Veillarde4e51311999-12-18 15:32:46 +0000657<h3>1.8.1: Dec 18 1999</h3>
658<ul>
659 <li>various patches to avoid troubles when using libxml with C++ compilers
660 the "namespace" keyword and C escaping in include files</li>
661 <li>a problem in one of the core macros IS_CHAR was corrected</li>
662 <li>fixed a bug introduced in 1.8.0 breaking default namespace processing,
663 and more specifically the Dia application</li>
Daniel Veillard944b5ff1999-12-15 19:08:24 +0000664 <li>fixed a posteriori validation (validation after parsing, or by using a
665 Dtd not specified in the original document)</li>
Daniel Veillardb24054a1999-12-18 15:32:46 +0000666 <li>fixed a bug in</li>
Daniel Veillard10a2c651999-12-12 13:03:50 +0000667</ul>
668
669<h3>1.8.0: Dec 12 1999</h3>
670<ul>
671 <li>cleanup, especially memory wise</li>
672 <li>the parser should be more reliable, especially the HTML one, it should
673 not crash, whatever the input !</li>
674 <li>Integrated various patches, especially a speedup improvement for large
675 dataset from <a href="mailto:cnygard@bellatlantic.net">Carl Nygard</a>,
676 configure with --with-buffers to enable them.</li>
677 <li>attribute normalization, oops should have been added long ago !</li>
678 <li>attributes defaulted from Dtds should be available, xmlSetProp() now
679 does entities escapting by default.</li>
Daniel Veillard4c3a2031999-11-19 17:46:26 +0000680</ul>
Daniel Veillard35008381999-10-25 13:15:52 +0000681
682<h3>1.7.4: Oct 25 1999</h3>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000683<ul>
Daniel Veillard35008381999-10-25 13:15:52 +0000684 <li>Lots of HTML improvement</li>
685 <li>Fixed some errors when saving both XML and HTML</li>
686 <li>More examples, the regression tests should now look clean</li>
687 <li>Fixed a bug with contiguous charref</li>
688</ul>
689
690<h3>1.7.3: Sep 29 1999</h3>
691<ul>
692 <li>portability problems fixed</li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000693 <li>snprintf was used unconditionnally, leading to link problems on system
Daniel Veillard35008381999-10-25 13:15:52 +0000694 were it's not available, fixed</li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000695</ul>
696
697<h3>1.7.1: Sep 24 1999</h3>
698<ul>
699 <li>The basic type for strings manipulated by libxml has been renamed in
700 1.7.1 from <strong>CHAR</strong> to <strong>xmlChar</strong>. The reason
701 is that CHAR was conflicting with a predefined type on Windows. However on
702 non WIN32 environment, compatibility is provided by the way of a
703 <strong>#define </strong>.</li>
704 <li>Changed another error : the use of a structure field called errno, and
705 leading to troubles on platforms where it's a macro</li>
706</ul>
707
708<h3>1.7.0: sep 23 1999</h3>
709<ul>
710 <li>Added the ability to fetch remote DTD or parsed entities, see the <a
Daniel Veillard9cb5ff42001-01-29 08:22:21 +0000711 href="html/libxml-nanohttp.html">nanohttp</a> module.</li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000712 <li>Added an errno to report errors by another mean than a simple printf
713 like callback</li>
714 <li>Finished ID/IDREF support and checking when validation</li>
715 <li>Serious memory leaks fixed (there is now a <a
Daniel Veillard9cb5ff42001-01-29 08:22:21 +0000716 href="html/libxml-xmlmemory.html">memory wrapper</a> module)</li>
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000717 <li>Improvement of <a href="http://www.w3.org/TR/xpath">XPath</a>
718 implementation</li>
719 <li>Added an HTML parser front-end</li>
720</ul>
721
722<h2><a name="XML">XML</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000723
Daniel Veillard402e8c82000-02-29 22:57:47 +0000724<p><a href="http://www.w3.org/TR/REC-xml">XML is a standard</a> for
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000725markup-based structured documents. Here is <a name="example">an example XML
726document</a>:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +0000727<pre>&lt;?xml version="1.0"?&gt;
728&lt;EXAMPLE prop1="gnome is great" prop2="&amp;amp; linux too"&gt;
729 &lt;head&gt;
730 &lt;title&gt;Welcome to Gnome&lt;/title&gt;
731 &lt;/head&gt;
732 &lt;chapter&gt;
733 &lt;title&gt;The Linux adventure&lt;/title&gt;
734 &lt;p&gt;bla bla bla ...&lt;/p&gt;
735 &lt;image href="linus.gif"/&gt;
736 &lt;p&gt;...&lt;/p&gt;
737 &lt;/chapter&gt;
738&lt;/EXAMPLE&gt;</pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000739
Daniel Veillard402e8c82000-02-29 22:57:47 +0000740<p>The first line specifies that it's an XML document and gives useful
741information about its encoding. Then the document is a text format whose
742structure is specified by tags between brackets. <strong>Each tag opened has
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000743to be closed</strong>. XML is pedantic about this. However, if a tag is empty
744(no content), a single tag can serve as both the opening and closing tag if it
Daniel Veillard60979bd2000-07-10 12:17:33 +0000745ends with <code>/&gt;</code> rather than with <code>&gt;</code>. Note that,
746for example, the image tag has no content (just an attribute) and is closed by
747ending the tag with <code>/&gt;</code>.</p>
Daniel Veillardccb09631998-10-27 06:21:04 +0000748
Daniel Veillard402e8c82000-02-29 22:57:47 +0000749<p>XML can be applied sucessfully to a wide range of uses, from long term
750structured document maintenance (where it follows the steps of SGML) to simple
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000751data encoding mechanisms like configuration file formatting (glade),
752spreadsheets (gnumeric), or even shorter lived documents such as WebDAV where
753it is used to encode remote calls between a client and a server.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000754
Daniel Veillard82687162001-01-22 15:32:01 +0000755<h2><a name="XSLT">XSLT</a></h2>
756
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +0000757<p>Check <a href="http://xmlsoft.org/XSLT">the separate libxslt page</a></p>
758
Daniel Veillard82687162001-01-22 15:32:01 +0000759<p><a href="http://www.w3.org/TR/xslt">XSL Transformations</a>, is a language
760for transforming XML documents into other XML documents (or HTML/textual
761output).</p>
762
763<p>A separate library called libxslt is being built on top of libxml2. This
764module "libxslt" can be found in the Gnome CVS base too.</p>
765
Daniel Veillard383b1472001-01-23 11:39:52 +0000766<p>You can check the <a
Daniel Veillard6e6a6cc2001-02-15 15:55:44 +0000767href="http://cvs.gnome.org/lxr/source/libxslt/FEATURES">features</a> supported
768and the progresses on the <a
Daniel Veillard82687162001-01-22 15:32:01 +0000769href="http://cvs.gnome.org/lxr/source/libxslt/ChangeLog">Changelog</a></p>
770
Daniel Veillard4540be42000-08-19 16:40:28 +0000771<h2>An overview of libxml architecture</h2>
772
Daniel Veillardec70e912001-02-26 20:10:45 +0000773<p>Libxml is made of multiple components; some of them are optional, and most
774of the block interfaces are public. The main components are:</p>
Daniel Veillard4540be42000-08-19 16:40:28 +0000775<ul>
776 <li>an Input/Output layer</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000777 <li>FTP and HTTP client layers (optional)</li>
Daniel Veillard4540be42000-08-19 16:40:28 +0000778 <li>an Internationalization layer managing the encodings support</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000779 <li>a URI module</li>
Daniel Veillard4540be42000-08-19 16:40:28 +0000780 <li>the XML parser and its basic SAX interface</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000781 <li>an HTML parser using the same SAX interface (optional)</li>
Daniel Veillard4540be42000-08-19 16:40:28 +0000782 <li>a SAX tree module to build an in-memory DOM representation</li>
