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9: <h1 align="center">The XML C parser and toolkit of Gnome</h1>
10:
11: <h1>Note: this is the flat content of the <a href="index.html">web
12: site</a></h1>
13:
14: <h1 style="text-align: center">libxml, a.k.a. gnome-xml</h1>
15:
16: <p></p>
17:
18: <p
19: style="text-align: right; font-style: italic; font-size: 10pt">"Programming
20: with libxml2 is like the thrilling embrace of an exotic stranger." <a
21: href="http://diveintomark.org/archives/2004/02/18/libxml2">Mark
22: Pilgrim</a></p>
23:
24: <p>Libxml2 is the XML C parser and toolkit developed for the Gnome project
25: (but usable outside of the Gnome platform), it is free software available
26: under the <a href="http://www.opensource.org/licenses/mit-license.html">MIT
27: License</a>. XML itself is a metalanguage to design markup languages, i.e.
28: text language where semantic and structure are added to the content using
29: extra "markup" information enclosed between angle brackets. HTML is the most
30: well-known markup language. Though the library is written in C <a
31: href="python.html">a variety of language bindings</a> make it available in
32: other environments.</p>
33:
34: <p>Libxml2 is known to be very portable, the library should build and work
35: without serious troubles on a variety of systems (Linux, Unix, Windows,
36: CygWin, MacOS, MacOS X, RISC Os, OS/2, VMS, QNX, MVS, VxWorks, ...)</p>
37:
38: <p>Libxml2 implements a number of existing standards related to markup
39: languages:</p>
40: <ul>
41: <li>the XML standard: <a
42: href="http://www.w3.org/TR/REC-xml">http://www.w3.org/TR/REC-xml</a></li>
43: <li>Namespaces in XML: <a
44: href="http://www.w3.org/TR/REC-xml-names/">http://www.w3.org/TR/REC-xml-names/</a></li>
45: <li>XML Base: <a
46: href="http://www.w3.org/TR/xmlbase/">http://www.w3.org/TR/xmlbase/</a></li>
47: <li><a href="http://www.cis.ohio-state.edu/rfc/rfc2396.txt">RFC 2396</a> :
48: Uniform Resource Identifiers <a
49: href="http://www.ietf.org/rfc/rfc2396.txt">http://www.ietf.org/rfc/rfc2396.txt</a></li>
50: <li>XML Path Language (XPath) 1.0: <a
51: href="http://www.w3.org/TR/xpath">http://www.w3.org/TR/xpath</a></li>
52: <li>HTML4 parser: <a
53: href="http://www.w3.org/TR/html401/">http://www.w3.org/TR/html401/</a></li>
54: <li>XML Pointer Language (XPointer) Version 1.0: <a
55: href="http://www.w3.org/TR/xptr">http://www.w3.org/TR/xptr</a></li>
56: <li>XML Inclusions (XInclude) Version 1.0: <a
57: href="http://www.w3.org/TR/xinclude/">http://www.w3.org/TR/xinclude/</a></li>
58: <li>ISO-8859-x encodings, as well as <a
59: href="http://www.cis.ohio-state.edu/rfc/rfc2044.txt">rfc2044</a> [UTF-8]
60: and <a href="http://www.cis.ohio-state.edu/rfc/rfc2781.txt">rfc2781</a>
61: [UTF-16] Unicode encodings, and more if using iconv support</li>
62: <li>part of SGML Open Technical Resolution TR9401:1997</li>
63: <li>XML Catalogs Working Draft 06 August 2001: <a
64: href="http://www.oasis-open.org/committees/entity/spec-2001-08-06.html">http://www.oasis-open.org/committees/entity/spec-2001-08-06.html</a></li>
65: <li>Canonical XML Version 1.0: <a
66: href="http://www.w3.org/TR/xml-c14n">http://www.w3.org/TR/xml-c14n</a>
67: and the Exclusive XML Canonicalization CR draft <a
68: href="http://www.w3.org/TR/xml-exc-c14n">http://www.w3.org/TR/xml-exc-c14n</a></li>
69: <li>Relax NG, ISO/IEC 19757-2:2003, <a
70: href="http://www.oasis-open.org/committees/relax-ng/spec-20011203.html">http://www.oasis-open.org/committees/relax-ng/spec-20011203.html</a></li>
71: <li>W3C XML Schemas Part 2: Datatypes <a
72: href="http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/">REC 02 May
73: 2001</a></li>
74: <li>W3C <a href="http://www.w3.org/TR/xml-id/">xml:id</a> Working Draft 7
75: April 2004</li>
76: </ul>
77:
78: <p>In most cases libxml2 tries to implement the specifications in a
79: relatively strictly compliant way. As of release 2.4.16, libxml2 passed all
80: 1800+ tests from the <a
81: href="http://www.oasis-open.org/committees/xml-conformance/">OASIS XML Tests
82: Suite</a>.</p>
83:
84: <p>To some extent libxml2 provides support for the following additional
85: specifications but doesn't claim to implement them completely:</p>
86: <ul>
87: <li>Document Object Model (DOM) <a
88: href="http://www.w3.org/TR/DOM-Level-2-Core/">http://www.w3.org/TR/DOM-Level-2-Core/</a>
89: the document model, but it doesn't implement the API itself, gdome2 does
90: this on top of libxml2</li>
91: <li><a href="http://www.cis.ohio-state.edu/rfc/rfc959.txt">RFC 959</a> :
92: libxml2 implements a basic FTP client code</li>
93: <li><a href="http://www.cis.ohio-state.edu/rfc/rfc1945.txt">RFC 1945</a> :
94: HTTP/1.0, again a basic HTTP client code</li>
95: <li>SAX: a SAX2 like interface and a minimal SAX1 implementation compatible
96: with early expat versions</li>
97: </ul>
98:
99: <p>A partial implementation of <a
100: href="http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/">XML Schemas Part
101: 1: Structure</a> is being worked on but it would be far too early to make any
102: conformance statement about it at the moment.</p>
103:
104: <p>Separate documents:</p>
105: <ul>
106: <li><a href="http://xmlsoft.org/XSLT/">the libxslt page</a> providing an
107: implementation of XSLT 1.0 and common extensions like EXSLT for
108: libxml2</li>
109: <li><a href="http://gdome2.cs.unibo.it/">the gdome2 page</a>
110: : a standard DOM2 implementation for libxml2</li>
111: <li><a href="http://www.aleksey.com/xmlsec/">the XMLSec page</a>: an
112: implementation of <a href="http://www.w3.org/TR/xmldsig-core/">W3C XML
113: Digital Signature</a> for libxml2</li>
114: <li>also check the related links section for more related and active
115: projects.</li>
116: </ul>
117: <p> Hosting sponsored by <a href="http://www.aoemedia.de/opensource-cms.html"
118: >Open Source CMS services</a> from AOE media.</p>
119:
120: <p>Logo designed by <a href="mailto:liyanage@access.ch">Marc Liyanage</a>.</p>
121:
122: <h2><a name="Introducti">Introduction</a></h2>
123:
124: <p>This document describes libxml, the <a
125: href="http://www.w3.org/XML/">XML</a> C parser and toolkit developed for the
126: <a href="http://www.gnome.org/">Gnome</a> project. <a
127: href="http://www.w3.org/XML/">XML is a standard</a> for building tag-based
128: structured documents/data.</p>
129:
130: <p>Here are some key points about libxml:</p>
131: <ul>
132: <li>Libxml2 exports Push (progressive) and Pull (blocking) type parser
133: interfaces for both XML and HTML.</li>
134: <li>Libxml2 can do DTD validation at parse time, using a parsed document
135: instance, or with an arbitrary DTD.</li>
136: <li>Libxml2 includes complete <a
137: href="http://www.w3.org/TR/xpath">XPath</a>, <a
138: href="http://www.w3.org/TR/xptr">XPointer</a> and <a
139: href="http://www.w3.org/TR/xinclude">XInclude</a> implementations.</li>
140: <li>It is written in plain C, making as few assumptions as possible, and
141: sticking closely to ANSI C/POSIX for easy embedding. Works on
142: Linux/Unix/Windows, ported to a number of other platforms.</li>
143: <li>Basic support for HTTP and FTP client allowing applications to fetch
144: remote resources.</li>
145: <li>The design is modular, most of the extensions can be compiled out.</li>
146: <li>The internal document representation is as close as possible to the <a
147: href="http://www.w3.org/DOM/">DOM</a> interfaces.</li>
148: <li>Libxml2 also has a <a
149: href="http://www.megginson.com/SAX/index.html">SAX like interface</a>;
150: the interface is designed to be compatible with <a
151: href="http://www.jclark.com/xml/expat.html">Expat</a>.</li>
152: <li>This library is released under the <a
153: href="http://www.opensource.org/licenses/mit-license.html">MIT
154: License</a>. See the Copyright file in the distribution for the precise
155: wording.</li>
156: </ul>
157:
158: <p>Warning: unless you are forced to because your application links with a
159: Gnome-1.X library requiring it, <strong><span
160: style="background-color: #FF0000">Do Not Use libxml1</span></strong>, use
161: libxml2</p>
162:
163: <h2><a name="FAQ">FAQ</a></h2>
164:
165: <p>Table of Contents:</p>
166: <ul>
167: <li><a href="FAQ.html#License">License(s)</a></li>
168: <li><a href="FAQ.html#Installati">Installation</a></li>
169: <li><a href="FAQ.html#Compilatio">Compilation</a></li>
170: <li><a href="FAQ.html#Developer">Developer corner</a></li>
171: </ul>
172:
173: <h3><a name="License">License</a>(s)</h3>
174: <ol>
175: <li><em>Licensing Terms for libxml</em>
176: <p>libxml2 is released under the <a
177: href="http://www.opensource.org/licenses/mit-license.html">MIT
178: License</a>; see the file Copyright in the distribution for the precise
179: wording</p>
180: </li>
181: <li><em>Can I embed libxml2 in a proprietary application ?</em>
182: <p>Yes. The MIT License allows you to keep proprietary the changes you
183: made to libxml, but it would be graceful to send-back bug fixes and
184: improvements as patches for possible incorporation in the main
185: development tree.</p>
186: </li>
187: </ol>
188:
189: <h3><a name="Installati">Installation</a></h3>
190: <ol>
191: <li><strong><span style="background-color: #FF0000">Do Not Use
192: libxml1</span></strong>, use libxml2</li>
193: <p></p>
194: <li><em>Where can I get libxml</em> ?
195: <p>The original distribution comes from <a
196: href="ftp://xmlsoft.org/libxml2/">xmlsoft.org</a> or <a
197: href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.6/">gnome.org</a></p>
198: <p>Most Linux and BSD distributions include libxml, this is probably the
199: safer way for end-users to use libxml.</p>
200: <p>David Doolin provides precompiled Windows versions at <a
201: href="http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/ ">http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/</a></p>
202: </li>
203: <p></p>
204: <li><em>I see libxml and libxml2 releases, which one should I install ?</em>
205: <ul>
206: <li>If you are not constrained by backward compatibility issues with
207: existing applications, install libxml2 only</li>
208: <li>If you are not doing development, you can safely install both.
209: Usually the packages <a
210: href="http://rpmfind.net/linux/RPM/libxml.html">libxml</a> and <a
211: href="http://rpmfind.net/linux/RPM/libxml2.html">libxml2</a> are
212: compatible (this is not the case for development packages).</li>
213: <li>If you are a developer and your system provides separate packaging
214: for shared libraries and the development components, it is possible
215: to install libxml and libxml2, and also <a
216: href="http://rpmfind.net/linux/RPM/libxml-devel.html">libxml-devel</a>
217: and <a
218: href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml2-devel</a>
219: too for libxml2 >= 2.3.0</li>
220: <li>If you are developing a new application, please develop against
221: libxml2(-devel)</li>
222: </ul>
223: </li>
224: <li><em>I can't install the libxml package, it conflicts with libxml0</em>
225: <p>You probably have an old libxml0 package used to provide the shared
226: library for libxml.so.0, you can probably safely remove it. The libxml
227: packages provided on <a
228: href="ftp://xmlsoft.org/libxml2/">xmlsoft.org</a> provide
229: libxml.so.0</p>
230: </li>
231: <li><em>I can't install the libxml(2) RPM package due to failed
232: dependencies</em>
233: <p>The most generic solution is to re-fetch the latest src.rpm , and
234: rebuild it locally with</p>
235: <p><code>rpm --rebuild libxml(2)-xxx.src.rpm</code>.</p>
236: <p>If everything goes well it will generate two binary rpm packages (one
237: providing the shared libs and xmllint, and the other one, the -devel
238: package, providing includes, static libraries and scripts needed to build
239: applications with libxml(2)) that you can install locally.</p>
240: </li>
241: </ol>
242:
243: <h3><a name="Compilatio">Compilation</a></h3>
244: <ol>
245: <li><em>What is the process to compile libxml2 ?</em>
246: <p>As most UNIX libraries libxml2 follows the "standard":</p>
247: <p><code>gunzip -c xxx.tar.gz | tar xvf -</code></p>
248: <p><code>cd libxml-xxxx</code></p>
249: <p><code>./configure --help</code></p>
250: <p>to see the options, then the compilation/installation proper</p>
251: <p><code>./configure [possible options]</code></p>
252: <p><code>make</code></p>
253: <p><code>make install</code></p>
254: <p>At that point you may have to rerun ldconfig or a similar utility to
255: update your list of installed shared libs.</p>
256: </li>
257: <li><em>What other libraries are needed to compile/install libxml2 ?</em>
258: <p>Libxml2 does not require any other library, the normal C ANSI API
259: should be sufficient (please report any violation to this rule you may
260: find).</p>
261: <p>However if found at configuration time libxml2 will detect and use the
262: following libs:</p>
263: <ul>
264: <li><a href="http://www.info-zip.org/pub/infozip/zlib/">libz</a> : a
265: highly portable and available widely compression library.</li>
266: <li>iconv: a powerful character encoding conversion library. It is
267: included by default in recent glibc libraries, so it doesn't need to
268: be installed specifically on Linux. It now seems a <a
269: href="http://www.opennc.org/onlinepubs/7908799/xsh/iconv.html">part
270: of the official UNIX</a> specification. Here is one <a
271: href="http://www.gnu.org/software/libiconv/">implementation of the
272: library</a> which source can be found <a
273: href="ftp://ftp.ilog.fr/pub/Users/haible/gnu/">here</a>.</li>
274: </ul>
275: </li>
276: <p></p>
277: <li><em>Make check fails on some platforms</em>
278: <p>Sometimes the regression tests' results don't completely match the
279: value produced by the parser, and the makefile uses diff to print the
280: delta. On some platforms the diff return breaks the compilation process;
281: if the diff is small this is probably not a serious problem.</p>
282: <p>Sometimes (especially on Solaris) make checks fail due to limitations
283: in make. Try using GNU-make instead.</p>
284: </li>
285: <li><em>I use the SVN version and there is no configure script</em>
286: <p>The configure script (and other Makefiles) are generated. Use the
287: autogen.sh script to regenerate the configure script and Makefiles,
288: like:</p>
289: <p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
290: </li>
291: <li><em>I have troubles when running make tests with gcc-3.0</em>
292: <p>It seems the initial release of gcc-3.0 has a problem with the
293: optimizer which miscompiles the URI module. Please use another
294: compiler.</p>
295: </li>
296: </ol>
297:
298: <h3><a name="Developer">Developer</a> corner</h3>
299: <ol>
300: <li><em>Troubles compiling or linking programs using libxml2</em>
301: <p>Usually the problem comes from the fact that the compiler doesn't get
302: the right compilation or linking flags. There is a small shell script
303: <code>xml2-config</code> which is installed as part of libxml2 usual
304: install process which provides those flags. Use</p>
305: <p><code>xml2-config --cflags</code></p>
306: <p>to get the compilation flags and</p>
307: <p><code>xml2-config --libs</code></p>
308: <p>to get the linker flags. Usually this is done directly from the
309: Makefile as:</p>
310: <p><code>CFLAGS=`xml2-config --cflags`</code></p>
311: <p><code>LIBS=`xml2-config --libs`</code></p>
312: </li>
313: <li><em>I want to install my own copy of libxml2 in my home directory and
314: link my programs against it, but it doesn't work</em>
315: <p>There are many different ways to accomplish this. Here is one way to
316: do this under Linux. Suppose your home directory is <code>/home/user.
317: </code>Then:</p>
318: <ul>
319: <li>Create a subdirectory, let's call it <code>myxml</code></li>
320: <li>unpack the libxml2 distribution into that subdirectory</li>
321: <li>chdir into the unpacked distribution
322: (<code>/home/user/myxml/libxml2 </code>)</li>
323: <li>configure the library using the "<code>--prefix</code>" switch,
324: specifying an installation subdirectory in
325: <code>/home/user/myxml</code>, e.g.
326: <p><code>./configure --prefix /home/user/myxml/xmlinst</code> {other
327: configuration options}</p>
328: </li>
329: <li>now run <code>make</code> followed by <code>make install</code></li>
330: <li>At this point, the installation subdirectory contains the complete
331: "private" include files, library files and binary program files (e.g.