783 <li>a tree module to manipulate the DOM representation</li>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000784 <li>a validation module using the DOM representation (optional)</li>
Daniel Veillard4540be42000-08-19 16:40:28 +0000785 <li>an XPath module for global lookup in a DOM representation
Daniel Veillard91e9d582001-02-26 07:31:12 +0000786 (optional)</li>
787 <li>a debug module (optional)</li>
Daniel Veillard4540be42000-08-19 16:40:28 +0000788</ul>
789
790<p>Graphically this gives the following:</p>
791
792<p><img src="libxml.gif" alt="a graphical view of the various"></p>
793
794<p></p>
795
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000796<h2><a name="tree">The tree output</a></h2>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000797
798<p>The parser returns a tree built during the document analysis. The value
Daniel Veillard402e8c82000-02-29 22:57:47 +0000799returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000800<strong>xmlDoc</strong> structure). This structure contains information such
Daniel Veillard306be992000-07-03 12:38:45 +0000801as the file name, the document type, and a <strong>children</strong> pointer
802which is the root of the document (or more exactly the first child under the
803root which is the document). The tree is made of <strong>xmlNode</strong>s,
Daniel Veillard91e9d582001-02-26 07:31:12 +0000804chained in double-linked lists of siblings and with a children&lt;-&gt;parent
Daniel Veillard306be992000-07-03 12:38:45 +0000805relationship. An xmlNode can also carry properties (a chain of xmlAttr
806structures). An attribute may have a value which is a list of TEXT or
807ENTITY_REF nodes.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000808
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000809<p>Here is an example (erroneous with respect to the XML spec since there
810should be only one ELEMENT under the root):</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000811
812<p><img src="structure.gif" alt=" structure.gif "></p>
813
814<p>In the source package there is a small program (not installed by default)
Daniel Veillard361d8452000-04-03 19:48:13 +0000815called <strong>xmllint</strong> which parses XML files given as argument and
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000816prints them back as parsed. This is useful for detecting errors both in XML
817code and in the XML parser itself. It has an option <strong>--debug</strong>
Daniel Veillard91e9d582001-02-26 07:31:12 +0000818which prints the actual in-memory structure of the document; here is the
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000819result with the <a href="#example">example</a> given before:</p>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000820<pre>DOCUMENT
821version=1.0
822standalone=true
823 ELEMENT EXAMPLE
824 ATTRIBUTE prop1
825 TEXT
826 content=gnome is great
827 ATTRIBUTE prop2
828 ENTITY_REF
829 TEXT
Daniel Veillard0142b842000-01-14 14:45:24 +0000830 content= linux too
Daniel Veillard402e8c82000-02-29 22:57:47 +0000831 ELEMENT head
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000832 ELEMENT title
Daniel Veillard25940b71998-10-29 05:51:30 +0000833 TEXT
834 content=Welcome to Gnome
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000835 ELEMENT chapter
836 ELEMENT title
Daniel Veillard25940b71998-10-29 05:51:30 +0000837 TEXT
838 content=The Linux adventure
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000839 ELEMENT p
Daniel Veillard25940b71998-10-29 05:51:30 +0000840 TEXT
841 content=bla bla bla ...
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000842 ELEMENT image
843 ATTRIBUTE href
844 TEXT
845 content=linus.gif
846 ELEMENT p
Daniel Veillard25940b71998-10-29 05:51:30 +0000847 TEXT
848 content=...</pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000849
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000850<p>This should be useful for learning the internal representation model.</p>
Daniel Veillardccb09631998-10-27 06:21:04 +0000851
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000852<h2><a name="interface">The SAX interface</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000853
Daniel Veillard402e8c82000-02-29 22:57:47 +0000854<p>Sometimes the DOM tree output is just too large to fit reasonably into
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000855memory. In that case (and if you don't expect to save back the XML document
856loaded using libxml), it's better to use the SAX interface of libxml. SAX is a
Daniel Veillard402e8c82000-02-29 22:57:47 +0000857<strong>callback-based interface</strong> to the parser. Before parsing, the
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000858application layer registers a customized set of callbacks which are called by
859the library as it progresses through the XML input.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000860
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000861<p>To get more detailed step-by-step guidance on using the SAX interface of
Daniel Veillard4540be42000-08-19 16:40:28 +0000862libxml, see the <a
863href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
864documentation</a>.written by <a href="mailto:james@daa.com.au">James
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000865Henstridge</a>.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000866
867<p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
868program located in the gnome-xml module (it's usually not shipped in the
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000869binary packages of libxml, but you can find it in the tar source
Daniel Veillard402e8c82000-02-29 22:57:47 +0000870distribution). Here is the sequence of callbacks that would be reported by
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000871testSAX when parsing the example XML document shown earlier:</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000872<pre>SAX.setDocumentLocator()
873SAX.startDocument()
874SAX.getEntity(amp)
875SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp;amp; linux too')
876SAX.characters( , 3)
877SAX.startElement(head)
878SAX.characters( , 4)
879SAX.startElement(title)
880SAX.characters(Welcome to Gnome, 16)
881SAX.endElement(title)
882SAX.characters( , 3)
883SAX.endElement(head)
884SAX.characters( , 3)
885SAX.startElement(chapter)
886SAX.characters( , 4)
887SAX.startElement(title)
888SAX.characters(The Linux adventure, 19)
889SAX.endElement(title)
890SAX.characters( , 4)
891SAX.startElement(p)
892SAX.characters(bla bla bla ..., 15)
893SAX.endElement(p)
894SAX.characters( , 4)
895SAX.startElement(image, href='linus.gif')
896SAX.endElement(image)
897SAX.characters( , 4)
898SAX.startElement(p)
899SAX.characters(..., 3)
900SAX.endElement(p)
901SAX.characters( , 3)
902SAX.endElement(chapter)
903SAX.characters( , 1)
904SAX.endElement(EXAMPLE)
905SAX.endDocument()</pre>
906
Daniel Veillardec70e912001-02-26 20:10:45 +0000907<p>Most of the other interfaces of libxml are based on the DOM tree-building
908facility, so nearly everything up to the end of this document presupposes the
909use of the standard DOM tree build. Note that the DOM tree itself is built by
910a set of registered default callbacks, without internal specific
911interface.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000912
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000913<h2><a name="library">The XML library interfaces</a></h2>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000914
915<p>This section is directly intended to help programmers getting bootstrapped
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000916using the XML library from the C language. It is not intended to be extensive.
917I hope the automatically generated documents will provide the completeness
918required, but as a separate set of documents. The interfaces of the XML
919library are by principle low level, there is nearly zero abstraction. Those
Daniel Veillardc8eab3a1999-09-04 18:27:23 +0000920interested in a higher level API should <a href="#DOM">look at DOM</a>.</p>
Daniel Veillardccb09631998-10-27 06:21:04 +0000921
Daniel Veillard9cb5ff42001-01-29 08:22:21 +0000922<p>The <a href="html/libxml-parser.html">parser interfaces for XML</a> are
923separated from the <a href="html/libxml-htmlparser.html">HTML parser
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000924interfaces</a>. Let's have a look at how the XML parser can be called:</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000925
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000926<h3><a name="Invoking">Invoking the parser : the pull method</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000927
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000928<p>Usually, the first thing to do is to read an XML input. The parser accepts
929documents either from in-memory strings or from files. The functions are
Daniel Veillardb05deb71999-08-10 19:04:08 +0000930defined in "parser.h":</p>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000931<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000932 <dt><code>xmlDocPtr xmlParseMemory(char *buffer, int size);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000933 <dd><p>Parse a null-terminated string containing the document.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000934 </dd>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000935</dl>
936<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000937 <dt><code>xmlDocPtr xmlParseFile(const char *filename);</code></dt>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000938 <dd><p>Parse an XML document contained in a (possibly compressed)
939 file.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000940 </dd>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000941</dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000942
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000943<p>The parser returns a pointer to the document structure (or NULL in case of
Daniel Veillard10c6a8f1998-10-28 01:00:12 +0000944failure).</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000945
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000946<h3 id="Invoking1">Invoking the parser: the push method</h3>
Daniel Veillard0142b842000-01-14 14:45:24 +0000947
Daniel Veillard91e9d582001-02-26 07:31:12 +0000948<p>In order for the application to keep the control when the document is being
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000949fetched (which is common for GUI based programs) libxml provides a push
950interface, too, as of version 1.8.3. Here are the interface functions:</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000951<pre>xmlParserCtxtPtr xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax,
952 void *user_data,
953 const char *chunk,
954 int size,
955 const char *filename);
956int xmlParseChunk (xmlParserCtxtPtr ctxt,
957 const char *chunk,
958 int size,
959 int terminate);</pre>
960
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000961<p>and here is a simple example showing how to use the interface:</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000962<pre> FILE *f;
963
964 f = fopen(filename, "r");
965 if (f != NULL) {
966 int res, size = 1024;
967 char chars[1024];
968 xmlParserCtxtPtr ctxt;
969
970 res = fread(chars, 1, 4, f);
Daniel Veillard60979bd2000-07-10 12:17:33 +0000971 if (res &gt; 0) {
Daniel Veillard0142b842000-01-14 14:45:24 +0000972 ctxt = xmlCreatePushParserCtxt(NULL, NULL,
973 chars, res, filename);
Daniel Veillard60979bd2000-07-10 12:17:33 +0000974 while ((res = fread(chars, 1, size, f)) &gt; 0) {
Daniel Veillard0142b842000-01-14 14:45:24 +0000975 xmlParseChunk(ctxt, chars, res, 0);
976 }
977 xmlParseChunk(ctxt, chars, 0, 1);
Daniel Veillard60979bd2000-07-10 12:17:33 +0000978 doc = ctxt-&gt;myDoc;
Daniel Veillard0142b842000-01-14 14:45:24 +0000979 xmlFreeParserCtxt(ctxt);
980 }
981 }</pre>
982
Daniel Veillardec70e912001-02-26 20:10:45 +0000983<p>The HTML parser embedded into libxml also has a push interface; the
984functions are just prefixed by "html" rather than "xml".</p>
Daniel Veillard0142b842000-01-14 14:45:24 +0000985
986<h3 id="Invoking2">Invoking the parser: the SAX interface</h3>
987
Daniel Veillardec70e912001-02-26 20:10:45 +0000988<p>The tree-building interface makes the parser memory-hungry, first loading
989the document in memory and then building the tree itself. Reading a document
990without building the tree is possible using the SAX interfaces (see SAX.h and
991<a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">James
Daniel Veillard88f00ae2000-03-02 00:15:55 +0000992Henstridge's documentation</a>). Note also that the push interface can be
Daniel Veillard91e9d582001-02-26 07:31:12 +0000993limited to SAX: just use the two first arguments of
Daniel Veillard0142b842000-01-14 14:45:24 +0000994<code>xmlCreatePushParserCtxt()</code>.</p>
Daniel Veillardccb09631998-10-27 06:21:04 +0000995
Daniel Veillard2f4dfc41999-09-24 14:03:48 +0000996<h3><a name="Building">Building a tree from scratch</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +0000997
998<p>The other way to get an XML tree in memory is by building it. Basically
Daniel Veillardf13e1ed2000-03-06 07:41:49 +0000999there is a set of functions dedicated to building new elements. (These are
Daniel Veillard60979bd2000-07-10 12:17:33 +00001000also described in &lt;libxml/tree.h&gt;.) For example, here is a piece of code
Daniel Veillard361d8452000-04-03 19:48:13 +00001001that produces the XML document used in the previous examples:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001002<pre> #include &lt;libxml/tree.h&gt;
Daniel Veillard361d8452000-04-03 19:48:13 +00001003 xmlDocPtr doc;
Daniel Veillard25940b71998-10-29 05:51:30 +00001004 xmlNodePtr tree, subtree;
1005
1006 doc = xmlNewDoc("1.0");
Daniel Veillard60979bd2000-07-10 12:17:33 +00001007 doc-&gt;children = xmlNewDocNode(doc, NULL, "EXAMPLE", NULL);
1008 xmlSetProp(doc-&gt;children, "prop1", "gnome is great");
1009 xmlSetProp(doc-&gt;children, "prop2", "&amp; linux too");
1010 tree = xmlNewChild(doc-&gt;children, NULL, "head", NULL);
Daniel Veillard25940b71998-10-29 05:51:30 +00001011 subtree = xmlNewChild(tree, NULL, "title", "Welcome to Gnome");
Daniel Veillard60979bd2000-07-10 12:17:33 +00001012 tree = xmlNewChild(doc-&gt;children, NULL, "chapter", NULL);
Daniel Veillard25940b71998-10-29 05:51:30 +00001013 subtree = xmlNewChild(tree, NULL, "title", "The Linux adventure");
1014 subtree = xmlNewChild(tree, NULL, "p", "bla bla bla ...");
1015 subtree = xmlNewChild(tree, NULL, "image", NULL);
1016 xmlSetProp(subtree, "href", "linus.gif");</pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001017
1018<p>Not really rocket science ...</p>
Daniel Veillard25940b71998-10-29 05:51:30 +00001019
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001020<h3><a name="Traversing">Traversing the tree</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001021
Daniel Veillard9cb5ff42001-01-29 08:22:21 +00001022<p>Basically by <a href="html/libxml-tree.html">including "tree.h"</a> your
Daniel Veillard306be992000-07-03 12:38:45 +00001023code has access to the internal structure of all the elements of the tree. The
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001024names should be somewhat simple like <strong>parent</strong>,
Daniel Veillard306be992000-07-03 12:38:45 +00001025<strong>children</strong>, <strong>next</strong>, <strong>prev</strong>,
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001026<strong>properties</strong>, etc... For example, still with the previous