332: xmllint), located in
333: <p><code>/home/user/myxml/xmlinst/lib,
334: /home/user/myxml/xmlinst/include </code> and <code>
335: /home/user/myxml/xmlinst/bin</code></p>
336: respectively.</li>
337: <li>In order to use this "private" library, you should first add it to
338: the beginning of your default PATH (so that your own private program
339: files such as xmllint will be used instead of the normal system
340: ones). To do this, the Bash command would be
341: <p><code>export PATH=/home/user/myxml/xmlinst/bin:$PATH</code></p>
342: </li>
343: <li>Now suppose you have a program <code>test1.c</code> that you would
344: like to compile with your "private" library. Simply compile it using
345: the command
346: <p><code>gcc `xml2-config --cflags --libs` -o test test.c</code></p>
347: Note that, because your PATH has been set with <code>
348: /home/user/myxml/xmlinst/bin</code> at the beginning, the xml2-config
349: program which you just installed will be used instead of the system
350: default one, and this will <em>automatically</em> get the correct
351: libraries linked with your program.</li>
352: </ul>
353: </li>
354:
355: <p></p>
356: <li><em>xmlDocDump() generates output on one line.</em>
357: <p>Libxml2 will not <strong>invent</strong> spaces in the content of a
358: document since <strong>all spaces in the content of a document are
359: significant</strong>. If you build a tree from the API and want
360: indentation:</p>
361: <ol>
362: <li>the correct way is to generate those yourself too.</li>
363: <li>the dangerous way is to ask libxml2 to add those blanks to your
364: content <strong>modifying the content of your document in the
365: process</strong>. The result may not be what you expect. There is
366: <strong>NO</strong> way to guarantee that such a modification won't
367: affect other parts of the content of your document. See <a
368: href="http://xmlsoft.org/html/libxml-parser.html#xmlKeepBlanksDefault">xmlKeepBlanksDefault
369: ()</a> and <a
370: href="http://xmlsoft.org/html/libxml-tree.html#xmlSaveFormatFile">xmlSaveFormatFile
371: ()</a></li>
372: </ol>
373: </li>
374: <p></p>
375: <li><em>Extra nodes in the document:</em>
376: <p><em>For an XML file as below:</em></p>
377: <pre><?xml version="1.0"?>
378: <PLAN xmlns="http://www.argus.ca/autotest/1.0/">
379: <NODE CommFlag="0"/>
380: <NODE CommFlag="1"/>
381: </PLAN></pre>
382: <p><em>after parsing it with the function
383: pxmlDoc=xmlParseFile(...);</em></p>
384: <p><em>I want to the get the content of the first node (node with the
385: CommFlag="0")</em></p>
386: <p><em>so I did it as following;</em></p>
387: <pre>xmlNodePtr pnode;
388: pnode=pxmlDoc->children->children;</pre>
389: <p><em>but it does not work. If I change it to</em></p>
390: <pre>pnode=pxmlDoc->children->children->next;</pre>
391: <p><em>then it works. Can someone explain it to me.</em></p>
392: <p></p>
393: <p>In XML all characters in the content of the document are significant
394: <strong>including blanks and formatting line breaks</strong>.</p>
395: <p>The extra nodes you are wondering about are just that, text nodes with
396: the formatting spaces which are part of the document but that people tend
397: to forget. There is a function <a
398: href="http://xmlsoft.org/html/libxml-parser.html">xmlKeepBlanksDefault
399: ()</a> to remove those at parse time, but that's an heuristic, and its
400: use should be limited to cases where you are certain there is no
401: mixed-content in the document.</p>
402: </li>
403: <li><em>I get compilation errors of existing code like when accessing
404: <strong>root</strong> or <strong>child fields</strong> of nodes.</em>
405: <p>You are compiling code developed for libxml version 1 and using a
406: libxml2 development environment. Either switch back to libxml v1 devel or
407: even better fix the code to compile with libxml2 (or both) by <a
408: href="upgrade.html">following the instructions</a>.</p>
409: </li>
410: <li><em>I get compilation errors about non existing
411: <strong>xmlRootNode</strong> or <strong>xmlChildrenNode</strong>
412: fields.</em>
413: <p>The source code you are using has been <a
414: href="upgrade.html">upgraded</a> to be able to compile with both libxml
415: and libxml2, but you need to install a more recent version:
416: libxml(-devel) >= 1.8.8 or libxml2(-devel) >= 2.1.0</p>
417: </li>
418: <li><em>Random crashes in threaded applications</em>
419: <p>Read and follow all advices on the <a href="threads.html">thread
420: safety</a> page, and make 100% sure you never call xmlCleanupParser()
421: while the library or an XML document might still be in use by another
422: thread.</p>
423: </li>
424: <li><em>The example provided in the web page does not compile.</em>
425: <p>It's hard to maintain the documentation in sync with the code
426: <grin/> ...</p>
427: <p>Check the previous points 1/ and 2/ raised before, and please send
428: patches.</p>
429: </li>
430: <li><em>Where can I get more examples and information than provided on the
431: web page?</em>
432: <p>Ideally a libxml2 book would be nice. I have no such plan ... But you
433: can:</p>
434: <ul>
435: <li>check more deeply the <a href="html/libxml-lib.html">existing
436: generated doc</a></li>
437: <li>have a look at <a href="examples/index.html">the set of
438: examples</a>.</li>
439: <li>look for examples of use for libxml2 function using the Gnome code
440: or by asking on Google.</li>
441: <li><a
442: href="http://svn.gnome.org/viewvc/libxml2/trunk/">Browse
443: the libxml2 source</a> , I try to write code as clean and documented
444: as possible, so looking at it may be helpful. In particular the code
445: of <a href="http://svn.gnome.org/viewvc/libxml2/trunk/xmllint.c?view=markup">xmllint.c</a> and of the various testXXX.c test programs should
446: provide good examples of how to do things with the library.</li>
447: </ul>
448: </li>
449: <p></p>
450: <li><em>What about C++ ?</em>
451: <p>libxml2 is written in pure C in order to allow easy reuse on a number
452: of platforms, including embedded systems. I don't intend to convert to
453: C++.</p>
454: <p>There is however a C++ wrapper which may fulfill your needs:</p>
455: <ul>
456: <li>by Ari Johnson <ari@btigate.com>:
457: <p>Website: <a
458: href="http://libxmlplusplus.sourceforge.net/">http://libxmlplusplus.sourceforge.net/</a></p>
459: <p>Download: <a
460: href="http://sourceforge.net/project/showfiles.php?group_id=12999">http://sourceforge.net/project/showfiles.php?group_id=12999</a></p>
461: </li>
462: </ul>
463: </li>
464: <li><em>How to validate a document a posteriori ?</em>
465: <p>It is possible to validate documents which had not been validated at
466: initial parsing time or documents which have been built from scratch
467: using the API. Use the <a
468: href="http://xmlsoft.org/html/libxml-valid.html#xmlValidateDtd">xmlValidateDtd()</a>
469: function. It is also possible to simply add a DTD to an existing
470: document:</p>
471: <pre>xmlDocPtr doc; /* your existing document */
472: xmlDtdPtr dtd = xmlParseDTD(NULL, filename_of_dtd); /* parse the DTD */
473:
474: dtd->name = xmlStrDup((xmlChar*)"root_name"); /* use the given root */
475:
476: doc->intSubset = dtd;
477: if (doc->children == NULL) xmlAddChild((xmlNodePtr)doc, (xmlNodePtr)dtd);
478: else xmlAddPrevSibling(doc->children, (xmlNodePtr)dtd);
479: </pre>
480: </li>
481: <li><em>So what is this funky "xmlChar" used all the time?</em>
482: <p>It is a null terminated sequence of utf-8 characters. And only utf-8!
483: You need to convert strings encoded in different ways to utf-8 before
484: passing them to the API. This can be accomplished with the iconv library
485: for instance.</p>
486: </li>
487: <li>etc ...</li>
488: </ol>
489:
490: <p></p>
491:
492: <h2><a name="Documentat">Developer Menu</a></h2>
493:
494: <p>There are several on-line resources related to using libxml:</p>
495: <ol>
496: <li>Use the <a href="search.php">search engine</a> to look up
497: information.</li>
498: <li>Check the <a href="FAQ.html">FAQ.</a></li>
499: <li>Check the <a href="http://xmlsoft.org/html/libxml-lib.html">extensive
500: documentation</a> automatically extracted from code comments.</li>
501: <li>Look at the documentation about <a href="encoding.html">libxml
502: internationalization support</a>.</li>
503: <li>This page provides a global overview and <a href="example.html">some
504: examples</a> on how to use libxml.</li>
505: <li><a href="examples/index.html">Code examples</a></li>
506: <li>John Fleck's libxml2 tutorial: <a href="tutorial/index.html">html</a>
507: or <a href="tutorial/xmltutorial.pdf">pdf</a>.</li>
508: <li>If you need to parse large files, check the <a
509: href="xmlreader.html">xmlReader</a> API tutorial</li>
510: <li><a href="mailto:james@daa.com.au">James Henstridge</a> wrote <a
511: href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">some nice
512: documentation</a> explaining how to use the libxml SAX interface.</li>
513: <li>George Lebl wrote <a
514: href="http://www-106.ibm.com/developerworks/library/l-gnome3/">an article
515: for IBM developerWorks</a> about using libxml.</li>
516: <li>Check <a href="http://svn.gnome.org/viewvc/libxml2/trunk/TODO?view=markup">the TODO
517: file</a>.</li>
518: <li>Read the <a href="upgrade.html">1.x to 2.x upgrade path</a>
519: description. If you are starting a new project using libxml you should
520: really use the 2.x version.</li>
521: <li>And don't forget to look at the <a
522: href="http://mail.gnome.org/archives/xml/">mailing-list archive</a>.</li>
523: </ol>
524:
525: <h2><a name="Reporting">Reporting bugs and getting help</a></h2>
526:
527: <p>Well, bugs or missing features are always possible, and I will make a
528: point of fixing them in a timely fashion. The best way to report a bug is to
529: use the <a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">Gnome
530: bug tracking database</a> (make sure to use the "libxml2" module name). I
531: look at reports there regularly and it's good to have a reminder when a bug
532: is still open. Be sure to specify that the bug is for the package libxml2.</p>
533:
534: <p>For small problems you can try to get help on IRC, the #xml channel on
535: irc.gnome.org (port 6667) usually have a few person subscribed which may help
536: (but there is no guarantee and if a real issue is raised it should go on the
537: mailing-list for archival).</p>
538:
539: <p>There is also a mailing-list <a
540: href="mailto:xml@gnome.org">xml@gnome.org</a> for libxml, with an <a
541: href="http://mail.gnome.org/archives/xml/">on-line archive</a> (<a
542: href="http://xmlsoft.org/messages">old</a>). To subscribe to this list,
543: please visit the <a
544: href="http://mail.gnome.org/mailman/listinfo/xml">associated Web</a> page and
545: follow the instructions. <strong>Do not send code, I won't debug it</strong>
546: (but patches are really appreciated!).</p>
547:
548: <p>Please note that with the current amount of virus and SPAM, sending mail
549: to the list without being subscribed won't work. There is *far too many
550: bounces* (in the order of a thousand a day !) I cannot approve them manually
551: anymore. If your mail to the list bounced waiting for administrator approval,
552: it is LOST ! Repost it and fix the problem triggering the error. Also please
553: note that <span style="color: #FF0000; background-color: #FFFFFF">emails with
554: a legal warning asking to not copy or redistribute freely the information
555: they contain</span> are <strong>NOT</strong> acceptable for the mailing-list,
556: such mail will as much as possible be discarded automatically, and are less
557: likely to be answered if they made it to the list, <strong>DO NOT</strong>
558: post to the list from an email address where such legal requirements are
559: automatically added, get private paying support if you can't share
560: information.</p>
561:
562: <p>Check the following <strong><span style="color: #FF0000">before
563: posting</span></strong>:</p>
564: <ul>
565: <li>Read the <a href="FAQ.html">FAQ</a> and <a href="search.php">use the
566: search engine</a> to get information related to your problem.</li>
567: <li>Make sure you are <a href="ftp://xmlsoft.org/libxml2/">using a recent
568: version</a>, and that the problem still shows up in a recent version.</li>
569: <li>Check the <a href="http://mail.gnome.org/archives/xml/">list
570: archives</a> to see if the problem was reported already. In this case
571: there is probably a fix available, similarly check the <a
572: href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">registered
573: open bugs</a>.</li>
574: <li>Make sure you can reproduce the bug with xmllint or one of the test
575: programs found in source in the distribution.</li>
576: <li>Please send the command showing the error as well as the input (as an
577: attachment)</li>
578: </ul>
579:
580: <p>Then send the bug with associated information to reproduce it to the <a
581: href="mailto:xml@gnome.org">xml@gnome.org</a> list; if it's really libxml
582: related I will approve it. Please do not send mail to me directly, it makes
583: things really hard to track and in some cases I am not the best person to
584: answer a given question, ask on the list.</p>
585:
586: <p>To <span style="color: #E50000">be really clear about support</span>:</p>
587: <ul>
588: <li>Support or help <span style="color: #E50000">requests MUST be sent to
589: the list or on bugzilla</span> in case of problems, so that the Question
590: and Answers can be shared publicly. Failing to do so carries the implicit
591: message "I want free support but I don't want to share the benefits with
592: others" and is not welcome. I will automatically Carbon-Copy the
593: xml@gnome.org mailing list for any technical reply made about libxml2 or
594: libxslt.</li>
595: <li>There is <span style="color: #E50000">no guarantee of support</span>. If
596: your question remains unanswered after a week, repost it, making sure you
597: gave all the detail needed and the information requested.</li>
598: <li>Failing to provide information as requested or double checking first
599: for prior feedback also carries the implicit message "the time of the
600: library maintainers is less valuable than my time" and might not be
601: welcome.</li>
602: </ul>
603:
604: <p>Of course, bugs reported with a suggested patch for fixing them will
605: probably be processed faster than those without.</p>
606:
607: <p>If you're looking for help, a quick look at <a
608: href="http://mail.gnome.org/archives/xml/">the list archive</a> may actually
609: provide the answer. I usually send source samples when answering libxml2
610: usage questions. The <a
611: href="http://xmlsoft.org/html/book1.html">auto-generated documentation</a> is
612: not as polished as I would like (i need to learn more about DocBook), but
613: it's a good starting point.</p>
614:
615: <h2><a name="help">How to help</a></h2>
616:
617: <p>You can help the project in various ways, the best thing to do first is to
618: subscribe to the mailing-list as explained before, check the <a
619: href="http://mail.gnome.org/archives/xml/">archives </a>and the <a
620: href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">Gnome bug
621: database</a>:</p>
622: <ol>
623: <li>Provide patches when you find problems.</li>
624: <li>Provide the diffs when you port libxml2 to a new platform. They may not
625: be integrated in all cases but help pinpointing portability problems
626: and</li>
627: <li>Provide documentation fixes (either as patches to the code comments or
628: as HTML diffs).</li>
629: <li>Provide new documentations pieces (translations, examples, etc
630: ...).</li>
631: <li>Check the TODO file and try to close one of the items.</li>
632: <li>Take one of the points raised in the archive or the bug database and
633: provide a fix. <a href="mailto:daniel@veillard.com">Get in touch with me
634: </a>before to avoid synchronization problems and check that the suggested
635: fix will fit in nicely :-)</li>
636: </ol>
637:
638: <h2><a name="Downloads">Downloads</a></h2>
639:
640: <p>The latest versions of libxml2 can be found on the <a
641: href="ftp://xmlsoft.org/libxml2/">xmlsoft.org</a> server ( <a
642: href="ftp://xmlsoft.org/libxml2/">FTP</a> and rsync are available), there are also
643: mirrors (<a href="ftp://fr.rpmfind.net/pub/libxml/">France</a> and
644: Antonin Sprinzl also provide <a href="ftp://gd.tuwien.ac.at/pub/libxml/">a
645: mirror in Austria</a>). (NOTE that you need both the <a
646: href="http://rpmfind.net/linux/RPM/libxml2.html">libxml(2)</a> and <a
647: href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml(2)-devel</a>
648: packages installed to compile applications using libxml if using RPMs.)</p>
649:
650: <p>You can find all the history of libxml(2) and libxslt releases in the <a
651: href="http://xmlsoft.org/sources/old/">old</a> directory. The precompiled
652: Windows binaries made by Igor Zlatovic are available in the <a
653: href="http://xmlsoft.org/sources/win32/">win32</a> directory.</p>
654:
655: <p>Binary ports:</p>
656: <ul>
657: <li>RPMs for x86_64 are available directly on <a
658: href="ftp://xmlsoft.org/libxml2/">xmlsoft.org</a>, the source RPM will compile on
659: any architecture supported.</li>
660: <li><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a> is now the
661: maintainer of the Windows port, <a
662: href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
663: binaries</a>.</li>
664: <li>OpenCSW provides <a
665: href="http://opencsw.org/packages/libxml2">Solaris
666: binaries</a>.</li>
667: <li><a href="mailto:Steve.Ball@explain.com.au">Steve Ball</a> provides <a
668: href="http://www.explain.com.au/oss/libxml2xslt.html">Mac Os X
669: binaries</a>.</li>
670: <li>The HP-UX porting center provides <a
671: href="http://hpux.connect.org.uk/hppd/hpux/Gnome/">HP-UX binaries</a></li>
672: <li>Bull provides precompiled <a
673: href="http://gnome.bullfreeware.com/new_index.html">RPMs for AIX</a> as
674: patr of their GNOME packages</li>
675: </ul>
676:
677: <p>If you know other supported binary ports, please <a
678: href="http://veillard.com/">contact me</a>.</p>
679:
680: <p><a name="Snapshot">Snapshot:</a></p>
681: <ul>
682: <li>Code from the GNOME GIT base libxml2 module, updated hourly <a
683: href="ftp://xmlsoft.org/libxml2/libxml2-git-snapshot.tar.gz">libxml2-git-snapshot.tar.gz</a>.</li>
684: <li>Docs, content of the web site, the list archive included <a
685: href="ftp://xmlsoft.org/libxml2/libxml-docs.tar.gz">libxml-docs.tar.gz</a>.</li>
686: </ul>
687:
688: <p><a name="Contribs">Contributions:</a></p>
689:
690: <p>I do accept external contributions, especially if compiling on another
691: platform, get in touch with the list to upload the package, wrappers for
692: various languages have been provided, and can be found in the <a
693: href="python.html">bindings section</a></p>
694:
695: <p>Libxml2 is also available from GIT:</p>
696: <ul>
1.1.1.2 ! misho 697: <li><p>See <a href="http://git.gnome.org/browse/libxml2/">libxml2 Git web</a>.