Daniel Veillard0142b842000-01-14 14:45:24 +00001027example:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001028<pre><code>doc-&gt;children-&gt;children-&gt;children</code></pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001029
1030<p>points to the title element,</p>
Daniel Veillard91e9d582001-02-26 07:31:12 +00001031<pre>doc-&gt;children-&gt;children-&gt;next-&gt;children-&gt;children</pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001032
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001033<p>points to the text node containing the chapter title "The Linux
1034adventure".</p>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +00001035
Daniel Veillardb24054a1999-12-18 15:32:46 +00001036<p><strong>NOTE</strong>: XML allows <em>PI</em>s and <em>comments</em> to be
Daniel Veillard60979bd2000-07-10 12:17:33 +00001037present before the document root, so <code>doc-&gt;children</code> may point
Daniel Veillard91e9d582001-02-26 07:31:12 +00001038to an element which is not the document Root Element; a function
Daniel Veillard5cb5ab81999-12-21 15:35:29 +00001039<code>xmlDocGetRootElement()</code> was added for this purpose.</p>
Daniel Veillardb24054a1999-12-18 15:32:46 +00001040
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001041<h3><a name="Modifying">Modifying the tree</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001042
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001043<p>Functions are provided for reading and writing the document content. Here
Daniel Veillard9cb5ff42001-01-29 08:22:21 +00001044is an excerpt from the <a href="html/libxml-tree.html">tree API</a>:</p>
Daniel Veillard25940b71998-10-29 05:51:30 +00001045<dl>
Daniel Veillarddd6b3671999-09-23 22:19:22 +00001046 <dt><code>xmlAttrPtr xmlSetProp(xmlNodePtr node, const xmlChar *name, const
1047 xmlChar *value);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001048 <dd><p>This sets (or changes) an attribute carried by an ELEMENT node. The
1049 value can be NULL.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001050 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001051</dl>
1052<dl>
Daniel Veillarddd6b3671999-09-23 22:19:22 +00001053 <dt><code>const xmlChar *xmlGetProp(xmlNodePtr node, const xmlChar
Daniel Veillardb05deb71999-08-10 19:04:08 +00001054 *name);</code></dt>
Daniel Veillardc92c3042000-09-29 02:42:04 +00001055 <dd><p>This function returns a pointer to new copy of the property
1056 content. Note that the user must deallocate the result.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001057 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001058</dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001059
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001060<p>Two functions are provided for reading and writing the text associated with
Daniel Veillard25940b71998-10-29 05:51:30 +00001061elements:</p>
1062<dl>
Daniel Veillarddd6b3671999-09-23 22:19:22 +00001063 <dt><code>xmlNodePtr xmlStringGetNodeList(xmlDocPtr doc, const xmlChar
Daniel Veillardb05deb71999-08-10 19:04:08 +00001064 *value);</code></dt>
Daniel Veillardec70e912001-02-26 20:10:45 +00001065 <dd><p>This function takes an "external" string and converts it to one
1066 text node or possibly to a list of entity and text nodes. All
1067 non-predefined entity references like &amp;Gnome; will be stored
1068 internally as entity nodes, hence the result of the function may not be
1069 a single node.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001070 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001071</dl>
1072<dl>
Daniel Veillarddd6b3671999-09-23 22:19:22 +00001073 <dt><code>xmlChar *xmlNodeListGetString(xmlDocPtr doc, xmlNodePtr list, int
Daniel Veillardb05deb71999-08-10 19:04:08 +00001074 inLine);</code></dt>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001075 <dd><p>This function is the inverse of
1076 <code>xmlStringGetNodeList()</code>. It generates a new string
1077 containing the content of the text and entity nodes. Note the extra
1078 argument inLine. If this argument is set to 1, the function will expand
1079 entity references. For example, instead of returning the &amp;Gnome;
1080 XML encoding in the string, it will substitute it with its value (say,
Daniel Veillard91e9d582001-02-26 07:31:12 +00001081 "GNU Network Object Model Environment").</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001082 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001083</dl>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +00001084
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001085<h3><a name="Saving">Saving a tree</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001086
1087<p>Basically 3 options are possible:</p>
Daniel Veillard25940b71998-10-29 05:51:30 +00001088<dl>
Daniel Veillarddd6b3671999-09-23 22:19:22 +00001089 <dt><code>void xmlDocDumpMemory(xmlDocPtr cur, xmlChar**mem, int
Daniel Veillardb05deb71999-08-10 19:04:08 +00001090 *size);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001091 <dd><p>Returns a buffer into which the document has been saved.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001092 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001093</dl>
1094<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001095 <dt><code>extern void xmlDocDump(FILE *f, xmlDocPtr doc);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001096 <dd><p>Dumps a document to an open file descriptor.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001097 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001098</dl>
1099<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001100 <dt><code>int xmlSaveFile(const char *filename, xmlDocPtr cur);</code></dt>
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001101 <dd><p>Saves the document to a file. In this case, the compression
1102 interface is triggered if it has been turned on.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001103 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001104</dl>
Daniel Veillard10c6a8f1998-10-28 01:00:12 +00001105
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001106<h3><a name="Compressio">Compression</a></h3>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001107
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001108<p>The library transparently handles compression when doing file-based
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001109accesses. The level of compression on saves can be turned on either globally
1110or individually for one file:</p>
Daniel Veillard25940b71998-10-29 05:51:30 +00001111<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001112 <dt><code>int xmlGetDocCompressMode (xmlDocPtr doc);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001113 <dd><p>Gets the document compression ratio (0-9).</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001114 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001115</dl>
1116<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001117 <dt><code>void xmlSetDocCompressMode (xmlDocPtr doc, int mode);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001118 <dd><p>Sets the document compression ratio.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001119 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001120</dl>
1121<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001122 <dt><code>int xmlGetCompressMode(void);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001123 <dd><p>Gets the default compression ratio.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001124 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001125</dl>
1126<dl>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001127 <dt><code>void xmlSetCompressMode(int mode);</code></dt>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001128 <dd><p>Sets the default compression ratio.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001129 </dd>
Daniel Veillard25940b71998-10-29 05:51:30 +00001130</dl>
1131
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001132<h2><a name="Entities">Entities or no entities</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001133
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001134<p>Entities in principle are similar to simple C macros. An entity defines an
1135abbreviation for a given string that you can reuse many times throughout the
1136content of your document. Entities are especially useful when a given string
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001137may occur frequently within a document, or to confine the change needed to a
1138document to a restricted area in the internal subset of the document (at the
1139beginning). Example:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001140<pre>1 &lt;?xml version="1.0"?&gt;
Daniel Veillardc8eab3a1999-09-04 18:27:23 +000011412 &lt;!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
Daniel Veillard60979bd2000-07-10 12:17:33 +000011423 &lt;!ENTITY xml "Extensible Markup Language"&gt;
11434 ]&gt;
11445 &lt;EXAMPLE&gt;
Daniel Veillardc8eab3a1999-09-04 18:27:23 +000011456 &amp;xml;
Daniel Veillard60979bd2000-07-10 12:17:33 +000011467 &lt;/EXAMPLE&gt;</pre>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001147
1148<p>Line 3 declares the xml entity. Line 6 uses the xml entity, by prefixing
Daniel Veillard91e9d582001-02-26 07:31:12 +00001149its name with '&amp;' and following it by ';' without any spaces added. There
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001150are 5 predefined entities in libxml allowing you to escape charaters with
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001151predefined meaning in some parts of the xml document content:
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001152<strong>&amp;lt;</strong> for the character '&lt;', <strong>&amp;gt;</strong>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001153for the character '&gt;', <strong>&amp;apos;</strong> for the character ''',
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001154<strong>&amp;quot;</strong> for the character '"', and
1155<strong>&amp;amp;</strong> for the character '&amp;'.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001156
1157<p>One of the problems related to entities is that you may want the parser to
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001158substitute an entity's content so that you can see the replacement text in
1159your application. Or you may prefer to keep entity references as such in the
1160content to be able to save the document back without losing this usually
1161precious information (if the user went through the pain of explicitly defining
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001162entities, he may have a a rather negative attitude if you blindly susbtitute
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001163them as saving time). The <a
Daniel Veillard9cb5ff42001-01-29 08:22:21 +00001164href="html/libxml-parser.html#XMLSUBSTITUTEENTITIESDEFAULT">xmlSubstituteEntitiesDefault()</a>
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001165function allows you to check and change the behaviour, which is to not
1166substitute entities by default.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001167
1168<p>Here is the DOM tree built by libxml for the previous document in the
1169default case:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001170<pre>/gnome/src/gnome-xml -&gt; ./xmllint --debug test/ent1
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001171DOCUMENT
1172version=1.0
1173 ELEMENT EXAMPLE
1174 TEXT
1175 content=
1176 ENTITY_REF
1177 INTERNAL_GENERAL_ENTITY xml
1178 content=Extensible Markup Language
1179 TEXT
1180 content=</pre>
1181
1182<p>And here is the result when substituting entities:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001183<pre>/gnome/src/gnome-xml -&gt; ./tester --debug --noent test/ent1
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001184DOCUMENT
1185version=1.0
1186 ELEMENT EXAMPLE
1187 TEXT
1188 content= Extensible Markup Language</pre>
1189
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001190<p>So, entities or no entities? Basically, it depends on your use case. I
1191suggest that you keep the non-substituting default behaviour and avoid using
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001192entities in your XML document or data if you are not willing to handle the
1193entity references elements in the DOM tree.</p>
1194
Daniel Veillard91e9d582001-02-26 07:31:12 +00001195<p>Note that at save time libxml enforces the conversion of the predefined
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001196entities where necessary to prevent well-formedness problems, and will also
Daniel Veillard91e9d582001-02-26 07:31:12 +00001197transparently replace those with chars (i.e. it will not generate entity
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001198reference elements in the DOM tree or call the reference() SAX callback when
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001199finding them in the input).</p>
1200
Daniel Veillard7b9c4b72000-08-25 16:26:50 +00001201<p><span style="background-color: #FF0000">WARNING</span>: handling entities
Daniel Veillard91e9d582001-02-26 07:31:12 +00001202on top of the libxml SAX interface is difficult!!! If you plan to use
Daniel Veillard7b9c4b72000-08-25 16:26:50 +00001203non-predefined entities in your documents, then the learning cuvre to handle
Daniel Veillard91e9d582001-02-26 07:31:12 +00001204then using the SAX API may be long. If you plan to use complex documents, I
Daniel Veillard7b9c4b72000-08-25 16:26:50 +00001205strongly suggest you consider using the DOM interface instead and let libxml
Daniel Veillard8c6d6af2000-08-25 17:14:13 +00001206deal with the complexity rather than trying to do it yourself.</p>
Daniel Veillard7b9c4b72000-08-25 16:26:50 +00001207
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001208<h2><a name="Namespaces">Namespaces</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001209
Daniel Veillardec303412000-03-24 13:41:54 +00001210<p>The libxml library implements <a
1211href="http://www.w3.org/TR/REC-xml-names/">XML namespaces</a> support by
1212recognizing namespace contructs in the input, and does namespace lookup
1213automatically when building the DOM tree. A namespace declaration is
1214associated with an in-memory structure and all elements or attributes within
1215that namespace point to it. Hence testing the namespace is a simple and fast
1216equality operation at the user level.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001217
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001218<p>I suggest that people using libxml use a namespace, and declare it in the
1219root element of their document as the default namespace. Then they don't need
1220to use the prefix in the content but we will have a basis for future semantic
Daniel Veillard91e9d582001-02-26 07:31:12 +00001221refinement and merging of data from different sources. This doesn't increase
Daniel Veillardec70e912001-02-26 20:10:45 +00001222the size of the XML output significantly, but significantly increases its
1223value in the long-term. Example:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001224<pre>&lt;mydoc xmlns="http://mydoc.example.org/schemas/"&gt;
1225 &lt;elem1&gt;...&lt;/elem1&gt;
1226 &lt;elem2&gt;...&lt;/elem2&gt;
1227&lt;/mydoc&gt;</pre>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001228
Daniel Veillardec70e912001-02-26 20:10:45 +00001229<p>The namespace value has to be an absolute URL, but the URL doesn't have to
1230point to any existing resource on the Web. It will bind all the element and
1231atributes with that URL. I suggest to use an URL within a domain you control,
1232and that the URL should contain some kind of version information if possible.