1.1 misho 698: To checkout a local tree use:</p>
699: <pre>git clone git://git.gnome.org/libxml2</pre>
700: </li>
1.1.1.2 ! misho 701: <li>The <strong>libxslt</strong> module is also present
! 702: <a href="http://git.gnome.org/browse/libxslt/">there</a>.</li>
1.1 misho 703: </ul>
704:
705: <h2><a name="News">Releases</a></h2>
706:
707: <p>Items not finished and worked on, get in touch with the list if you want
708: to help those</p>
709: <ul>
710: <li>More testing on RelaxNG</li>
711: <li>Finishing up <a href="http://www.w3.org/TR/xmlschema-1/">XML
712: Schemas</a></li>
713: </ul>
714:
715: <p>The <a href="ChangeLog.html">change log</a> describes the recents commits
716: to the <a href="http://svn.gnome.org/viewvc/libxml2/trunk/">SVN</a> code base.</p>
717:
718: <p>Here is the list of public releases:</p>
719:
1.1.1.2 ! misho 720: <h3>2.8.0: May 23 2012</h3>
! 721: <ul>
! 722: <li>Features:
! 723: - add lzma compression support (Anders F Bjorklund)
! 724: </li>
! 725:
! 726: <li>Documentation:
! 727: xmlcatalog: Add uri and delegateURI to possible add types in man page. (Ville Skyttä),
! 728: Update README.tests (Daniel Veillard),
! 729: URI handling code is not OOM resilient (Daniel Veillard),
! 730: Fix an error in comment (Daniel Veillard),
! 731: Fixed bug #617016 (Daniel Mustieles),
! 732: Fixed two typos in the README document (Daniel Neel),
! 733: add generated html files (Anders F Bjorklund),
! 734: Clarify the need to use xmlFreeNode after xmlUnlinkNode (Daniel Veillard),
! 735: Improve documentation a bit (Daniel Veillard),
! 736: Updated URL for lxml python bindings (Daniel Veillard)
! 737: </li>
! 738:
! 739: <li>Portability:
! 740: Restore code for Windows compilation (Daniel Veillard),
! 741: Remove git error message during configure (Christian Dywan),
! 742: xmllint: Build fix for endTimer if !defined(HAVE_GETTIMEOFDAY) (Patrick R. Gansterer),
! 743: remove a bashism in confgure.in (John Hein),
! 744: undef ERROR if already defined (Patrick R. Gansterer),
! 745: Fix library problems with mingw-w64 (Michael Cronenworth),
! 746: fix windows build. ifdef addition from bug 666491 makes no sense (Rob Richards),
! 747: prefer native threads on win32 (Sam Thursfield),
! 748: Allow to compile with Visual Studio 2010 (Thomas Lemm),
! 749: Fix mingw's snprintf configure check (Andoni Morales),
! 750: fixed a 64bit big endian issue (Marcus Meissner),
! 751: Fix portability failure if netdb.h lacks NO_ADDRESS (Daniel Veillard),
! 752: Fix windows build from lzma addition (Rob Richards),
! 753: autogen: Only check for libtoolize (Colin Walters),
! 754: Fix the Windows build files (Patrick von Reth),
! 755: 634846 Remove a linking option breaking Windows VC10 (Daniel Veillard),
! 756: 599241 fix an initialization problem on Win64 (Andrew W. Nosenko),
! 757: fix win build (Rob Richards)
! 758: </li>
! 759:
! 760: <li>Bug fixes:
! 761: Part for rand_r checking missing (Daniel Veillard),
! 762: Cleanup on randomization (Daniel Veillard),
! 763: Fix undefined reference in python module (Pacho Ramos),
! 764: Fix a race in xmlNewInputStream (Daniel Veillard),
! 765: Fix weird streaming RelaxNG errors (Noam),
! 766: Fix various bugs in new code raised by the API checking (Daniel Veillard),
! 767: Fix various problems with "make dist" (Daniel Veillard),
! 768: Fix a memory leak in the xzlib code (Daniel Veillard),
! 769: HTML parser error with <noscript> in the <head> (Denis Pauk),
! 770: XSD: optional element in complex type extension (Remi Gacogne),
! 771: Fix html serialization error and htmlSetMetaEncoding() (Daniel Veillard),
! 772: Fix a wrong return value in previous patch (Daniel Veillard),
! 773: Fix an uninitialized variable use (Daniel Veillard),
! 774: Fix a compilation problem with --minimum (Brandon Slack),
! 775: Remove redundant and ungarded include of resolv.h (Daniel Veillard),
! 776: xinclude with parse="text" does not use the entity loader (Shaun McCance),
! 777: Allow to parse 1 byte HTML files (Denis Pauk),
! 778: Patch that fixes the skipping of the HTML_PARSE_NOIMPLIED flag (Martin Schröder),
! 779: Avoid memory leak if xmlParserInputBufferCreateIO fails (Lin Yi-Li),
! 780: Prevent an infinite loop when dumping a node with encoding problems (Timothy Elliott),
! 781: xmlParseNodeInContext problems with an empty document (Tim Elliott),
! 782: HTML element position is not detected propperly (Pavel Andrejs),
! 783: Fix an off by one pointer access (Jüri Aedla),
! 784: Try to fix a problem with entities in SAX mode (Daniel Veillard),
! 785: Fix a crash with xmllint --path on empty results (Daniel Veillard),
! 786: Fixed bug #667946 (Daniel Mustieles),
! 787: Fix a logic error in Schemas Component Constraints (Ryan Sleevi),
! 788: Fix a wrong enum type use in Schemas Types (Nico Weber),
! 789: Fix SAX2 builder in case of undefined attributes namespace (Daniel Veillard),
! 790: Fix SAX2 builder in case of undefined element namespaces (Daniel Veillard),
! 791: fix reference to STDOUT_FILENO on MSVC (Tay Ray Chuan),
! 792: fix a pair of possible out of array char references (Daniel Veillard),
! 793: Fix an allocation error when copying entities (Daniel Veillard),
! 794: Make sure the parser returns when getting a Stop order (Chris Evans),
! 795: Fix some potential problems on reallocation failures(parser.c) (Xia Xinfeng),
! 796: Fix a schema type duration comparison overflow (Daniel Veillard),
! 797: Fix an unimplemented part in RNG value validation (Daniel Veillard),
! 798: Fix missing error status in XPath evaluation (Daniel Veillard),
! 799: Hardening of XPath evaluation (Daniel Veillard),
! 800: Fix an off by one error in encoding (Daniel Veillard),
! 801: Fix RELAX NG include bug #655288 (Shaun McCance),
! 802: Fix XSD validation bug #630130 (Toyoda Eizi),
! 803: Fix some potential problems on reallocation failures (Chris Evans),
! 804: __xmlRaiseError: fix use of the structured callback channel (Dmitry V. Levin),
! 805: __xmlRaiseError: fix the structured callback channel's data initialization (Dmitry V. Levin),
! 806: Fix memory corruption when xmlParseBalancedChunkMemoryInternal is called from xmlParseBalancedChunk (Rob Richards),
! 807: Small fix for previous commit (Daniel Veillard),
! 808: Fix a potential freeing error in XPath (Daniel Veillard),
! 809: Fix a potential memory access error (Daniel Veillard),
! 810: Reactivate the shared library versionning script (Daniel Veillard)
! 811: </li>
! 812:
! 813: <li>Improvements:
! 814: use mingw C99 compatible functions {v}snprintf instead those from MSVC runtime (Roumen Petrov),
! 815: New symbols added for the next release (Daniel Veillard),
! 816: xmlTextReader bails too quickly on error (Andy Lutomirski),
! 817: Use a hybrid allocation scheme in xmlNodeSetContent (Conrad Irwin),
! 818: Use buffers when constructing string node lists. (Conrad Irwin),
! 819: Add HTML parser support for HTML5 meta charset encoding declaration (Denis Pauk),
! 820: wrong message for double hyphen in comment XML error (Bryan Henderson),
! 821: Fix "make tst" to grab lzma lib too (Daniel Veillard),
! 822: Add "whereis" command to xmllint shell (Ryan),
! 823: Improve xmllint shell (Ryan),
! 824: add function xmlTextReaderRelaxNGValidateCtxt() (Noam Postavsky),
! 825: Add --system support to autogen.sh (Daniel Veillard),
! 826: Add hash randomization to hash and dict structures (Daniel Veillard),
! 827: included xzlib in dist (Anders F Bjorklund),
! 828: move xz/lzma helpers to separate included files (Anders F Bjorklund),
! 829: add generated devhelp files (Anders F Bjorklund),
! 830: add XML_WITH_LZMA to api (Anders F Bjorklund),
! 831: autogen.sh: Honor NOCONFIGURE environment variable (Colin Walters),
! 832: Improve the error report on undefined REFs (Daniel Veillard),
! 833: Add exception for new W3C PI xml-model (Daniel Veillard),
! 834: Add options to ignore the internal encoding (Daniel Veillard),
! 835: testapi: use the right type for the check (Stefan Kost),
! 836: various: handle return values of write calls (Stefan Kost),
! 837: testWriter: xmlTextWriterWriteFormatElement wants an int instead of a long int (Stefan Kost),
! 838: runxmlconf: update to latest testsuite version (Stefan Kost),
! 839: configure: add -Wno-long-long to CFLAGS (Stefan Kost),
! 840: configure: support silent automake rules if possible (Stefan Kost),
! 841: xmlmemory: add a cast as size_t has no portable printf modifier (Stefan Kost),
! 842: __xmlRaiseError: remove redundant schannel initialization (Dmitry V. Levin),
! 843: __xmlRaiseError: do cheap code check early (Dmitry V. Levin)
! 844: </li>
! 845:
! 846: <li>Cleanups:
! 847: Cleanups before 2.8.0-rc2 (Daniel Veillard),
! 848: Avoid an extra operation (Daniel Veillard),
! 849: Remove vestigial de-ANSI-fication support. (Javier Jardón),
! 850: autogen.sh: Fix typo (Javier Jardón),
! 851: Do not use unsigned but unsigned int (Daniel Veillard),
! 852: Remove two references to u_short (Daniel Veillard),
! 853: Fix -Wempty-body warning from clang (Nico Weber),
! 854: Cleanups of lzma support (Daniel Veillard),
! 855: Augment the list of ignored files (Daniel Veillard),
! 856: python: remove unused variable (Stefan Kost),
! 857: python: flag two unused args (Stefan Kost),
! 858: configure: acconfig.h is deprecated since autoconf-2.50 (Stefan Kost),
! 859: xpath: remove unused variable (Stefan Kost)
! 860: </li>
! 861: </ul>
1.1 misho 862: <h3>2.7.8: Nov 4 2010</h3>
863: <ul>
864: <li> Features:
865: 480323 add code to plug in ICU converters by default (Giuseppe Iuculano),
866: Add xmlSaveOption XML_SAVE_WSNONSIG (Adam Spragg)
867: </li>
868: <li> Documentation:
869: Fix devhelp documentation installation (Mike Hommey),
870: Fix web site encoding problems (Daniel Veillard),
871: Fix a couple of typo in HTML parser error messages (Michael Day),
872: Forgot to update the news page for 0.7.7 (Daniel Veillard)
873: </li>
874: <li> Portability:
875: 607273 Fix python detection on MSys/Windows (LRN),
876: 614087 Fix Socket API usage to allow Windows64 compilation (Ozkan Sezer),
877: Fix compilation with Clang (Koop Mast),
878: Fix Win32 build (Rob Richards)
879: </li>
880: <li> Bug Fixes:
881: 595789 fix a remaining potential Solaris problem (Daniel Veillard),
882: 617468 fix progressive HTML parsing with style using "'" (Denis Pauk),
883: 616478 Fix xmllint shell write command (Gwenn Kahz),
884: 614005 Possible erroneous HTML parsing on unterminated script (Pierre Belzile),
885: 627987 Fix XSD IDC errors in imported schemas (Jim Panetta),
886: 629325 XPath rounding errors first cleanup (Phil Shafer),
887: 630140 fix iso995x encoding error (Daniel Veillard),
888: make sure htmlCtxtReset do reset the disableSAX field (Daniel Veillard),
889: Fix a change of semantic on XPath preceding and following axis (Daniel Veillard),
890: Fix a potential segfault due to weak symbols on pthreads (Mike Hommey),
891: Fix a leak in XPath compilation (Daniel Veillard),
892: Fix the semantic of XPath axis for namespace/attribute context nodes (Daniel Veillard),
893: Avoid a descriptor leak in catalog loading code (Carlo Bramini),
894: Fix a small bug in XPath evaluation code (Marius Wachtler),
895: Fix handling of XML-1.0 XML namespace declaration (Daniel Veillard),
896: Fix errors in XSD double validation check (Csaba Raduly),
897: Fix handling of apos in URIs (Daniel Veillard),
898: xmlTextReaderReadOuterXml should handle DTD (Rob Richards),
899: Autogen.sh needs to create m4 directory (Rob Richards)
900: </li>
901: <li> Improvements:
902: 606592 update language ID parser to RFC 5646 (Daniel Veillard),
903: Sort python generated stubs (Mike Hommey),
904: Add an HTML parser option to avoid a default doctype (Daniel Veillard)
905: </li>
906: <li> Cleanups:
907: 618831 don't ship generated files in git (Adrian Bunk),
908: Switch from the obsolete mkinstalldirs to AC_PROG_MKDIR_P (Adrian Bunk),
909: Various cleanups on encoding handling (Daniel Veillard),
910: Fix xmllint to use format=1 for default formatting (Adam Spragg),
911: Force _xmlSaveCtxt.format to be 0 or 1 (Adam Spragg),
912: Cleanup encoding pointer comparison (Nikolay Sivov),
913: Small code cleanup on previous patch (Daniel Veillard)
914: </li>
915: </ul>
916: <h3>2.7.7: Mar 15 2010</h3>
917: <ul>
918: <li> Improvements:
919: Adding a --xpath option to xmllint (Daniel Veillard),
920: Make HTML parser non-recursive (Eugene Pimenov)
921: </li>
922: <li> Portability:
923: relaxng.c: cast to allow compilation with sun studio 11 (Ben Walton),
924: Fix build failure on Sparc solaris (Roumen Petrov),
925: use autoreconf in autogen.sh (Daniel Veillard),
926: Fix build with mingw (Roumen Petrov),
927: Upgrade some of the configure and autogen (Daniel Veillard),
928: Fix relaxNG tests in runtest for Windows runtest.c: initialize ret (Rob Richards),
929: Fix a const warning in xmlNodeSetBase (Martin Trappel),
930: Fix python generator to not use deprecated xmllib (Daniel Veillard),
931: Update some automake files (Daniel Veillard),
932: 598785 Fix nanohttp on Windows (spadix)
933: </li>
934: <li> Bug Fixes:
935: libxml violates the zlib interface and crashes (Mark Adler),
936: Fix broken escape behaviour in regexp ranges (Daniel Veillard),
937: Fix missing win32 libraries in libxml-2.0.pc (Volker Grabsch),
938: Fix detection of python linker flags (Daniel Macks),
939: fix build error in libxml2/python (Paul Smith),
940: ChunkParser: Incorrect decoding of small xml files (Raul Hudea),
941: htmlCheckEncoding doesn't update input-end after shrink (Eugene Pimenov),
942: Fix a missing #ifdef (Daniel Veillard),
943: Fix encoding selection for xmlParseInNodeContext (Daniel Veillard),
944: xmlPreviousElementSibling mistake (François Delyon),
945: 608773 add a missing check in xmlGROW (Daniel Veillard),
946: Fix xmlParseInNodeContext for HTML content (Daniel Veillard),
947: Fix lost namespace when copying node * tree.c: reconcile namespace if not found (Rob Richards),
948: Fix some missing commas in HTML element lists (Eugene Pimenov),
949: Correct variable type to unsigned (Nikolay Sivov),
950: Recognize ID attribute in HTML without DOCTYPE (Daniel Veillard),
951: Fix memory leak in xmlXPathEvalExpression() (Martin),
952: Fix an init bug in global.c (Kai Henning),
953: Fix xmlNodeSetBase() comment (Daniel Veillard),
954: Fix broken escape behaviour in regexp ranges (Daniel Veillard),
955: Don't give default HTML boolean attribute values in parser (Daniel Veillard),
956: xmlCtxtResetLastError should reset ctxt-errNo (Daniel Veillard)
957: </li>
958: <li> Cleanups:
959: Cleanup a couple of weirdness in HTML parser (Eugene Pimenov)
960: </li>
961: </ul>
962: <h3>2.7.6: Oct 6 2009</h3>
963: <ul>
964: <li> Bug Fixes:
965: Restore thread support in default configuration (Andrew W. Nosenko),
966: URI with no path parsing problem (Daniel Veillard),
967: Minor patch for conditional defines in threads.c (Eric Zurcher)
968: </li>
969: </ul>
970: <h3>2.7.5: Sep 24 2009</h3>
971: <ul>
972: <li> Bug Fixes:
973: Restore behavior of --with-threads without argument (Andrew W. Nosenko),
974: Fix memory leak when doc is NULL (Rob Richards),
975: 595792 fixing a RelaxNG bug introduced in 2.7.4 (Daniel Veillard),
976: Fix a Relaxng bug raised by libvirt test suite (Daniel Veillard),
977: Fix a parsing problem with little data at startup (Daniel Veillard),
978: link python module with python library (Frederic Crozat),
979: 594874 Forgot an fclose in xmllint (Daniel Veillard)
980: </li>
981: <li> Cleanup:
982: Adding symbols.xml to EXTRA_DIST (Daniel Veillard)
983: </li>
984: </ul>
985: <h3>2.7.4: Sep 10 2009</h3>
986: <ul>
987: <li>Improvements:
988: Switch to GIT (GNOME),
989: Add symbol versioning to libxml2 shared libs (Daniel Veillard)
990: </li>
991: <li>Portability:
992: 593857 try to work around thread pbm MinGW 4.4 (Daniel Veillard),
993: 594250 rename ATTRIBUTE_ALLOC_SIZE to avoid clashes (Daniel Veillard),
994: Fix Windows build * relaxng.c: fix windows build (Rob Richards),
995: Fix the globals.h to use XMLPUBFUN (Paul Smith),
996: Problem with extern extern in header (Daniel Veillard),
997: Add -lnetwork for compiling on Haiku (Scott McCreary),
998: Runtest portability patch for Solaris (Tim Rice),
999: Small patch to accomodate the Haiku OS (Scott McCreary),
1000: 584605 package VxWorks folder in the distribution (Daniel Veillard),
1001: 574017 Realloc too expensive on most platform (Daniel Veillard),
1002: Fix windows build (Rob Richards),
1003: 545579 doesn't compile without schema support (Daniel Veillard),
1004: xmllint use xmlGetNodePath when not compiled in (Daniel Veillard),
1005: Try to avoid __imp__xmlFree link trouble on msys (Daniel Veillard),
1006: Allow to select the threading system on Windows (LRN),
1007: Fix Solaris binary links, cleanups (Daniel Veillard),
1008: Bug 571059 – MSVC doesn't work with the bakefile (Intron),
1009: fix ATTRIBUTE_PRINTF header clash (Belgabor and Mike Hommey),
1010: fixes for Borland/CodeGear/Embarcadero compilers (Eric Zurcher)
1011: </li>
1012: <li>Documentation:
1013: 544910 typo: "renciliateNs" (Leonid Evdokimov),
1014: Add VxWorks to list of OSes (Daniel Veillard),
1015: Regenerate the documentation and update for git (Daniel Veillard),
1016: 560524 ¿ xmlTextReaderLocalName description (Daniel Veillard),
1017: Added sponsoring by AOE media for the server (Daniel Veillard),
1018: updated URLs for GNOME (Vincent Lefevre),
1019: more warnings about xmlCleanupThreads and xmlCleanupParser (Daniel Veillard)
1020: </li>
1021: <li>Bug fixes:
1022: 594514 memory leaks - duplicate initialization (MOD),
1023: Wrong block opening in htmlNodeDumpOutputInternal (Daniel Veillard),
1024: 492317 Fix Relax-NG validation problems (Daniel Veillard),
1025: 558452 fight with reg test and error report (Daniel Veillard),
1026: 558452 RNG compilation of optional multiple child (Daniel Veillard),
1027: 579746 XSD validation not correct / nilable groups (Daniel Veillard),
1028: 502960 provide namespace stack when parsing entity (Daniel Veillard),
1029: 566012 part 2 fix regresion tests and push mode (Daniel Veillard),
1030: 566012 autodetected encoding and encoding conflict (Daniel Veillard),
1031: 584220 xpointer(/) and xinclude problems (Daniel Veillard),
1032: 587663 Incorrect Attribute-Value Normalization (Daniel Veillard),
1033: 444994 HTML chunked failure for attribute with <> (Daniel Veillard),
1034: Fix end of buffer char being split in XML parser (Daniel Veillard),
1035: Non ASCII character may be split at buffer end (Adiel Mittmann),
1036: 440226 Add xmlXIncludeProcessTreeFlagsData API (Stefan Behnel),
1037: 572129 speed up parsing of large HTML text nodes (Markus Kull),
1038: Fix HTML parsing with 0 character in CDATA (Daniel Veillard),
1039: Fix SetGenericErrorFunc and SetStructured clash (Wang Lam),
1040: 566012 Incomplete EBCDIC parsing support (Martin Kogler),
1041: 541335 HTML avoid creating 2 head or 2 body element (Daniel Veillard),
1042: 541237 error correcting missing end tags in HTML (Daniel Veillard),
1043: 583439 missing line numbers in push mode (Daniel Veillard),
1044: 587867 xmllint --html --xmlout serializing as HTML (Daniel Veillard),
1045: 559501 avoid select and use poll for nanohttp (Raphael Prevost),
1046: 559410 - Regexp bug on (...)? constructs (Daniel Veillard),
1047: Fix a small problem on previous HTML parser patch (Daniel Veillard),
1048: 592430 - HTML parser runs into endless loop (Daniel Veillard),
1049: 447899 potential double free in xmlFreeTextReader (Daniel Veillard),
1050: 446613 small validation bug mixed content with NS (Daniel Veillard),
1051: Fix the problem of revalidating a doc with RNG (Daniel Veillard),
1052: Fix xmlKeepBlanksDefault to not break indent (Nick Wellnhofer),
1053: 512131 refs from externalRef part need to be added (Daniel Veillard),
1054: 512131 crash in xmlRelaxNGValidateFullElement (Daniel Veillard),
1055: 588441 allow '.' in HTML Names even if invalid (Daniel Veillard),
1056: 582913 Fix htmlSetMetaEncoding() to be nicer (Daniel Veillard),
1057: 579317 Try to find the HTML encoding information (Daniel Veillard),
1058: 575875 don't output charset=html (Daniel Veillard),
1059: 571271 fix semantic of xsd:all with minOccurs=0 (Daniel Veillard),
1060: 570702 fix a bug in regexp determinism checking (Daniel Veillard),
1061: 567619 xmlValidateNotationUse missing param test (Daniel Veillard),
1062: 574393 ¿ utf-8 filename magic for compressed files (Hans Breuer),
1063: Fix a couple of problems in the parser (Daniel Veillard),
1064: 585505 ¿ Document ids and refs populated by XSD (Wayne Jensen),
1065: 582906 XSD validating multiple imports of the same schema (Jason Childs),
1066: Bug 582887 ¿ problems validating complex schemas (Jason Childs),
1067: Bug 579729 ¿ fix XSD schemas parsing crash (Miroslav Bajtos),
1068: 576368 ¿ htmlChunkParser with special attributes (Jiri Netolicky),
1069: Bug 565747 ¿ relax anyURI data character checking (Vincent Lefevre),
1070: Preserve attributes of include start on tree copy (Petr Pajas),
1071: Skip silently unrecognized XPointer schemes (Jakub Wilk),
1072: Fix leak on SAX1, xmllint --sax1 option and debug (Daniel Veillard),
1073: potential NULL dereference on non-glibc (Jim Meyering),
1074: Fix an XSD validation crash (Daniel Veillard),
1075: Fix a regression in streaming entities support (Daniel Veillard),
1076: Fix a couple of ABI issues with C14N 1.1 (Aleksey Sanin),
1077: Aleksey Sanin support for c14n 1.1 (Aleksey Sanin),
1078: reader bug fix with entities (Daniel Veillard),
1079: use options from current parser ctxt for external entities (Rob Richards),
1080: 581612 use %s to printf strings (Christian Persch),
1081: 584605 change the threading initialization sequence (Igor Novoseltsev),
1082: 580705 keep line numbers in HTML parser (Aaron Patterson),
1083: 581803 broken HTML table attributes init (Roland Steiner),
1084: do not set error code in xmlNsWarn (Rob Richards),
1085: 564217 fix structured error handling problems,
1086: reuse options from current parser for entities (Rob Richards),
1087: xmlXPathRegisterNs should not allow enpty prefixes (Daniel Veillard),
1088: add a missing check in xmlAddSibling (Kris Breuker),
1089: avoid leaks on errors (Jinmei Tatuya)
1090: </li>
1091: <li>Cleanup:
1092: Chasing dead assignments reported by clang-scan (Daniel Veillard),
1093: A few more safety cleanup raised by scan (Daniel Veillard),
1094: Fixing assorted potential problems raised by scan (Daniel Veillard),
1095: Potential uninitialized arguments raised by scan (Daniel Veillard),
1096: Fix a bunch of scan 'dead increments' and cleanup (Daniel Veillard),
1097: Remove a pedantic warning (Daniel Veillard),
1098: 555833 always use rm -f in uninstall-local (Daniel Veillard),
1099: 542394 xmlRegisterOutputCallbacks MAX_INPUT_CALLBACK (Daniel Veillard),
1100: Autoregenerate libxml2.syms automated checkings (Daniel Veillard),
1101: Make xmlRecoverDoc const (Martin Trappel) (Daniel Veillard),
1102: Both args of xmlStrcasestr are const (Daniel Veillard),
1103: hide the nbParse* variables used for debugging (Mike Hommey),
1104: 570806 changed include of config.h (William M. Brack),
1105: cleanups and error reports when xmlTextWriterVSprintf fails (Jinmei Tatuya)
1106: </li>
1107: </ul>
1108: <h3>2.7.3: Jan 18 2009</h3>
1109: <ul>
1110: <li>Build fix: fix build when HTML support is not included.</li>
1111: <li>Bug fixes: avoid memory overflow in gigantic text nodes,
1112: indentation problem on the writed (Rob Richards),
1113: xmlAddChildList pointer problem (Rob Richards and Kevin Milburn),
1114: xmlAddChild problem with attribute (Rob Richards and Kris Breuker),
1115: avoid a memory leak in an edge case (Daniel Zimmermann),
1116: deallocate some pthread data (Alex Ott).</li>
1117: <li>Improvements: configure option to avoid rebuilding docs (Adrian Bunk),
1118: limit text nodes to 10MB max by default, add element traversal
1119: APIs, add a parser option to enable pre 2.7 SAX behavior (Rob Richards),
1120: add gcc malloc checking (Marcus Meissner), add gcc printf like functions
1121: parameters checking (Marcus Meissner).</li>
1122: </ul>
1123: <h3>2.7.2: Oct 3 2008</h3>
1124: <ul>
1125: <li>Portability fix: fix solaris compilation problem, fix compilation
1126: if XPath is not configured in</li>
1127: <li>Bug fixes: nasty entity bug introduced in 2.7.0, restore old behaviour
1128: when saving an HTML doc with an xml dump function, HTML UTF-8 parsing
1129: bug, fix reader custom error handlers (Riccardo Scussat)
1130: <li>Improvement: xmlSave options for more flexibility to save as
1131: XML/HTML/XHTML, handle leading BOM in HTML documents</li>
1132: </ul>
1133:
1134: <h3>2.7.1: Sep 1 2008</h3>
1135: <ul>
1136: <li>Portability fix: Borland C fix (Moritz Both)</li>
1137: <li>Bug fixes: python serialization wrappers, XPath QName corner
1138: case handking and leaks (Martin)</li>
1139: <li>Improvement: extend the xmlSave to handle HTML documents and trees</li>
1140: <li>Cleanup: python serialization wrappers</li>
1141: </ul>
1142:
1143: <h3>2.7.0: Aug 30 2008</h3>
1144: <ul>
1145: <li>Documentation: switch ChangeLog to UTF-8, improve mutithreads and
1146: xmlParserCleanup docs</li>
1147: <li>Portability fixes: Older Win32 platforms (Rob Richards), MSVC
1148: porting fix (Rob Richards), Mac OS X regression tests (Sven Herzberg),
1149: non GNUCC builds (Rob Richards), compilation on Haiku (Andreas Färber)
1150: </li>
1151: <li>Bug fixes: various realloc problems (Ashwin), potential double-free
1152: (Ashwin), regexp crash, icrash with invalid whitespace facets (Rob
1153: Richards), pattern fix when streaming (William Brack), various XML
1154: parsing and validation fixes based on the W3C regression tests, reader
1155: tree skipping function fix (Ashwin), Schemas regexps escaping fix
1156: (Volker Grabsch), handling of entity push errors (Ashwin), fix a slowdown
1157: when encoder cant serialize characters on output</li>
1158: <li>Code cleanup: compilation fix without the reader, without the output
1159: (Robert Schwebel), python whitespace (Martin), many space/tabs cleanups,
1160: serious cleanup of the entity handling code</li>
1161: <li>Improvement: switch parser to XML-1.0 5th edition, add parsing flags
1162: for old versions, switch URI parsing to RFC 3986,
1163: add xmlSchemaValidCtxtGetParserCtxt (Holger Kaelberer),
1164: new hashing functions for dictionnaries (based on Stefan Behnel work),
1165: improve handling of misplaced html/head/body in HTML parser, better
1166: regression test tools and code coverage display, better algorithms
1167: to detect various versions of the billion laughts attacks, make
1168: arbitrary parser limits avoidable as a parser option</li>
1169: </ul>
1170: <h3>2.6.32: Apr 8 2008</h3>
1171: <ul>
1172: <li>Documentation: returning heap memory to kernel (Wolfram Sang),
1173: trying to clarify xmlCleanupParser() use, xmlXPathContext improvement
1174: (Jack Jansen), improve the *Recover* functions documentation,
1175: XmlNodeType doc link fix (Martijn Arts)</li>
1176: <li>Bug fixes: internal subset memory leak (Ashwin), avoid problem with
1177: paths starting with // (Petr Sumbera), streaming XSD validation callback
1178: patches (Ashwin), fix redirection on port other than 80 (William Brack),
1179: SAX2 leak (Ashwin), XInclude fragment of own document (Chris Ryan),
1180: regexp bug with '.' (Andrew Tosh), flush the writer at the end of the
1181: document (Alfred Mickautsch), output I/O bug fix (William Brack),
1182: writer CDATA output after a text node (Alex Khesin), UTF-16 encoding
1183: detection (William Brack), fix handling of empty CDATA nodes for Safari
1184: team, python binding problem with namespace nodes, improve HTML parsing
1185: (Arnold Hendriks), regexp automata build bug, memory leak fix (Vasily
1186: Chekalkin), XSD test crash, weird system parameter entity parsing problem,
1187: allow save to file:///X:/ windows paths, various attribute normalisation
1188: problems, externalSubsetSplit fix (Ashwin), attribute redefinition in
1189: the DTD (Ashwin), fix in char ref parsing check (Alex Khesin), many
1190: out of memory handling fixes (Ashwin), XPath out of memory handling fixes
1191: (Alvaro Herrera), various realloc problems (Ashwin), UCS4 encoding
1192: conversion buffer size (Christian Fruth), problems with EatName
1193: functions on memory errors, BOM handling in external parsed entities
1194: (Mark Rowe)</li>
1195: <li>Code cleanup: fix build under VS 2008 (David Wimsey), remove useless
1196: mutex in xmlDict (Florent Guilian), Mingw32 compilation fix (Carlo
1197: Bramini), Win and MacOS EOL cleanups (Florent Guiliani), iconv need
1198: a const detection (Roumen Petrov), simplify xmlSetProp (Julien Charbon),
1199: cross compilation fixes for Mingw (Roumen Petrov), SCO Openserver build
1200: fix (Florent Guiliani), iconv uses const on Win32 (Rob Richards),
1201: duplicate code removal (Ashwin), missing malloc test and error reports
1202: (Ashwin), VMS makefile fix (Tycho Hilhorst)</li>
1203: <li>improvements: better plug of schematron in the normal error handling
1204: (Tobias Minich)</li>
1205: </ul>
1206:
1207: <h3>2.6.31: Jan 11 2008</h3>
1208: <ul>
1209: <li>Security fix: missing of checks in UTF-8 parsing</li>
1210: <li>Bug fixes: regexp bug, dump attribute from XHTML document, fix
1211: xmlFree(NULL) to not crash in debug mode, Schematron parsing crash
1212: (Rob Richards), global lock free on Windows (Marc-Antoine Ruel),
1213: XSD crash due to double free (Rob Richards), indentation fix in
1214: xmlTextWriterFullEndElement (Felipe Pena), error in attribute type
1215: parsing if attribute redeclared, avoid crash in hash list scanner if
1216: deleting elements, column counter bug fix (Christian Schmidt),
1217: HTML embed element saving fix (Stefan Behnel), avoid -L/usr/lib
1218: output from xml2-config (Fred Crozat), avoid an xmllint crash
1219: (Stefan Kost), don't stop HTML parsing on out of range chars.
1220: </li>
1221: <li>Code cleanup: fix open() call third argument, regexp cut'n paste
1222: copy error, unused variable in __xmlGlobalInitMutexLock (Hannes Eder),
1223: some make distcheck realted fixes (John Carr)</li>
1224: <li>Improvements: HTTP Header: includes port number (William Brack),
1225: testURI --debug option, </li>
1226: </ul>
1227: <h3>2.6.30: Aug 23 2007</h3>
1228: <ul>
1229: <li>Portability: Solaris crash on error handling, windows path fixes
1230: (Roland Schwarz and Rob Richards), mingw build (Roland Schwarz)</li>
1231: <li>Bugfixes: xmlXPathNodeSetSort problem (William Brack), leak when
1232: reusing a writer for a new document (Dodji Seketeli), Schemas
1233: xsi:nil handling patch (Frank Gross), relative URI build problem
1234: (Patrik Fimml), crash in xmlDocFormatDump, invalid char in comment
1235: detection bug, fix disparity with xmlSAXUserParseMemory, automata
1236: generation for complex regexp counts problems, Schemas IDC import
1237: problems (Frank Gross), xpath predicate evailation error handling
1238: (William Brack)</li>
1239: </ul>
1240: <h3>2.6.29: Jun 12 2007</h3>
1241: <ul>
1242: <li>Portability: patches from Andreas Stricke for WinCEi,
1243: fix compilation warnings (William Brack), avoid warnings on Apple OS/X
1244: (Wendy Doyle and Mark Rowe), Windows compilation and threading
1245: improvements (Rob Richards), compilation against old Python versions,
1246: new GNU tar changes (Ryan Hill)</li>
1247: <li>Documentation: xmlURIUnescapeString comment, </li>
1248: <li>Bugfixes: xmlBufferAdd problem (Richard Jones), 'make valgrind'
1249: flag fix (Richard Jones), regexp interpretation of \,
1250: htmlCreateDocParserCtxt (Jean-Daniel Dupas), configure.in
1251: typo (Bjorn Reese), entity content failure, xmlListAppend() fix
1252: (Georges-André Silber), XPath number serialization (William Brack),
1253: nanohttp gzipped stream fix (William Brack and Alex Cornejo),
1254: xmlCharEncFirstLine typo (Mark Rowe), uri bug (François Delyon),
1255: XPath string value of PI nodes (William Brack), XPath node set
1256: sorting bugs (William Brack), avoid outputting namespace decl
1257: dups in the writer (Rob Richards), xmlCtxtReset bug, UTF-8 encoding
1258: error handling, recustion on next in catalogs, fix a Relax-NG crash,
1259: workaround wrong file: URIs, htmlNodeDumpFormatOutput on attributes,
1260: invalid character in attribute detection bug, big comments before
1261: internal subset streaming bug, HTML parsing of attributes with : in
1262: the name, IDness of name in HTML (Dagfinn I. Mannsåker) </li>
1263: <li>Improvement: keep URI query parts in raw form (Richard Jones),
1264: embed tag support in HTML (Michael Day) </li>
1265: </ul>
1266:
1267: <h3>2.6.28: Apr 17 2007</h3>
1268: <ul>
1269: <li>Documentation: comment fixes (Markus Keim), xpath comments fixes too
1270: (James Dennett)</li>
1271: <li>Bug fixes: XPath bug (William Brack), HTML parser autoclose stack usage
1272: (Usamah Malik), various regexp bug fixes (DV and William), path conversion
1273: on Windows (Igor Zlatkovic), htmlCtxtReset fix (Michael Day), XPath
1274: principal node of axis bug, HTML serialization of some codepoint
1275: (Steven Rainwater), user data propagation in XInclude (Michael Day),
1276: standalone and XML decl detection (Michael Day), Python id ouptut
1277: for some id, fix the big python string memory leak, URI parsing fixes
1278: (Stéphane Bidoul and William), long comments parsing bug (William),
1279: concurrent threads initialization (Ted Phelps), invalid char
1280: in text XInclude (William), XPath memory leak (William), tab in
1281: python problems (Andreas Hanke), XPath node comparison error
1282: (Oleg Paraschenko), cleanup patch for reader (Julien Reichel),
1283: XML Schemas attribute group (William), HTML parsing problem (William),
1284: fix char 0x2d in regexps (William), regexp quantifier range with
1285: min occurs of 0 (William), HTML script/style parsing (Mike Day)</li>
1286: <li>Improvement: make xmlTextReaderSetup() public</li>
1287: <li>Compilation and postability: fix a missing include problem (William),
1288: __ss_familly on AIX again (Björn Wiberg), compilation without zlib
1289: (Michael Day), catalog patch for Win32 (Christian Ehrlicher),
1290: Windows CE fixes (Andreas Stricke)</li>
1291: <li>Various CVS to SVN infrastructure changes</li>
1292: </ul>
1293: <h3>2.6.27: Oct 25 2006</h3>
1294: <ul>
1295: <li>Portability fixes: file names on windows (Roland Schwingel,
1296: Emelyanov Alexey), windows compile fixup (Rob Richards),
1297: AIX iconv() is apparently case sensitive</li>
1298: <li>improvements: Python XPath types mapping (Nic Ferrier), XPath optimization
1299: (Kasimier), add xmlXPathCompiledEvalToBoolean (Kasimier), Python node
1300: equality and comparison (Andreas Pakulat), xmlXPathCollectAndTest
1301: improvememt (Kasimier), expose if library was compiled with zlib
1302: support (Andrew Nosenko), cache for xmlSchemaIDCMatcher structs
1303: (Kasimier), xmlTextConcat should work with comments and PIs (Rob
1304: Richards), export htmlNewParserCtxt needed by Michael Day, refactoring
1305: of catalog entity loaders (Michael Day), add XPointer support to
1306: python bindings (Ross Reedstrom, Brian West and Stefan Anca),
1307: try to sort out most file path to URI conversions and xmlPathToUri,
1308: add --html --memory case to xmllint</li>
1309: <li>building fix: fix --with-minimum (Felipe Contreras), VMS fix,
1310: const'ification of HTML parser structures (Matthias Clasen),
1311: portability fix (Emelyanov Alexey), wget autodetection (Peter
1312: Breitenlohner), remove the build path recorded in the python
1313: shared module, separate library flags for shared and static builds
1314: (Mikhail Zabaluev), fix --with-minimum --with-sax1 builds, fix
1315: --with-minimum --with-schemas builds</li>
1316: <li>bug fix: xmlGetNodePath fix (Kasimier), xmlDOMWrapAdoptNode and
1317: attribute (Kasimier), crash when using the recover mode,
1318: xmlXPathEvalExpr problem (Kasimier), xmlXPathCompExprAdd bug (Kasimier),
1319: missing destry in xmlFreeRMutex (Andrew Nosenko), XML Schemas fixes
1320: (Kasimier), warning on entities processing, XHTML script and style
1321: serialization (Kasimier), python generator for long types, bug in
1322: xmlSchemaClearValidCtxt (Bertrand Fritsch), xmlSchemaXPathEvaluate
1323: allocation bug (Marton Illes), error message end of line (Rob Richards),
1324: fix attribute serialization in writer (Rob Richards), PHP4 DTD validation
1325: crasher, parser safety patch (Ben Darnell), _private context propagation
1326: when parsing entities (with Michael Day), fix entities behaviour when
1327: using SAX, URI to file path fix (Mikhail Zabaluev), disapearing validity
1328: context, arg error in SAX callback (Mike Hommey), fix mixed-content
1329: autodetect when using --noblanks, fix xmlIOParseDTD error handling,
1330: fix bug in xmlSplitQName on special Names, fix Relax-NG element content
1331: validation bug, fix xmlReconciliateNs bug, fix potential attribute
1332: XML parsing bug, fix line/column accounting in XML parser, chunking bug
1333: in the HTML parser on script, try to detect obviously buggy HTML
1334: meta encoding indications, bugs with encoding BOM and xmlSaveDoc,
1335: HTML entities in attributes parsing, HTML minimized attribute values,
1336: htmlReadDoc and htmlReadIO were broken, error handling bug in
1337: xmlXPathEvalExpression (Olaf Walkowiak), fix a problem in
1338: htmlCtxtUseOptions, xmlNewInputFromFile could leak (Marius Konitzer),
1339: bug on misformed SSD regexps (Christopher Boumenot)
1340: </li>
1341: <li>documentation: warning about XML_PARSE_COMPACT (Kasimier Buchcik),
1342: fix xmlXPathCastToString documentation, improve man pages for
1343: xmllitn and xmlcatalog (Daniel Leidert), fixed comments of a few
1344: functions</li>
1345: </ul>
1346: <h3>2.6.26: Jun 6 2006</h3>
1347: <ul>
1348: <li>portability fixes: Python detection (Joseph Sacco), compilation
1349: error(William Brack and Graham Bennett), LynxOS patch (Olli Savia)</li>
1350: <li>bug fixes: encoding buffer problem, mix of code and data in
1351: xmlIO.c(Kjartan Maraas), entities in XSD validation (Kasimier Buchcik),
1352: variousXSD validation fixes (Kasimier), memory leak in pattern (Rob
1353: Richards andKasimier), attribute with colon in name (Rob Richards), XPath
1354: leak inerror reporting (Aleksey Sanin), XInclude text include of
1355: selfdocument.</li>
1356: <li>improvements: Xpath optimizations (Kasimier), XPath object
1357: cache(Kasimier)</li>
1358: </ul>
1359:
1360: <h3>2.6.25: Jun 6 2006:</h3>
1361:
1362: <p>Do not use or package 2.6.25</p>
1363:
1364: <h3>2.6.24: Apr 28 2006</h3>
1365: <ul>
1366: <li>Portability fixes: configure on Windows, testapi compile on windows
1367: (Kasimier Buchcik, venkat naidu), Borland C++ 6 compile (Eric Zurcher),
1368: HP-UX compiler workaround (Rick Jones), xml2-config bugfix, gcc-4.1
1369: cleanups, Python detection scheme (Joseph Sacco), UTF-8 file paths on
1370: Windows (Roland Schwingel).
1371: </li>
1372: <li>Improvements: xmlDOMWrapReconcileNamespaces xmlDOMWrapCloneNode (Kasimier
1373: Buchcik), XML catalog debugging (Rick Jones), update to Unicode 4.01.</li>
1374: <li>Bug fixes: xmlParseChunk() problem in 2.6.23, xmlParseInNodeContext()
1375: on HTML docs, URI behaviour on Windows (Rob Richards), comment streaming
1376: bug, xmlParseComment (with William Brack), regexp bug fixes (DV &
1377: Youri Golovanov), xmlGetNodePath on text/CDATA (Kasimier),
1378: one Relax-NG interleave bug, xmllint --path and --valid,
1379: XSD bugfixes (Kasimier), remove debug
1380: left in Python bindings (Nic Ferrier), xmlCatalogAdd bug (Martin Cole),
1381: xmlSetProp fixes (Rob Richards), HTML IDness (Rob Richards), a large
1382: number of cleanups and small fixes based on Coverity reports, bug
1383: in character ranges, Unicode tables const (Aivars Kalvans), schemas
1384: fix (Stefan Kost), xmlRelaxNGParse error deallocation,
1385: xmlSchemaAddSchemaDoc error deallocation, error handling on unallowed
1386: code point, ixmllint --nonet to never reach the net (Gary Coady),
1387: line break in writer after end PI (Jason Viers). </li>
1388: <li>Documentation: man pages updates and cleanups (Daniel Leidert).</li>
1389: <li>New features: Relax NG structure error handlers.</li>
1390: </ul>
1391:
1392: <h3>2.6.23: Jan 5 2006</h3>
1393: <ul>
1394: <li>portability fixes: Windows (Rob Richards), getaddrinfo on Windows
1395: (Kolja Nowak, Rob Richards), icc warnings (Kjartan Maraas),
1396: --with-minimum compilation fixes (William Brack), error case handling fix
1397: on Solaris (Albert Chin), don't use 'list' as parameter name reported by
1398: Samuel Diaz Garcia, more old Unices portability fixes (Albert Chin),
1399: MinGW compilation (Mark Junker), HP-UX compiler warnings (Rick
1400: Jones),</li>
1401: <li>code cleanup: xmlReportError (Adrian Mouat), remove xmlBufferClose
1402: (Geert Jansen), unreachable code (Oleksandr Kononenko), refactoring
1403: parsing code (Bjorn Reese)</li>
1404: <li>bug fixes: xmlBuildRelativeURI and empty path (William Brack),
1405: combinatory explosion and performances in regexp code, leak in
1406: xmlTextReaderReadString(), xmlStringLenDecodeEntities problem (Massimo
1407: Morara), Identity Constraints bugs and a segfault (Kasimier Buchcik),
1408: XPath pattern based evaluation bugs (DV & Kasimier),
1409: xmlSchemaContentModelDump() memory leak (Kasimier), potential leak in
1410: xmlSchemaCheckCSelectorXPath(), xmlTextWriterVSprintf() misuse of
1411: vsnprintf (William Brack), XHTML serialization fix (Rob Richards), CRLF
1412: split problem (William), issues with non-namespaced attributes in
1413: xmlAddChild() xmlAddNextSibling() and xmlAddPrevSibling() (Rob Richards),
1414: HTML parsing of script, Python must not output to stdout (Nic Ferrier),
1415: exclusive C14N namespace visibility (Aleksey Sanin), XSD dataype
1416: totalDigits bug (Kasimier Buchcik), error handling when writing to an
1417: xmlBuffer (Rob Richards), runtest schemas error not reported (Hisashi
1418: Fujinaka), signed/unsigned problem in date/time code (Albert Chin), fix
1419: XSI driven XSD validation (Kasimier), parsing of xs:decimal (Kasimier),
1420: fix DTD writer output (Rob Richards), leak in xmlTextReaderReadInnerXml
1421: (Gary Coady), regexp bug affecting schemas (Kasimier), configuration of
1422: runtime debugging (Kasimier), xmlNodeBufGetContent bug on entity refs
1423: (Oleksandr Kononenko), xmlRegExecPushString2 bug (Sreeni Nair),
1424: compilation and build fixes (Michael Day), removed dependancies on
1425: xmlSchemaValidError (Kasimier), bug with <xml:foo/>, more XPath
1426: pattern based evaluation fixes (Kasimier)</li>
1427: <li>improvements: XSD Schemas redefinitions/restrictions (Kasimier
1428: Buchcik), node copy checks and fix for attribute (Rob Richards), counted
1429: transition bug in regexps, ctxt->standalone = -2 to indicate no
1430: standalone attribute was found, add xmlSchemaSetParserStructuredErrors()
1431: (Kasimier Buchcik), add xmlTextReaderSchemaValidateCtxt() to API
1432: (Kasimier), handle gzipped HTTP resources (Gary Coady), add
1433: htmlDocDumpMemoryFormat. (Rob Richards),</li>
1434: <li>documentation: typo (Michael Day), libxml man page (Albert Chin), save
1435: function to XML buffer (Geert Jansen), small doc fix (Aron Stansvik),</li>
1436: </ul>
1437:
1438: <h3>2.6.22: Sep 12 2005</h3>
1439: <ul>
1440: <li>build fixes: compile without schematron (Stéphane Bidoul)</li>
1441: <li>bug fixes: xmlDebugDumpNode on namespace node (Oleg Paraschenko)i,
1442: CDATA push parser bug, xmlElemDump problem with XHTML1 doc,
1443: XML_FEATURE_xxx clash with expat headers renamed XML_WITH_xxx, fix some
1444: output formatting for meta element (Rob Richards), script and style
1445: XHTML1 serialization (David Madore), Attribute derivation fixups in XSD
1446: (Kasimier Buchcik), better IDC error reports (Kasimier Buchcik)</li>
1447: <li>improvements: add XML_SAVE_NO_EMPTY xmlSaveOption (Rob Richards), add