1233For example, <code>"http://www.gnome.org/gnumeric/1.0/"</code> is a good
1234namespace scheme.</p>
Daniel Veillardec303412000-03-24 13:41:54 +00001235
1236<p>Then when you load a file, make sure that a namespace carrying the
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001237version-independent prefix is installed on the root element of your document,
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001238and if the version information don't match something you know, warn the user
1239and be liberal in what you accept as the input. Also do *not* try to base
Daniel Veillard60979bd2000-07-10 12:17:33 +00001240namespace checking on the prefix value. &lt;foo:text&gt; may be exactly the
Daniel Veillard91e9d582001-02-26 07:31:12 +00001241same as &lt;bar:text&gt; in another document. What really matters is the URI
Daniel Veillard60979bd2000-07-10 12:17:33 +00001242associated with the element or the attribute, not the prefix string (which is
Daniel Veillard91e9d582001-02-26 07:31:12 +00001243just a shortcut for the full URI). In libxml, element and attributes have an
Daniel Veillardec303412000-03-24 13:41:54 +00001244<code>ns</code> field pointing to an xmlNs structure detailing the namespace
Daniel Veillard91e9d582001-02-26 07:31:12 +00001245prefix and its URI.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001246
1247<p>@@Interfaces@@</p>
1248
1249<p>@@Examples@@</p>
1250
Daniel Veillard91e9d582001-02-26 07:31:12 +00001251<p>Usually people object to using namespaces together with validity checking.
1252I will try to make sure that using namespaces won't break validity checking,
1253so even if you plan to use or currently are using validation I strongly
Daniel Veillardf13e1ed2000-03-06 07:41:49 +00001254suggest adding namespaces to your document. A default namespace scheme
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001255<code>xmlns="http://...."</code> should not break validity even on less
Daniel Veillard91e9d582001-02-26 07:31:12 +00001256flexible parsers. Using namespaces to mix and differentiate content coming
Daniel Veillard88f00ae2000-03-02 00:15:55 +00001257from multiple DTDs will certainly break current validation schemes. I will try
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001258to provide ways to do this, but this may not be portable or standardized.</p>
1259
Daniel Veillard2f4dfc41999-09-24 14:03:48 +00001260<h2><a name="Validation">Validation, or are you afraid of DTDs ?</a></h2>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001261
1262<p>Well what is validation and what is a DTD ?</p>
1263
1264<p>Validation is the process of checking a document against a set of
Daniel Veillard91e9d582001-02-26 07:31:12 +00001265construction rules; a <strong>DTD</strong> (Document Type Definition) is such
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001266a set of rules.</p>
1267
1268<p>The validation process and building DTDs are the two most difficult parts
Daniel Veillard91e9d582001-02-26 07:31:12 +00001269of the XML life cycle. Briefly a DTD defines all the possibles element to be
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001270found within your document, what is the formal shape of your document tree (by
1271defining the allowed content of an element, either text, a regular expression
Daniel Veillard306be992000-07-03 12:38:45 +00001272for the allowed list of children, or mixed content i.e. both text and
1273children). The DTD also defines the allowed attributes for all elements and
Daniel Veillardec70e912001-02-26 20:10:45 +00001274the types of the attributes. For more detailed information, I suggest that you
Daniel Veillard81781102001-03-07 09:31:47 +00001275read the related parts of the XML specification, the examples found under
Daniel Veillardec70e912001-02-26 20:10:45 +00001276gnome-xml/test/valid/dtd and any of the large number of books available on
1277XML. The dia example in gnome-xml/test/valid should be both simple and
1278complete enough to allow you to build your own.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001279
Daniel Veillard91e9d582001-02-26 07:31:12 +00001280<p>A word of warning, building a good DTD which will fit the needs of your
1281application in the long-term is far from trivial; however, the extra level of
1282quality it can ensure is well worth the price for some sets of applications or
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001283if you already have already a DTD defined for your application field.</p>
1284
1285<p>The validation is not completely finished but in a (very IMHO) usable
1286state. Until a real validation interface is defined the way to do it is to
1287define and set the <strong>xmlDoValidityCheckingDefaultValue</strong> external
1288variable to 1, this will of course be changed at some point:</p>
1289
1290<p>extern int xmlDoValidityCheckingDefaultValue;</p>
1291
1292<p>...</p>
1293
1294<p>xmlDoValidityCheckingDefaultValue = 1;</p>
1295
1296<p></p>
1297
1298<p>To handle external entities, use the function
1299<strong>xmlSetExternalEntityLoader</strong>(xmlExternalEntityLoader f); to
1300link in you HTTP/FTP/Entities database library to the standard libxml
1301core.</p>
1302
1303<p>@@interfaces@@</p>
1304
Daniel Veillard35008381999-10-25 13:15:52 +00001305<h2><a name="DOM"></a><a name="Principles">DOM Principles</a></h2>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001306
1307<p><a href="http://www.w3.org/DOM/">DOM</a> stands for the <em>Document Object
Daniel Veillard91e9d582001-02-26 07:31:12 +00001308Model</em>; this is an API for accessing XML or HTML structured documents.