1448: XML_SAVE_NO_XHTML xmlSaveOption, XML Schemas improvements preparing for
1449: derive (Kasimier Buchcik).</li>
1450: <li>documentation: generation of gtk-doc like docs, integration with
1451: devhelp.</li>
1452: </ul>
1453:
1454: <h3>2.6.21: Sep 4 2005</h3>
1455: <ul>
1456: <li>build fixes: Cygwin portability fixes (Gerrit P. Haase), calling
1457: convention problems on Windows (Marcus Boerger), cleanups based on Linus'
1458: sparse tool, update of win32/configure.js (Rob Richards), remove warnings
1459: on Windows(Marcus Boerger), compilation without SAX1, detection of the
1460: Python binary, use $GCC inestad of $CC = 'gcc' (Andrew W. Nosenko),
1461: compilation/link with threads and old gcc, compile problem by C370 on
1462: Z/OS,</li>
1463: <li>bug fixes: http_proxy environments (Peter Breitenlohner), HTML UTF-8
1464: bug (Jiri Netolicky), XPath NaN compare bug (William Brack),
1465: htmlParseScript potential bug, Schemas regexp handling of spaces, Base64
1466: Schemas comparisons NIST passes, automata build error xsd:all,
1467: xmlGetNodePath for namespaced attributes (Alexander Pohoyda), xmlSchemas
1468: foreign namespaces handling, XML Schemas facet comparison (Kupriyanov
1469: Anatolij), xmlSchemaPSimpleTypeErr error report (Kasimier Buchcik), xml:
1470: namespace ahndling in Schemas (Kasimier), empty model group in Schemas
1471: (Kasimier), wilcard in Schemas (Kasimier), URI composition (William),
1472: xs:anyType in Schemas (Kasimier), Python resolver emmitting error
1473: messages directly, Python xmlAttr.parent (Jakub Piotr Clapa), trying to
1474: fix the file path/URI conversion, xmlTextReaderGetAttribute fix (Rob
1475: Richards), xmlSchemaFreeAnnot memleak (Kasimier), HTML UTF-8
1476: serialization, streaming XPath, Schemas determinism detection problem,
1477: XInclude bug, Schemas context type (Dean Hill), validation fix (Derek
1478: Poon), xmlTextReaderGetAttribute[Ns] namespaces (Rob Richards), Schemas
1479: type fix (Kuba Nowakowski), UTF-8 parser bug, error in encoding handling,
1480: xmlGetLineNo fixes, bug on entities handling, entity name extraction in
1481: error handling with XInclude, text nodes in HTML body tags (Gary Coady),
1482: xml:id and IDness at the treee level fixes, XPath streaming patterns
1483: bugs.</li>
1484: <li>improvements: structured interfaces for schemas and RNG error reports
1485: (Marcus Boerger), optimization of the char data inner loop parsing
1486: (thanks to Behdad Esfahbod for the idea), schematron validation though
1487: not finished yet, xmlSaveOption to omit XML declaration, keyref match
1488: error reports (Kasimier), formal expression handling code not plugged
1489: yet, more lax mode for the HTML parser, parser XML_PARSE_COMPACT option
1490: for text nodes allocation.</li>
1491: <li>documentation: xmllint man page had --nonet duplicated</li>
1492: </ul>
1493:
1494: <h3>2.6.20: Jul 10 2005</h3>
1495: <ul>
1496: <li>build fixes: Windows build (Rob Richards), Mingw compilation (Igor
1497: Zlatkovic), Windows Makefile (Igor), gcc warnings (Kasimier and
1498: andriy@google.com), use gcc weak references to pthread to avoid the
1499: pthread dependancy on Linux, compilation problem (Steve Nairn), compiling
1500: of subset (Morten Welinder), IPv6/ss_family compilation (William Brack),
1501: compilation when disabling parts of the library, standalone test
1502: distribution.</li>
1503: <li>bug fixes: bug in lang(), memory cleanup on errors (William Brack),
1504: HTTP query strings (Aron Stansvik), memory leak in DTD (William), integer
1505: overflow in XPath (William), nanoftp buffer size, pattern "." apth fixup
1506: (Kasimier), leak in tree reported by Malcolm Rowe, replaceNode patch
1507: (Brent Hendricks), CDATA with NULL content (Mark Vakoc), xml:base fixup
1508: on XInclude (William), pattern fixes (William), attribute bug in
1509: exclusive c14n (Aleksey Sanin), xml:space and xml:lang with SAX2 (Rob
1510: Richards), namespace trouble in complex parsing (Malcolm Rowe), XSD type
1511: QNames fixes (Kasimier), XPath streaming fixups (William), RelaxNG bug
1512: (Rob Richards), Schemas for Schemas fixes (Kasimier), removal of ID (Rob
1513: Richards), a small RelaxNG leak, HTML parsing in push mode bug (James
1514: Bursa), failure to detect UTF-8 parsing bugs in CDATA sections,
1515: areBlanks() heuristic failure, duplicate attributes in DTD bug
1516: (William).</li>
1517: <li>improvements: lot of work on Schemas by Kasimier Buchcik both on
1518: conformance and streaming, Schemas validation messages (Kasimier Buchcik,
1519: Matthew Burgess), namespace removal at the python level (Brent
1520: Hendricks), Update to new Schemas regression tests from W3C/Nist
1521: (Kasimier), xmlSchemaValidateFile() (Kasimier), implementation of
1522: xmlTextReaderReadInnerXml and xmlTextReaderReadOuterXml (James Wert),
1523: standalone test framework and programs, new DOM import APIs
1524: xmlDOMWrapReconcileNamespaces() xmlDOMWrapAdoptNode() and
1525: xmlDOMWrapRemoveNode(), extension of xmllint capabilities for SAX and
1526: Schemas regression tests, xmlStopParser() available in pull mode too,
1527: ienhancement to xmllint --shell namespaces support, Windows port of the
1528: standalone testing tools (Kasimier and William),
1529: xmlSchemaValidateStream() xmlSchemaSAXPlug() and xmlSchemaSAXUnplug() SAX
1530: Schemas APIs, Schemas xmlReader support.</li>
1531: </ul>
1532:
1533: <h3>2.6.19: Apr 02 2005</h3>
1534: <ul>
1535: <li>build fixes: drop .la from RPMs, --with-minimum build fix (William
1536: Brack), use XML_SOCKLEN_T instead of SOCKLEN_T because it breaks with AIX
1537: 5.3 compiler, fixed elfgcchack.h generation and PLT reduction code on
1538: Linux/ELF/gcc4</li>
1539: <li>bug fixes: schemas type decimal fixups (William Brack), xmmlint return
1540: code (Gerry Murphy), small schemas fixes (Matthew Burgess and GUY
1541: Fabrice), workaround "DAV:" namespace brokeness in c14n (Aleksey Sanin),
1542: segfault in Schemas (Kasimier Buchcik), Schemas attribute validation
1543: (Kasimier), Prop related functions and xmlNewNodeEatName (Rob Richards),
1544: HTML serialization of name attribute on a elements, Python error handlers
1545: leaks and improvement (Brent Hendricks), uninitialized variable in
1546: encoding code, Relax-NG validation bug, potential crash if
1547: gnorableWhitespace is NULL, xmlSAXParseDoc and xmlParseDoc signatures,
1548: switched back to assuming UTF-8 in case no encoding is given at
1549: serialization time</li>
1550: <li>improvements: lot of work on Schemas by Kasimier Buchcik on facets
1551: checking and also mixed handling.</li>
1552: <li></li>
1553: </ul>
1554:
1555: <h3>2.6.18: Mar 13 2005</h3>
1556: <ul>
1557: <li>build fixes: warnings (Peter Breitenlohner), testapi.c generation,
1558: Bakefile support (Francesco Montorsi), Windows compilation (Joel Reed),
1559: some gcc4 fixes, HP-UX portability fixes (Rick Jones).</li>
1560: <li>bug fixes: xmlSchemaElementDump namespace (Kasimier Buchcik), push and
1561: xmlreader stopping on non-fatal errors, thread support for dictionnaries
1562: reference counting (Gary Coady), internal subset and push problem, URL
1563: saved in xmlCopyDoc, various schemas bug fixes (Kasimier), Python paths
1564: fixup (Stephane Bidoul), xmlGetNodePath and namespaces, xmlSetNsProp fix
1565: (Mike Hommey), warning should not count as error (William Brack),
1566: xmlCreatePushParser empty chunk, XInclude parser flags (William), cleanup
1567: FTP and HTTP code to reuse the uri parsing and IPv6 (William),
1568: xmlTextWriterStartAttributeNS fix (Rob Richards), XMLLINT_INDENT being
1569: empty (William), xmlWriter bugs (Rob Richards), multithreading on Windows
1570: (Rich Salz), xmlSearchNsByHref fix (Kasimier), Python binding leak (Brent
1571: Hendricks), aliasing bug exposed by gcc4 on s390, xmlTextReaderNext bug
1572: (Rob Richards), Schemas decimal type fixes (William Brack),
1573: xmlByteConsumed static buffer (Ben Maurer).</li>
1574: <li>improvement: speedup parsing comments and DTDs, dictionnary support for
1575: hash tables, Schemas Identity constraints (Kasimier), streaming XPath
1576: subset, xmlTextReaderReadString added (Bjorn Reese), Schemas canonical
1577: values handling (Kasimier), add xmlTextReaderByteConsumed (Aron
1578: Stansvik),</li>
1579: <li>Documentation: Wiki support (Joel Reed)</li>
1580: </ul>
1581:
1582: <h3>2.6.17: Jan 16 2005</h3>
1583: <ul>
1584: <li>build fixes: Windows, warnings removal (William Brack),
1585: maintainer-clean dependency(William), build in a different directory
1586: (William), fixing --with-minimum configure build (William), BeOS build
1587: (Marcin Konicki), Python-2.4 detection (William), compilation on AIX (Dan
1588: McNichol)</li>
1589: <li>bug fixes: xmlTextReaderHasAttributes (Rob Richards), xmlCtxtReadFile()
1590: to use the catalog(s), loop on output (William Brack), XPath memory leak,
1591: ID deallocation problem (Steve Shepard), debugDumpNode crash (William),
1592: warning not using error callback (William), xmlStopParser bug (William),
1593: UTF-16 with BOM on DTDs (William), namespace bug on empty elements in
1594: push mode (Rob Richards), line and col computations fixups (Aleksey
1595: Sanin), xmlURIEscape fix (William), xmlXPathErr on bad range (William),
1596: patterns with too many steps, bug in RNG choice optimization, line number
1597: sometimes missing.</li>
1598: <li>improvements: XSD Schemas (Kasimier Buchcik), python generator
1599: (William), xmlUTF8Strpos speedup (William), unicode Python strings
1600: (William), XSD error reports (Kasimier Buchcik), Python __str__ call
1601: serialize().</li>
1602: <li>new APIs: added xmlDictExists(), GetLineNumber and GetColumnNumber for
1603: the xmlReader (Aleksey Sanin), Dynamic Shared Libraries APIs (mostly Joel
1604: Reed), error extraction API from regexps, new XMLSave option for format
1605: (Phil Shafer)</li>
1606: <li>documentation: site improvement (John Fleck), FAQ entries
1607: (William).</li>
1608: </ul>
1609:
1610: <h3>2.6.16: Nov 10 2004</h3>
1611: <ul>
1612: <li>general hardening and bug fixing crossing all the API based on new
1613: automated regression testing</li>
1614: <li>build fix: IPv6 build and test on AIX (Dodji Seketeli)</li>
1615: <li>bug fixes: problem with XML::Libxml reported by Petr Pajas, encoding
1616: conversion functions return values, UTF-8 bug affecting XPath reported by
1617: Markus Bertheau, catalog problem with NULL entries (William Brack)</li>
1618: <li>documentation: fix to xmllint man page, some API function descritpion
1619: were updated.</li>
1620: <li>improvements: DTD validation APIs provided at the Python level (Brent
1621: Hendricks)</li>
1622: </ul>
1623:
1624: <h3>2.6.15: Oct 27 2004</h3>
1625: <ul>
1626: <li>security fixes on the nanoftp and nanohttp modules</li>
1627: <li>build fixes: xmllint detection bug in configure, building outside the
1628: source tree (Thomas Fitzsimmons)</li>
1629: <li>bug fixes: HTML parser on broken ASCII chars in names (William), Python
1630: paths (Malcolm Tredinnick), xmlHasNsProp and default namespace (William),
1631: saving to python file objects (Malcolm Tredinnick), DTD lookup fix
1632: (Malcolm), save back <group> in catalogs (William), tree build
1633: fixes (DV and Rob Richards), Schemas memory bug, structured error handler
1634: on Python 64bits, thread local memory deallocation, memory leak reported
1635: by Volker Roth, xmlValidateDtd in the presence of an internal subset,
1636: entities and _private problem (William), xmlBuildRelativeURI error
1637: (William).</li>
1638: <li>improvements: better XInclude error reports (William), tree debugging
1639: module and tests, convenience functions at the Reader API (Graham
1640: Bennett), add support for PI in the HTML parser.</li>
1641: </ul>
1642:
1643: <h3>2.6.14: Sep 29 2004</h3>
1644: <ul>
1645: <li>build fixes: configure paths for xmllint and xsltproc, compilation
1646: without HTML parser, compilation warning cleanups (William Brack &
1647: Malcolm Tredinnick), VMS makefile update (Craig Berry),</li>
1648: <li>bug fixes: xmlGetUTF8Char (William Brack), QName properties (Kasimier
1649: Buchcik), XInclude testing, Notation serialization, UTF8ToISO8859x
1650: transcoding (Mark Itzcovitz), lots of XML Schemas cleanup and fixes
1651: (Kasimier), ChangeLog cleanup (Stepan Kasal), memory fixes (Mark Vakoc),
1652: handling of failed realloc(), out of bound array adressing in Schemas
1653: date handling, Python space/tabs cleanups (Malcolm Tredinnick), NMTOKENS
1654: E20 validation fix (Malcolm),</li>
1655: <li>improvements: added W3C XML Schemas testsuite (Kasimier Buchcik), add
1656: xmlSchemaValidateOneElement (Kasimier), Python exception hierearchy
1657: (Malcolm Tredinnick), Python libxml2 driver improvement (Malcolm
1658: Tredinnick), Schemas support for xsi:schemaLocation,
1659: xsi:noNamespaceSchemaLocation, xsi:type (Kasimier Buchcik)</li>
1660: </ul>
1661:
1662: <h3>2.6.13: Aug 31 2004</h3>
1663: <ul>
1664: <li>build fixes: Windows and zlib (Igor Zlatkovic), -O flag with gcc,
1665: Solaris compiler warning, fixing RPM BuildRequires,</li>
1666: <li>fixes: DTD loading on Windows (Igor), Schemas error reports APIs
1667: (Kasimier Buchcik), Schemas validation crash, xmlCheckUTF8 (William Brack
1668: and Julius Mittenzwei), Schemas facet check (Kasimier), default namespace
1669: problem (William), Schemas hexbinary empty values, encoding error could
1670: genrate a serialization loop.</li>
1671: <li>Improvements: Schemas validity improvements (Kasimier), added --path
1672: and --load-trace options to xmllint</li>
1673: <li>documentation: tutorial update (John Fleck)</li>
1674: </ul>
1675:
1676: <h3>2.6.12: Aug 22 2004</h3>
1677: <ul>
1678: <li>build fixes: fix --with-minimum, elfgcchack.h fixes (Peter
1679: Breitenlohner), perl path lookup (William), diff on Solaris (Albert
1680: Chin), some 64bits cleanups.</li>
1681: <li>Python: avoid a warning with 2.3 (William Brack), tab and space mixes
1682: (William), wrapper generator fixes (William), Cygwin support (Gerrit P.
1683: Haase), node wrapper fix (Marc-Antoine Parent), XML Schemas support
1684: (Torkel Lyng)</li>
1685: <li>Schemas: a lot of bug fixes and improvements from Kasimier Buchcik</li>
1686: <li>fixes: RVT fixes (William), XPath context resets bug (William), memory
1687: debug (Steve Hay), catalog white space handling (Peter Breitenlohner),
1688: xmlReader state after attribute reading (William), structured error
1689: handler (William), XInclude generated xml:base fixup (William), Windows
1690: memory reallocation problem (Steve Hay), Out of Memory conditions
1691: handling (William and Olivier Andrieu), htmlNewDoc() charset bug,
1692: htmlReadMemory init (William), a posteriori validation DTD base
1693: (William), notations serialization missing, xmlGetNodePath (Dodji),
1694: xmlCheckUTF8 (Diego Tartara), missing line numbers on entity
1695: (William)</li>
1696: <li>improvements: DocBook catalog build scrip (William), xmlcatalog tool
1697: (Albert Chin), xmllint --c14n option, no_proxy environment (Mike Hommey),
1698: xmlParseInNodeContext() addition, extend xmllint --shell, allow XInclude
1699: to not generate start/end nodes, extend xmllint --version to include CVS
1700: tag (William)</li>
1701: <li>documentation: web pages fixes, validity API docs fixes (William)
1702: schemas API fix (Eric Haszlakiewicz), xmllint man page (John Fleck)</li>
1703: </ul>
1704:
1705: <h3>2.6.11: July 5 2004</h3>
1706: <ul>
1707: <li>Schemas: a lot of changes and improvements by Kasimier Buchcik for
1708: attributes, namespaces and simple types.</li>
1709: <li>build fixes: --with-minimum (William Brack), some gcc cleanup
1710: (William), --with-thread-alloc (William)</li>
1711: <li>portability: Windows binary package change (Igor Zlatkovic), Catalog
1712: path on Windows</li>
1713: <li>documentation: update to the tutorial (John Fleck), xmllint return code
1714: (John Fleck), man pages (Ville Skytta),</li>
1715: <li>bug fixes: C14N bug serializing namespaces (Aleksey Sanin), testSAX
1716: properly initialize the library (William), empty node set in XPath
1717: (William), xmlSchemas errors (William), invalid charref problem pointed
1718: by Morus Walter, XInclude xml:base generation (William), Relax-NG bug
1719: with div processing (William), XPointer and xml:base problem(William),
1720: Reader and entities, xmllint return code for schemas (William), reader
1721: streaming problem (Steve Ball), DTD serialization problem (William),
1722: libxml.m4 fixes (Mike Hommey), do not provide destructors as methods on
1723: Python classes, xmlReader buffer bug, Python bindings memory interfaces
1724: improvement (with Stéphane Bidoul), Fixed the push parser to be back to
1725: synchronous behaviour.</li>
1726: <li>improvement: custom per-thread I/O enhancement (Rob Richards), register
1727: namespace in debug shell (Stefano Debenedetti), Python based regression
1728: test for non-Unix users (William), dynamically increase the number of
1729: XPath extension functions in Python and fix a memory leak (Marc-Antoine
1730: Parent and William)</li>
1731: <li>performance: hack done with Arjan van de Ven to reduce ELF footprint
1732: and generated code on Linux, plus use gcc runtime profiling to optimize
1733: the code generated in the RPM packages.</li>
1734: </ul>
1735:
1736: <h3>2.6.10: May 17 2004</h3>
1737: <ul>
1738: <li>Web page generated for ChangeLog</li>
1739: <li>build fixes: --without-html problems, make check without make all</li>
1740: <li>portability: problem with xpath.c on Windows (MSC and Borland), memcmp
1741: vs. strncmp on Solaris, XPath tests on Windows (Mark Vakoc), C++ do not
1742: use "list" as parameter name, make tests work with Python 1.5 (Ed
1743: Davis),</li>
1744: <li>improvements: made xmlTextReaderMode public, small buffers resizing
1745: (Morten Welinder), add --maxmem option to xmllint, add
1746: xmlPopInputCallback() for Matt Sergeant, refactoring of serialization
1747: escaping, added escaping customization</li>
1748: <li>bugfixes: xsd:extension (Taihei Goi), assorted regexp bugs (William
1749: Brack), xmlReader end of stream problem, node deregistration with reader,
1750: URI escaping and filemanes, XHTML1 formatting (Nick Wellnhofer), regexp
1751: transition reduction (William), various XSD Schemas fixes (Kasimier
1752: Buchcik), XInclude fallback problem (William), weird problems with DTD
1753: (William), structured error handler callback context (William), reverse
1754: xmlEncodeSpecialChars() behaviour back to escaping '"'</li>
1755: </ul>
1756:
1757: <h3>2.6.9: Apr 18 2004</h3>
1758: <ul>
1759: <li>implement xml:id Working Draft, relaxed XPath id() checking</li>
1760: <li>bugfixes: xmlCtxtReset (Brent Hendricks), line number and CDATA (Dave
1761: Beckett), Relax-NG compilation (William Brack), Regexp patches (with
1762: William), xmlUriEscape (Mark Vakoc), a Relax-NG notAllowed problem (with
1763: William), Relax-NG name classes compares (William), XInclude duplicate
1764: fallback (William), external DTD encoding detection (William), a DTD
1765: validation bug (William), xmlReader Close() fix, recusive extention
1766: schemas</li>
1767: <li>improvements: use xmlRead* APIs in test tools (Mark Vakoc), indenting
1768: save optimization, better handle IIS broken HTTP redirect behaviour (Ian
1769: Hummel), HTML parser frameset (James Bursa), libxml2-python RPM
1770: dependancy, XML Schemas union support (Kasimier Buchcik), warning removal
1771: clanup (William), keep ChangeLog compressed when installing from RPMs</li>
1772: <li>documentation: examples and xmlDocDumpMemory docs (John Fleck), new
1773: example (load, xpath, modify, save), xmlCatalogDump() comments,</li>
1774: <li>Windows: Borland C++ builder (Eric Zurcher), work around Microsoft
1775: compiler NaN handling bug (Mark Vakoc)</li>
1776: </ul>
1777:
1778: <h3>2.6.8: Mar 23 2004</h3>
1779: <ul>
1780: <li>First step of the cleanup of the serialization code and APIs</li>
1781: <li>XML Schemas: mixed content (Adam Dickmeiss), QName handling fixes (Adam
1782: Dickmeiss), anyURI for "" (John Belmonte)</li>
1783: <li>Python: Canonicalization C14N support added (Anthony Carrico)</li>
1784: <li>xmlDocCopyNode() extension (William)</li>
1785: <li>Relax-NG: fix when processing XInclude results (William), external
1786: reference in interleave (William), missing error on <choice>
1787: failure (William), memory leak in schemas datatype facets.</li>
1788: <li>xmlWriter: patch for better DTD support (Alfred Mickautsch)</li>
1789: <li>bug fixes: xmlXPathLangFunction memory leak (Mike Hommey and William
1790: Brack), no ID errors if using HTML_PARSE_NOERROR, xmlcatalog fallbacks to
1791: URI on SYSTEM lookup failure, XInclude parse flags inheritance (William),
1792: XInclude and XPointer fixes for entities (William), XML parser bug
1793: reported by Holger Rauch, nanohttp fd leak (William), regexps char
1794: groups '-' handling (William), dictionnary reference counting problems,
1795: do not close stderr.</li>
1796: <li>performance patches from Petr Pajas</li>
1797: <li>Documentation fixes: XML_CATALOG_FILES in man pages (Mike Hommey)</li>
1798: <li>compilation and portability fixes: --without-valid, catalog cleanups
1799: (Peter Breitenlohner), MingW patch (Roland Schwingel), cross-compilation
1800: to Windows (Christophe de Vienne), --with-html-dir fixup (Julio Merino
1801: Vidal), Windows build (Eric Zurcher)</li>
1802: </ul>
1803:
1804: <h3>2.6.7: Feb 23 2004</h3>
1805: <ul>
1806: <li>documentation: tutorial updates (John Fleck), benchmark results</li>
1807: <li>xmlWriter: updates and fixes (Alfred Mickautsch, Lucas Brasilino)</li>
1808: <li>XPath optimization (Petr Pajas)</li>
1809: <li>DTD ID handling optimization</li>
1810: <li>bugfixes: xpath number with > 19 fractional (William Brack), push
1811: mode with unescaped '>' characters, fix xmllint --stream --timing, fix
1812: xmllint --memory --stream memory usage, xmlAttrSerializeTxtContent
1813: handling NULL, trying to fix Relax-NG/Perl interface.</li>
1814: <li>python: 2.3 compatibility, whitespace fixes (Malcolm Tredinnick)</li>
1815: <li>Added relaxng option to xmllint --shell</li>
1816: </ul>
1817:
1818: <h3>2.6.6: Feb 12 2004</h3>
1819: <ul>
1820: <li>nanohttp and nanoftp: buffer overflow error on URI parsing (Igor and
1821: William) reported by Yuuichi Teranishi</li>
1822: <li>bugfixes: make test and path issues, xmlWriter attribute serialization
1823: (William Brack), xmlWriter indentation (William), schemas validation
1824: (Eric Haszlakiewicz), XInclude dictionnaries issues (William and Oleg
1825: Paraschenko), XInclude empty fallback (William), HTML warnings (William),
1826: XPointer in XInclude (William), Python namespace serialization,
1827: isolat1ToUTF8 bound error (Alfred Mickautsch), output of parameter
1828: entities in internal subset (William), internal subset bug in push mode,
1829: <xs:all> fix (Alexey Sarytchev)</li>
1830: <li>Build: fix for automake-1.8 (Alexander Winston), warnings removal
1831: (Philip Ludlam), SOCKLEN_T detection fixes (Daniel Richard), fix
1832: --with-minimum configuration.</li>
1833: <li>XInclude: allow the 2001 namespace without warning.</li>
1834: <li>Documentation: missing example/index.html (John Fleck), version
1835: dependancies (John Fleck)</li>
1836: <li>reader API: structured error reporting (Steve Ball)</li>
1837: <li>Windows compilation: mingw, msys (Mikhail Grushinskiy), function
1838: prototype (Cameron Johnson), MSVC6 compiler warnings, _WINSOCKAPI_
1839: patch</li>
1840: <li>Parsers: added xmlByteConsumed(ctxt) API to get the byte offest in
1841: input.</li>
1842: </ul>
1843:
1844: <h3>2.6.5: Jan 25 2004</h3>
1845: <ul>
1846: <li>Bugfixes: dictionnaries for schemas (William Brack), regexp segfault
1847: (William), xs:all problem (William), a number of XPointer bugfixes
1848: (William), xmllint error go to stderr, DTD validation problem with
1849: namespace, memory leak (William), SAX1 cleanup and minimal options fixes
1850: (Mark Vadoc), parser context reset on error (Shaun McCance), XPath union
1851: evaluation problem (William) , xmlReallocLoc with NULL (Aleksey Sanin),
1852: XML Schemas double free (Steve Ball), XInclude with no href, argument
1853: callbacks order for XPath callbacks (Frederic Peters)</li>
1854: <li>Documentation: python scripts (William Brack), xslt stylesheets (John
1855: Fleck), doc (Sven Zimmerman), I/O example.</li>
1856: <li>Python bindings: fixes (William), enum support (Stéphane Bidoul),
1857: structured error reporting (Stéphane Bidoul)</li>
1858: <li>XInclude: various fixes for conformance, problem related to dictionnary
1859: references (William & me), recursion (William)</li>
1860: <li>xmlWriter: indentation (Lucas Brasilino), memory leaks (Alfred
1861: Mickautsch),</li>
1862: <li>xmlSchemas: normalizedString datatype (John Belmonte)</li>
1863: <li>code cleanup for strings functions (William)</li>
1864: <li>Windows: compiler patches (Mark Vakoc)</li>
1865: <li>Parser optimizations, a few new XPath and dictionnary APIs for future
1866: XSLT optimizations.</li>
1867: </ul>
1868:
1869: <h3>2.6.4: Dec 24 2003</h3>
1870: <ul>
1871: <li>Windows build fixes (Igor Zlatkovic)</li>
1872: <li>Some serious XInclude problems reported by Oleg Paraschenko and</li>
1873: <li>Unix and Makefile packaging fixes (me, William Brack,</li>
1874: <li>Documentation improvements (John Fleck, William Brack), example fix
1875: (Lucas Brasilino)</li>
1876: <li>bugfixes: xmlTextReaderExpand() with xmlReaderWalker, XPath handling of
1877: NULL strings (William Brack) , API building reader or parser from
1878: filedescriptor should not close it, changed XPath sorting to be stable
1879: again (William Brack), xmlGetNodePath() generating '(null)' (William
1880: Brack), DTD validation and namespace bug (William Brack), XML Schemas
1881: double inclusion behaviour</li>
1882: </ul>
1883:
1884: <h3>2.6.3: Dec 10 2003</h3>
1885: <ul>
1886: <li>documentation updates and cleanup (DV, William Brack, John Fleck)</li>
1887: <li>added a repository of examples, examples from Aleksey Sanin, Dodji
1888: Seketeli, Alfred Mickautsch</li>
1889: <li>Windows updates: Mark Vakoc, Igor Zlatkovic, Eric Zurcher, Mingw
1890: (Kenneth Haley)</li>
1891: <li>Unicode range checking (William Brack)</li>
1892: <li>code cleanup (William Brack)</li>
1893: <li>Python bindings: doc (John Fleck), bug fixes</li>
1894: <li>UTF-16 cleanup and BOM issues (William Brack)</li>
1895: <li>bug fixes: ID and xmlReader validation, XPath (William Brack),
1896: xmlWriter (Alfred Mickautsch), hash.h inclusion problem, HTML parser
1897: (James Bursa), attribute defaulting and validation, some serialization
1898: cleanups, XML_GET_LINE macro, memory debug when using threads (William
1899: Brack), serialization of attributes and entities content, xmlWriter
1900: (Daniel Schulman)</li>
1901: <li>XInclude bugfix, new APIs and update to the last version including the
1902: namespace change.</li>
1903: <li>XML Schemas improvements: include (Robert Stepanek), import and
1904: namespace handling, fixed the regression tests troubles, added examples
1905: based on Eric van der Vlist book, regexp fixes</li>
1906: <li>preliminary pattern support for streaming (needed for schemas
1907: constraints), added xmlTextReaderPreservePattern() to collect subdocument
1908: when streaming.</li>
1909: <li>various fixes in the structured error handling</li>
1910: </ul>
1911:
1912: <h3>2.6.2: Nov 4 2003</h3>
1913: <ul>
1914: <li>XPath context unregistration fixes</li>
1915: <li>text node coalescing fixes (Mark Lilback)</li>
1916: <li>API to screate a W3C Schemas from an existing document (Steve Ball)</li>
1917: <li>BeOS patches (Marcin 'Shard' Konicki)</li>
1918: <li>xmlStrVPrintf function added (Aleksey Sanin)</li>
1919: <li>compilation fixes (Mark Vakoc)</li>
1920: <li>stdin parsing fix (William Brack)</li>
1921: <li>a posteriori DTD validation fixes</li>
1922: <li>xmlReader bug fixes: Walker fixes, python bindings</li>
1923: <li>fixed xmlStopParser() to really stop the parser and errors</li>
1924: <li>always generate line numbers when using the new xmlReadxxx
1925: functions</li>
1926: <li>added XInclude support to the xmlReader interface</li>
1927: <li>implemented XML_PARSE_NONET parser option</li>
1928: <li>DocBook XSLT processing bug fixed</li>
1929: <li>HTML serialization for <p> elements (William Brack and me)</li>
1930: <li>XPointer failure in XInclude are now handled as resource errors</li>
1931: <li>fixed xmllint --html to use the HTML serializer on output (added
1932: --xmlout to implement the previous behaviour of saving it using the XML
1933: serializer)</li>
1934: </ul>
1935:
1936: <h3>2.6.1: Oct 28 2003</h3>
1937: <ul>
1938: <li>Mostly bugfixes after the big 2.6.0 changes</li>
1939: <li>Unix compilation patches: libxml.m4 (Patrick Welche), warnings cleanup
1940: (William Brack)</li>
1941: <li>Windows compilation patches (Joachim Bauch, Stephane Bidoul, Igor
1942: Zlatkovic)</li>
1943: <li>xmlWriter bugfix (Alfred Mickautsch)</li>
1944: <li>chvalid.[ch]: couple of fixes from Stephane Bidoul</li>
1945: <li>context reset: error state reset, push parser reset (Graham
1946: Bennett)</li>
1947: <li>context reuse: generate errors if file is not readable</li>
1948: <li>defaulted attributes for element coming from internal entities
1949: (Stephane Bidoul)</li>
1950: <li>Python: tab and spaces mix (William Brack)</li>
1951: <li>Error handler could crash in DTD validation in 2.6.0</li>
1952: <li>xmlReader: do not use the document or element _private field</li>
1953: <li>testSAX.c: avoid a problem with some PIs (Massimo Morara)</li>
1954: <li>general bug fixes: mandatory encoding in text decl, serializing
1955: Document Fragment nodes, xmlSearchNs 2.6.0 problem (Kasimier Buchcik),
1956: XPath errors not reported, slow HTML parsing of large documents.</li>
1957: </ul>
1958:
1959: <h3>2.6.0: Oct 20 2003</h3>
1960: <ul>
1961: <li>Major revision release: should be API and ABI compatible but got a lot
1962: of change</li>
1963: <li>Increased the library modularity, far more options can be stripped out,
1964: a --with-minimum configuration will weight around 160KBytes</li>
1965: <li>Use per parser and per document dictionnary, allocate names and small
1966: text nodes from the dictionnary</li>
1967: <li>Switch to a SAX2 like parser rewrote most of the XML parser core,
1968: provides namespace resolution and defaulted attributes, minimize memory
1969: allocations and copies, namespace checking and specific error handling,
1970: immutable buffers, make predefined entities static structures, etc...</li>
1971: <li>rewrote all the error handling in the library, all errors can be
1972: intercepted at a structured level, with precise information
1973: available.</li>
1974: <li>New simpler and more generic XML and HTML parser APIs, allowing to
1975: easilly modify the parsing options and reuse parser context for multiple
1976: consecutive documents.</li>
1977: <li>Similar new APIs for the xmlReader, for options and reuse, provided new
1978: functions to access content as const strings, use them for Python
1979: bindings</li>
1980: <li>a lot of other smaller API improvements: xmlStrPrintf (Aleksey Sanin),
1981: Walker i.e. reader on a document tree based on Alfred Mickautsch code,
1982: make room in nodes for line numbers, reference counting and future PSVI
1983: extensions, generation of character ranges to be checked with faster
1984: algorithm (William), xmlParserMaxDepth (Crutcher Dunnavant), buffer
1985: access</li>
1986: <li>New xmlWriter API provided by Alfred Mickautsch</li>
1987: <li>Schemas: base64 support by Anthony Carrico</li>
1988: <li>Parser<->HTTP integration fix, proper processing of the Mime-Type
1989: and charset information if available.</li>
1990: <li>Relax-NG: bug fixes including the one reported by Martijn Faassen and
1991: zeroOrMore, better error reporting.</li>
1992: <li>Python bindings (Stéphane Bidoul), never use stdout for errors
1993: output</li>
1994: <li>Portability: all the headers have macros for export and calling