Daniel Veillardec70e912001-02-26 20:10:45 +00001309Native support for DOM in Gnome is on the way (module gnome-dom), and will be
1310based on gnome-xml. This will be a far cleaner interface to manipulate XML
Daniel Veillard3197f162001-04-04 00:40:08 +00001311files within Gnome since it won't expose the internal structure.</p>
Daniel Veillard14fff061999-06-22 21:49:07 +00001312
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001313<p>The current DOM implementation on top of libxml is the <a
Daniel Veillarda47fb3d2001-03-25 17:23:49 +00001314href="http://cvs.gnome.org/lxr/source/gdome2/">gdome2 Gnome module</a>, this
1315is a full DOM interface, thanks to Paolo Casarini, check the <a
1316href="http://www.cs.unibo.it/~casarini/gdome2/">Gdome2 homepage</a> for more
1317informations.</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001318
Daniel Veillarda47fb3d2001-03-25 17:23:49 +00001319<p>The gnome-dom and gdome modules in the Gnome CVS base are obsolete</p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001320
Daniel Veillard35008381999-10-25 13:15:52 +00001321<h2><a name="Example"></a><a name="real">A real example</a></h2>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001322
1323<p>Here is a real size example, where the actual content of the application
1324data is not kept in the DOM tree but uses internal structures. It is based on
Daniel Veillard14fff061999-06-22 21:49:07 +00001325a proposal to keep a database of jobs related to Gnome, with an XML based
Daniel Veillardb05deb71999-08-10 19:04:08 +00001326storage structure. Here is an <a href="gjobs.xml">XML encoded jobs
1327base</a>:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001328<pre>&lt;?xml version="1.0"?&gt;
1329&lt;gjob:Helping xmlns:gjob="http://www.gnome.org/some-location"&gt;
1330 &lt;gjob:Jobs&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001331
Daniel Veillard60979bd2000-07-10 12:17:33 +00001332 &lt;gjob:Job&gt;
1333 &lt;gjob:Project ID="3"/&gt;
1334 &lt;gjob:Application&gt;GBackup&lt;/gjob:Application&gt;
1335 &lt;gjob:Category&gt;Development&lt;/gjob:Category&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001336
Daniel Veillard60979bd2000-07-10 12:17:33 +00001337 &lt;gjob:Update&gt;
1338 &lt;gjob:Status&gt;Open&lt;/gjob:Status&gt;
1339 &lt;gjob:Modified&gt;Mon, 07 Jun 1999 20:27:45 -0400 MET DST&lt;/gjob:Modified&gt;
1340 &lt;gjob:Salary&gt;USD 0.00&lt;/gjob:Salary&gt;
1341 &lt;/gjob:Update&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001342
Daniel Veillard60979bd2000-07-10 12:17:33 +00001343 &lt;gjob:Developers&gt;
1344 &lt;gjob:Developer&gt;
1345 &lt;/gjob:Developer&gt;
1346 &lt;/gjob:Developers&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001347
Daniel Veillard60979bd2000-07-10 12:17:33 +00001348 &lt;gjob:Contact&gt;
1349 &lt;gjob:Person&gt;Nathan Clemons&lt;/gjob:Person&gt;
1350 &lt;gjob:Email&gt;nathan@windsofstorm.net&lt;/gjob:Email&gt;
1351 &lt;gjob:Company&gt;
1352 &lt;/gjob:Company&gt;
1353 &lt;gjob:Organisation&gt;
1354 &lt;/gjob:Organisation&gt;
1355 &lt;gjob:Webpage&gt;
1356 &lt;/gjob:Webpage&gt;
1357 &lt;gjob:Snailmail&gt;
1358 &lt;/gjob:Snailmail&gt;
1359 &lt;gjob:Phone&gt;
1360 &lt;/gjob:Phone&gt;
1361 &lt;/gjob:Contact&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001362
Daniel Veillard60979bd2000-07-10 12:17:33 +00001363 &lt;gjob:Requirements&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001364 The program should be released as free software, under the GPL.
Daniel Veillard60979bd2000-07-10 12:17:33 +00001365 &lt;/gjob:Requirements&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001366
Daniel Veillard60979bd2000-07-10 12:17:33 +00001367 &lt;gjob:Skills&gt;
1368 &lt;/gjob:Skills&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001369
Daniel Veillard60979bd2000-07-10 12:17:33 +00001370 &lt;gjob:Details&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001371 A GNOME based system that will allow a superuser to configure
1372 compressed and uncompressed files and/or file systems to be backed
1373 up with a supported media in the system. This should be able to
1374 perform via find commands generating a list of files that are passed
1375 to tar, dd, cpio, cp, gzip, etc., to be directed to the tape machine
1376 or via operations performed on the filesystem itself. Email
1377 notification and GUI status display very important.
Daniel Veillard60979bd2000-07-10 12:17:33 +00001378 &lt;/gjob:Details&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001379
Daniel Veillard60979bd2000-07-10 12:17:33 +00001380 &lt;/gjob:Job&gt;
Daniel Veillard14fff061999-06-22 21:49:07 +00001381
Daniel Veillard60979bd2000-07-10 12:17:33 +00001382 &lt;/gjob:Jobs&gt;
1383&lt;/gjob:Helping&gt;</pre>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001384
1385<p>While loading the XML file into an internal DOM tree is a matter of calling
Daniel Veillardec70e912001-02-26 20:10:45 +00001386only a couple of functions, browsing the tree to gather the ata and generate
1387the internal structures is harder, and more error prone.</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001388
1389<p>The suggested principle is to be tolerant with respect to the input
Daniel Veillardec70e912001-02-26 20:10:45 +00001390structure. For example, the ordering of the attributes is not significant, the
1391XML specification is clear about it. It's also usually a good idea not to
1392depend on the order of the children of a given node, unless it really makes
1393things harder. Here is some code to parse the information for a person:</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001394<pre>/*
Daniel Veillard14fff061999-06-22 21:49:07 +00001395 * A person record
1396 */
1397typedef struct person {
1398 char *name;
1399 char *email;
1400 char *company;
1401 char *organisation;
1402 char *smail;
1403 char *webPage;
1404 char *phone;
1405} person, *personPtr;
1406
1407/*
1408 * And the code needed to parse it
1409 */
1410personPtr parsePerson(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
1411 personPtr ret = NULL;
1412
1413DEBUG("parsePerson\n");
1414 /*
1415 * allocate the struct
1416 */
1417 ret = (personPtr) malloc(sizeof(person));
1418 if (ret == NULL) {
1419 fprintf(stderr,"out of memory\n");
Daniel Veillardb05deb71999-08-10 19:04:08 +00001420 return(NULL);
Daniel Veillard14fff061999-06-22 21:49:07 +00001421 }
1422 memset(ret, 0, sizeof(person));
1423
1424 /* We don't care what the top level element name is */
Daniel Veillard60979bd2000-07-10 12:17:33 +00001425 cur = cur-&gt;xmlChildrenNode;
Daniel Veillard14fff061999-06-22 21:49:07 +00001426 while (cur != NULL) {
Daniel Veillard60979bd2000-07-10 12:17:33 +00001427 if ((!strcmp(cur-&gt;name, "Person")) &amp;&amp; (cur-&gt;ns == ns))
1428 ret-&gt;name = xmlNodeListGetString(doc, cur-&gt;xmlChildrenNode, 1);
1429 if ((!strcmp(cur-&gt;name, "Email")) &amp;&amp; (cur-&gt;ns == ns))
1430 ret-&gt;email = xmlNodeListGetString(doc, cur-&gt;xmlChildrenNode, 1);
1431 cur = cur-&gt;next;
Daniel Veillard14fff061999-06-22 21:49:07 +00001432 }
1433
1434 return(ret);
Daniel Veillardb05deb71999-08-10 19:04:08 +00001435}</pre>
1436
Daniel Veillard91e9d582001-02-26 07:31:12 +00001437<p>Here are a couple of things to notice:</p>
Daniel Veillard14fff061999-06-22 21:49:07 +00001438<ul>
Daniel Veillard91e9d582001-02-26 07:31:12 +00001439 <li>Usually a recursive parsing style is the more convenient one: XML data
1440 is by nature subject to repetitive constructs and usually exibits highly
Daniel Veillardb05deb71999-08-10 19:04:08 +00001441 stuctured patterns.</li>
1442 <li>The two arguments of type <em>xmlDocPtr</em> and <em>xmlNsPtr</em>, i.e.
1443 the pointer to the global XML document and the namespace reserved to the
1444 application. Document wide information are needed for example to decode
1445 entities and it's a good coding practice to define a namespace for your
1446 application set of data and test that the element and attributes you're
1447 analyzing actually pertains to your application space. This is done by a
Daniel Veillard60979bd2000-07-10 12:17:33 +00001448 simple equality test (cur-&gt;ns == ns).</li>
Daniel Veillardec70e912001-02-26 20:10:45 +00001449 <li>To retrieve text and attributes value, you can use the function
1450 <em>xmlNodeListGetString</em> to gather all the text and entity reference
1451 nodes generated by the DOM output and produce an single text string.</li>
Daniel Veillard14fff061999-06-22 21:49:07 +00001452</ul>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001453
1454<p>Here is another piece of code used to parse another level of the
1455structure:</p>
Daniel Veillard60979bd2000-07-10 12:17:33 +00001456<pre>#include &lt;libxml/tree.h&gt;
Daniel Veillard361d8452000-04-03 19:48:13 +00001457/*
Daniel Veillard14fff061999-06-22 21:49:07 +00001458 * a Description for a Job
1459 */
1460typedef struct job {
1461 char *projectID;
1462 char *application;
1463 char *category;
1464 personPtr contact;
1465 int nbDevelopers;
1466 personPtr developers[100]; /* using dynamic alloc is left as an exercise */
1467} job, *jobPtr;
1468
1469/*
1470 * And the code needed to parse it
1471 */
1472jobPtr parseJob(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
1473 jobPtr ret = NULL;
1474
1475DEBUG("parseJob\n");
1476 /*
1477 * allocate the struct
1478 */
1479 ret = (jobPtr) malloc(sizeof(job));
1480 if (ret == NULL) {
1481 fprintf(stderr,"out of memory\n");
Daniel Veillardb05deb71999-08-10 19:04:08 +00001482 return(NULL);
Daniel Veillard14fff061999-06-22 21:49:07 +00001483 }
1484 memset(ret, 0, sizeof(job));
1485
1486 /* We don't care what the top level element name is */
Daniel Veillard60979bd2000-07-10 12:17:33 +00001487 cur = cur-&gt;xmlChildrenNode;
Daniel Veillard14fff061999-06-22 21:49:07 +00001488 while (cur != NULL) {
1489
Daniel Veillard60979bd2000-07-10 12:17:33 +00001490 if ((!strcmp(cur-&gt;name, "Project")) &amp;&amp; (cur-&gt;ns == ns)) {
1491 ret-&gt;projectID = xmlGetProp(cur, "ID");
1492 if (ret-&gt;projectID == NULL) {
Daniel Veillardb05deb71999-08-10 19:04:08 +00001493 fprintf(stderr, "Project has no ID\n");
1494 }
1495 }
Daniel Veillard60979bd2000-07-10 12:17:33 +00001496 if ((!strcmp(cur-&gt;name, "Application")) &amp;&amp; (cur-&gt;ns == ns))
1497 ret-&gt;application = xmlNodeListGetString(doc, cur-&gt;xmlChildrenNode, 1);
1498 if ((!strcmp(cur-&gt;name, "Category")) &amp;&amp; (cur-&gt;ns == ns))
1499 ret-&gt;category = xmlNodeListGetString(doc, cur-&gt;xmlChildrenNode, 1);
1500 if ((!strcmp(cur-&gt;name, "Contact")) &amp;&amp; (cur-&gt;ns == ns))
1501 ret-&gt;contact = parsePerson(doc, ns, cur);
1502 cur = cur-&gt;next;
Daniel Veillard14fff061999-06-22 21:49:07 +00001503 }
1504
1505 return(ret);
Daniel Veillardb05deb71999-08-10 19:04:08 +00001506}</pre>
Daniel Veillard14fff061999-06-22 21:49:07 +00001507
Daniel Veillardec70e912001-02-26 20:10:45 +00001508<p>Once you are used to it, writing this kind of code is quite simple, but
1509boring. Ultimately, it could be possble to write stubbers taking either C data
1510structure definitions, a set of XML examples or an XML DTD and produce the
1511code needed to import and export the content between C data and XML storage.
1512This is left as an exercise to the reader :-)</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001513
Daniel Veillard6f0adb52000-07-03 11:41:26 +00001514<p>Feel free to use <a href="example/gjobread.c">the code for the full C
1515parsing example</a> as a template, it is also available with Makefile in the
1516Gnome CVS base under gnome-xml/example</p>
Daniel Veillardb05deb71999-08-10 19:04:08 +00001517
Daniel Veillardc310d562000-06-23 18:32:15 +00001518<h2><a name="Contributi">Contributions</a></h2>
1519<ul>
Daniel Veillard851c59c2000-11-24 16:06:22 +00001520 <li><a href="mailto:ari@lusis.org">Ari Johnson</a> provides a C++ wrapper
Daniel Veillardc310d562000-06-23 18:32:15 +00001521 for libxml:
1522 <p>Website: <a
1523 href="http://lusis.org/~ari/xml++/">http://lusis.org/~ari/xml++/</a></p>
1524 <p>Download: <a
1525 href="http://lusis.org/~ari/xml++/libxml++.tar.gz">http://lusis.org/~ari/xml++/libxml++.tar.gz</a></p>
1526 </li>
1527 <li><a href="mailto:doolin@cs.utk.edu">David Doolin</a> provides a
1528 precompiled Windows version
1529 <p><a
1530 href="http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/">http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/</a></p>
1531 </li>
Daniel Veillarde356c282001-03-10 12:32:04 +00001532 <li><a
1533 href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
1534 Sergeant</a> developped <a
1535 href="http://axkit.org/download/">XML::LibXSLT</a>, a perl wrapper for
1536 libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML
1537 application server</a></li>
Daniel Veillard3f6f7f62000-06-30 17:58:25 +00001538 <li><a href="mailto:fnatter@gmx.net">Felix Natter</a> provided <a
1539 href="libxml-doc.el">an emacs module</a> to lookup libxml functions
1540 documentation</li>
Daniel Veillardc310d562000-06-23 18:32:15 +00001541 <li><a href="mailto:sherwin@nlm.nih.gov">Ziying Sherwin</a> provided <a
1542 href="http://xmlsoft.org/messages/0488.html">man pages</a> (not yet
1543 integrated in the distribution)</li>
1544</ul>
1545
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001546<p></p>
1547
Daniel Veillard33a67802001-03-07 09:44:02 +00001548<p><a href="mailto:Daniel.Veillard@imag.fr">Daniel Veillard</a></p>
Daniel Veillardc8eab3a1999-09-04 18:27:23 +00001549
Daniel Veillard4623acd2001-05-19 15:13:15 +00001550<p>$Id: xml.html,v 1.83 2001/05/14 11:13:58 veillard Exp $</p>
Daniel Veillardccb09631998-10-27 06:21:04 +00001551</body>
1552</html>