1995: convention definitions (Igor Zlatkovic), VMS update (Craig A. Berry),
1996: Windows: threads (Jesse Pelton), Borland compiler (Eric Zurcher, Igor),
1997: Mingw (Igor), typos (Mark Vakoc), beta version (Stephane Bidoul),
1998: warning cleanups on AIX and MIPS compilers (William Brack), BeOS (Marcin
1999: 'Shard' Konicki)</li>
2000: <li>Documentation fixes and README (William Brack), search fix (William),
2001: tutorial updates (John Fleck), namespace docs (Stefan Kost)</li>
2002: <li>Bug fixes: xmlCleanupParser (Dave Beckett), threading uninitialized
2003: mutexes, HTML doctype lowercase, SAX/IO (William), compression detection
2004: and restore (William), attribute declaration in DTDs (William), namespace
2005: on attribute in HTML output (William), input filename (Rob Richards),
2006: namespace DTD validation, xmlReplaceNode (Chris Ryland), I/O callbacks
2007: (Markus Keim), CDATA serialization (Shaun McCance), xmlReader (Peter
2008: Derr), high codepoint charref like &#x10FFFF;, buffer access in push
2009: mode (Justin Fletcher), TLS threads on Windows (Jesse Pelton), XPath bug
2010: (William), xmlCleanupParser (Marc Liyanage), CDATA output (William), HTTP
2011: error handling.</li>
2012: <li>xmllint options: --dtdvalidfpi for Tobias Reif, --sax1 for compat
2013: testing, --nodict for building without tree dictionnary, --nocdata to
2014: replace CDATA by text, --nsclean to remove surperfluous namespace
2015: declarations</li>
2016: <li>added xml2-config --libtool-libs option from Kevin P. Fleming</li>
2017: <li>a lot of profiling and tuning of the code, speedup patch for
2018: xmlSearchNs() by Luca Padovani. The xmlReader should do far less
2019: allocation and it speed should get closer to SAX. Chris Anderson worked
2020: on speeding and cleaning up repetitive checking code.</li>
2021: <li>cleanup of "make tests"</li>
2022: <li>libxml-2.0-uninstalled.pc from Malcolm Tredinnick</li>
2023: <li>deactivated the broken docBook SGML parser code and plugged the XML
2024: parser instead.</li>
2025: </ul>
2026:
2027: <h3>2.5.11: Sep 9 2003</h3>
2028:
2029: <p>A bugfix only release:</p>
2030: <ul>
2031: <li>risk of crash in Relax-NG</li>
2032: <li>risk of crash when using multithreaded programs</li>
2033: </ul>
2034:
2035: <h3>2.5.10: Aug 15 2003</h3>
2036:
2037: <p>A bugfixes only release</p>
2038: <ul>
2039: <li>Windows Makefiles (William Brack)</li>
2040: <li>UTF-16 support fixes (Mark Itzcovitz)</li>
2041: <li>Makefile and portability (William Brack) automake, Linux alpha, Mingw
2042: on Windows (Mikhail Grushinskiy)</li>
2043: <li>HTML parser (Oliver Stoeneberg)</li>
2044: <li>XInclude performance problem reported by Kevin Ruscoe</li>
2045: <li>XML parser performance problem reported by Grant Goodale</li>
2046: <li>xmlSAXParseDTD() bug fix from Malcolm Tredinnick</li>
2047: <li>and a couple other cleanup</li>
2048: </ul>
2049:
2050: <h3>2.5.9: Aug 9 2003</h3>
2051: <ul>
2052: <li>bugfixes: IPv6 portability, xmlHasNsProp (Markus Keim), Windows build
2053: (Wiliam Brake, Jesse Pelton, Igor), Schemas (Peter Sobisch), threading
2054: (Rob Richards), hexBinary type (), UTF-16 BOM (Dodji Seketeli),
2055: xmlReader, Relax-NG schemas compilation, namespace handling, EXSLT (Sean
2056: Griffin), HTML parsing problem (William Brack), DTD validation for mixed
2057: content + namespaces, HTML serialization, library initialization,
2058: progressive HTML parser</li>
2059: <li>better interfaces for Relax-NG error handling (Joachim Bauch, )</li>
2060: <li>adding xmlXIncludeProcessTree() for XInclud'ing in a subtree</li>
2061: <li>doc fixes and improvements (John Fleck)</li>
2062: <li>configure flag for -with-fexceptions when embedding in C++</li>
2063: <li>couple of new UTF-8 helper functions (William Brack)</li>
2064: <li>general encoding cleanup + ISO-8859-x without iconv (Peter Jacobi)</li>
2065: <li>xmlTextReader cleanup + enum for node types (Bjorn Reese)</li>
2066: <li>general compilation/warning cleanup Solaris/HP-UX/... (William
2067: Brack)</li>
2068: </ul>
2069:
2070: <h3>2.5.8: Jul 6 2003</h3>
2071: <ul>
2072: <li>bugfixes: XPath, XInclude, file/URI mapping, UTF-16 save (Mark
2073: Itzcovitz), UTF-8 checking, URI saving, error printing (William Brack),
2074: PI related memleak, compilation without schemas or without xpath (Joerg
2075: Schmitz-Linneweber/Garry Pennington), xmlUnlinkNode problem with DTDs,
2076: rpm problem on , i86_64, removed a few compilation problems from 2.5.7,
2077: xmlIOParseDTD, and xmlSAXParseDTD (Malcolm Tredinnick)</li>
2078: <li>portability: DJGPP (MsDos) , OpenVMS (Craig A. Berry)</li>
2079: <li>William Brack fixed multithreading lock problems</li>
2080: <li>IPv6 patch for FTP and HTTP accesses (Archana Shah/Wipro)</li>
2081: <li>Windows fixes (Igor Zlatkovic, Eric Zurcher), threading (Stéphane
2082: Bidoul)</li>
2083: <li>A few W3C Schemas Structure improvements</li>
2084: <li>W3C Schemas Datatype improvements (Charlie Bozeman)</li>
2085: <li>Python bindings for thread globals (Stéphane Bidoul), and method/class
2086: generator</li>
2087: <li>added --nonet option to xmllint</li>
2088: <li>documentation improvements (John Fleck)</li>
2089: </ul>
2090:
2091: <h3>2.5.7: Apr 25 2003</h3>
2092: <ul>
2093: <li>Relax-NG: Compiling to regexp and streaming validation on top of the
2094: xmlReader interface, added to xmllint --stream</li>
2095: <li>xmlReader: Expand(), Next() and DOM access glue, bug fixes</li>
2096: <li>Support for large files: RGN validated a 4.5GB instance</li>
2097: <li>Thread support is now configured in by default</li>
2098: <li>Fixes: update of the Trio code (Bjorn), WXS Date and Duration fixes
2099: (Charles Bozeman), DTD and namespaces (Brent Hendricks), HTML push parser
2100: and zero bytes handling, some missing Windows file path conversions,
2101: behaviour of the parser and validator in the presence of "out of memory"
2102: error conditions</li>
2103: <li>extended the API to be able to plug a garbage collecting memory
2104: allocator, added xmlMallocAtomic() and modified the allocations
2105: accordingly.</li>
2106: <li>Performances: removed excessive malloc() calls, speedup of the push and
2107: xmlReader interfaces, removed excessive thread locking</li>
2108: <li>Documentation: man page (John Fleck), xmlReader documentation</li>
2109: <li>Python: adding binding for xmlCatalogAddLocal (Brent M Hendricks)</li>
2110: </ul>
2111:
2112: <h3>2.5.6: Apr 1 2003</h3>
2113: <ul>
2114: <li>Fixed W3C XML Schemas datatype, should be compliant now except for
2115: binHex and base64 which are not supported yet.</li>
2116: <li>bug fixes: non-ASCII IDs, HTML output, XInclude on large docs and
2117: XInclude entities handling, encoding detection on external subsets, XML
2118: Schemas bugs and memory leaks, HTML parser (James Bursa)</li>
2119: <li>portability: python/trio (Albert Chin), Sun compiler warnings</li>
2120: <li>documentation: added --relaxng option to xmllint man page (John)</li>
2121: <li>improved error reporting: xml:space, start/end tag mismatches, Relax NG
2122: errors</li>
2123: </ul>
2124:
2125: <h3>2.5.5: Mar 24 2003</h3>
2126: <ul>
2127: <li>Lot of fixes on the Relax NG implementation. More testing including
2128: DocBook and TEI examples.</li>
2129: <li>Increased the support for W3C XML Schemas datatype</li>
2130: <li>Several bug fixes in the URI handling layer</li>
2131: <li>Bug fixes: HTML parser, xmlReader, DTD validation, XPath, encoding
2132: conversion, line counting in the parser.</li>
2133: <li>Added support for $XMLLINT_INDENT environment variable, FTP delete</li>
2134: <li>Fixed the RPM spec file name</li>
2135: </ul>
2136:
2137: <h3>2.5.4: Feb 20 2003</h3>
2138: <ul>
2139: <li>Conformance testing and lot of fixes on Relax NG and XInclude
2140: implementation</li>
2141: <li>Implementation of XPointer element() scheme</li>
2142: <li>Bug fixes: XML parser, XInclude entities merge, validity checking on
2143: namespaces,
2144: <p>2 serialization bugs, node info generation problems, a DTD regexp
2145: generation problem.</p>
2146: </li>
2147: <li>Portability: windows updates and path canonicalization (Igor)</li>
2148: <li>A few typo fixes (Kjartan Maraas)</li>
2149: <li>Python bindings generator fixes (Stephane Bidoul)</li>
2150: </ul>
2151:
2152: <h3>2.5.3: Feb 10 2003</h3>
2153: <ul>
2154: <li>RelaxNG and XML Schemas datatypes improvements, and added a first
2155: version of RelaxNG Python bindings</li>
2156: <li>Fixes: XLink (Sean Chittenden), XInclude (Sean Chittenden), API fix for
2157: serializing namespace nodes, encoding conversion bug, XHTML1
2158: serialization</li>
2159: <li>Portability fixes: Windows (Igor), AMD 64bits RPM spec file</li>
2160: </ul>
2161:
2162: <h3>2.5.2: Feb 5 2003</h3>
2163: <ul>
2164: <li>First implementation of RelaxNG, added --relaxng flag to xmllint</li>
2165: <li>Schemas support now compiled in by default.</li>
2166: <li>Bug fixes: DTD validation, namespace checking, XInclude and entities,
2167: delegateURI in XML Catalogs, HTML parser, XML reader (Stéphane Bidoul),
2168: XPath parser and evaluation, UTF8ToUTF8 serialization, XML reader memory
2169: consumption, HTML parser, HTML serialization in the presence of
2170: namespaces</li>
2171: <li>added an HTML API to check elements and attributes.</li>
2172: <li>Documentation improvement, PDF for the tutorial (John Fleck), doc
2173: patches (Stefan Kost)</li>
2174: <li>Portability fixes: NetBSD (Julio Merino), Windows (Igor Zlatkovic)</li>
2175: <li>Added python bindings for XPointer, contextual error reporting
2176: (Stéphane Bidoul)</li>
2177: <li>URI/file escaping problems (Stefano Zacchiroli)</li>
2178: </ul>
2179:
2180: <h3>2.5.1: Jan 8 2003</h3>
2181: <ul>
2182: <li>Fixes a memory leak and configuration/compilation problems in 2.5.0</li>
2183: <li>documentation updates (John)</li>
2184: <li>a couple of XmlTextReader fixes</li>
2185: </ul>
2186:
2187: <h3>2.5.0: Jan 6 2003</h3>
2188: <ul>
2189: <li>New <a href="xmlreader.html">XmltextReader interface</a> based on C#
2190: API (with help of Stéphane Bidoul)</li>
2191: <li>Windows: more exports, including the new API (Igor)</li>
2192: <li>XInclude fallback fix</li>
2193: <li>Python: bindings for the new API, packaging (Stéphane Bidoul),
2194: drv_libxml2.py Python xml.sax driver (Stéphane Bidoul), fixes, speedup
2195: and iterators for Python-2.2 (Hannu Krosing)</li>
2196: <li>Tutorial fixes (john Fleck and Niraj Tolia) xmllint man update
2197: (John)</li>
2198: <li>Fix an XML parser bug raised by Vyacheslav Pindyura</li>
2199: <li>Fix for VMS serialization (Nigel Hall) and config (Craig A. Berry)</li>
2200: <li>Entities handling fixes</li>
2201: <li>new API to optionally track node creation and deletion (Lukas
2202: Schroeder)</li>
2203: <li>Added documentation for the XmltextReader interface and some <a
2204: href="guidelines.html">XML guidelines</a></li>
2205: </ul>
2206:
2207: <h3>2.4.30: Dec 12 2002</h3>
2208: <ul>
2209: <li>2.4.29 broke the python bindings, rereleasing</li>
2210: <li>Improvement/fixes of the XML API generator, and couple of minor code
2211: fixes.</li>
2212: </ul>
2213:
2214: <h3>2.4.29: Dec 11 2002</h3>
2215: <ul>
2216: <li>Windows fixes (Igor): Windows CE port, pthread linking, python bindings
2217: (Stéphane Bidoul), Mingw (Magnus Henoch), and export list updates</li>
2218: <li>Fix for prev in python bindings (ERDI Gergo)</li>
2219: <li>Fix for entities handling (Marcus Clarke)</li>
2220: <li>Refactored the XML and HTML dumps to a single code path, fixed XHTML1
2221: dump</li>
2222: <li>Fix for URI parsing when handling URNs with fragment identifiers</li>
2223: <li>Fix for HTTP URL escaping problem</li>
2224: <li>added an TextXmlReader (C#) like API (work in progress)</li>
2225: <li>Rewrote the API in XML generation script, includes a C parser and saves
2226: more information needed for C# bindings</li>
2227: </ul>
2228:
2229: <h3>2.4.28: Nov 22 2002</h3>
2230: <ul>
2231: <li>a couple of python binding fixes</li>
2232: <li>2 bug fixes in the XML push parser</li>
2233: <li>potential memory leak removed (Martin Stoilov)</li>
2234: <li>fix to the configure script for Unix (Dimitri Papadopoulos)</li>
2235: <li>added encoding support for XInclude parse="text"</li>
2236: <li>autodetection of XHTML1 and specific serialization rules added</li>
2237: <li>nasty threading bug fixed (William Brack)</li>
2238: </ul>
2239:
2240: <h3>2.4.27: Nov 17 2002</h3>
2241: <ul>
2242: <li>fixes for the Python bindings</li>
2243: <li>a number of bug fixes: SGML catalogs, xmlParseBalancedChunkMemory(),
2244: HTML parser, Schemas (Charles Bozeman), document fragment support
2245: (Christian Glahn), xmlReconciliateNs (Brian Stafford), XPointer,
2246: xmlFreeNode(), xmlSAXParseMemory (Peter Jones), xmlGetNodePath (Petr
2247: Pajas), entities processing</li>
2248: <li>added grep to xmllint --shell</li>
2249: <li>VMS update patch from Craig A. Berry</li>
2250: <li>cleanup of the Windows build with support for more compilers (Igor),
2251: better thread support on Windows</li>
2252: <li>cleanup of Unix Makefiles and spec file</li>
2253: <li>Improvements to the documentation (John Fleck)</li>
2254: </ul>
2255:
2256: <h3>2.4.26: Oct 18 2002</h3>
2257: <ul>
2258: <li>Patches for Windows CE port, improvements on Windows paths handling</li>
2259: <li>Fixes to the validation code (DTD and Schemas), xmlNodeGetPath() ,
2260: HTML serialization, Namespace compliance, and a number of small
2261: problems</li>
2262: </ul>
2263:
2264: <h3>2.4.25: Sep 26 2002</h3>
2265: <ul>
2266: <li>A number of bug fixes: XPath, validation, Python bindings, DOM and
2267: tree, xmlI/O, Html</li>
2268: <li>Serious rewrite of XInclude</li>
2269: <li>Made XML Schemas regexp part of the default build and APIs, small fix
2270: and improvement of the regexp core</li>
2271: <li>Changed the validation code to reuse XML Schemas regexp APIs</li>
2272: <li>Better handling of Windows file paths, improvement of Makefiles (Igor,
2273: Daniel Gehriger, Mark Vakoc)</li>
2274: <li>Improved the python I/O bindings, the tests, added resolver and regexp
2275: APIs</li>
2276: <li>New logos from Marc Liyanage</li>
2277: <li>Tutorial improvements: John Fleck, Christopher Harris</li>
2278: <li>Makefile: Fixes for AMD x86_64 (Mandrake), DESTDIR (Christophe
2279: Merlet)</li>
2280: <li>removal of all stderr/perror use for error reporting</li>
2281: <li>Better error reporting: XPath and DTD validation</li>
2282: <li>update of the trio portability layer (Bjorn Reese)</li>
2283: </ul>
2284:
2285: <p><strong>2.4.24: Aug 22 2002</strong></p>
2286: <ul>
2287: <li>XPath fixes (William), xf:escape-uri() (Wesley Terpstra)</li>
2288: <li>Python binding fixes: makefiles (William), generator, rpm build, x86-64
2289: (fcrozat)</li>
2290: <li>HTML <style> and boolean attributes serializer fixes</li>
2291: <li>C14N improvements by Aleksey</li>
2292: <li>doc cleanups: Rick Jones</li>
2293: <li>Windows compiler makefile updates: Igor and Elizabeth Barham</li>
2294: <li>XInclude: implementation of fallback and xml:base fixup added</li>
2295: </ul>
2296:
2297: <h3>2.4.23: July 6 2002</h3>
2298: <ul>
2299: <li>performances patches: Peter Jacobi</li>
2300: <li>c14n fixes, testsuite and performances: Aleksey Sanin</li>
2301: <li>added xmlDocFormatDump: Chema Celorio</li>
2302: <li>new tutorial: John Fleck</li>
2303: <li>new hash functions and performances: Sander Vesik, portability fix from
2304: Peter Jacobi</li>
2305: <li>a number of bug fixes: XPath (William Brack, Richard Jinks), XML and
2306: HTML parsers, ID lookup function</li>
2307: <li>removal of all remaining sprintf: Aleksey Sanin</li>
2308: </ul>
2309:
2310: <h3>2.4.22: May 27 2002</h3>
2311: <ul>
2312: <li>a number of bug fixes: configure scripts, base handling, parser, memory
2313: usage, HTML parser, XPath, documentation (Christian Cornelssen),
2314: indentation, URI parsing</li>
2315: <li>Optimizations for XMLSec, fixing and making public some of the network
2316: protocol handlers (Aleksey)</li>
2317: <li>performance patch from Gary Pennington</li>
2318: <li>Charles Bozeman provided date and time support for XML Schemas
2319: datatypes</li>
2320: </ul>
2321:
2322: <h3>2.4.21: Apr 29 2002</h3>
2323:
2324: <p>This release is both a bug fix release and also contains the early XML
2325: Schemas <a href="http://www.w3.org/TR/xmlschema-1/">structures</a> and <a
2326: href="http://www.w3.org/TR/xmlschema-2/">datatypes</a> code, beware, all
2327: interfaces are likely to change, there is huge holes, it is clearly a work in
2328: progress and don't even think of putting this code in a production system,
2329: it's actually not compiled in by default. The real fixes are:</p>
2330: <ul>
2331: <li>a couple of bugs or limitations introduced in 2.4.20</li>
2332: <li>patches for Borland C++ and MSC by Igor</li>
2333: <li>some fixes on XPath strings and conformance patches by Richard
2334: Jinks</li>
2335: <li>patch from Aleksey for the ExcC14N specification</li>
2336: <li>OSF/1 bug fix by Bjorn</li>
2337: </ul>
2338:
2339: <h3>2.4.20: Apr 15 2002</h3>
2340: <ul>
2341: <li>bug fixes: file descriptor leak, XPath, HTML output, DTD validation</li>
2342: <li>XPath conformance testing by Richard Jinks</li>
2343: <li>Portability fixes: Solaris, MPE/iX, Windows, OSF/1, python bindings,
2344: libxml.m4</li>
2345: </ul>
2346:
2347: <h3>2.4.19: Mar 25 2002</h3>
2348: <ul>
2349: <li>bug fixes: half a dozen XPath bugs, Validation, ISO-Latin to UTF8
2350: encoder</li>
2351: <li>portability fixes in the HTTP code</li>
2352: <li>memory allocation checks using valgrind, and profiling tests</li>
2353: <li>revamp of the Windows build and Makefiles</li>
2354: </ul>
2355:
2356: <h3>2.4.18: Mar 18 2002</h3>
2357: <ul>
2358: <li>bug fixes: tree, SAX, canonicalization, validation, portability,
2359: XPath</li>
2360: <li>removed the --with-buffer option it was becoming unmaintainable</li>
2361: <li>serious cleanup of the Python makefiles</li>
2362: <li>speedup patch to XPath very effective for DocBook stylesheets</li>
2363: <li>Fixes for Windows build, cleanup of the documentation</li>
2364: </ul>
2365:
2366: <h3>2.4.17: Mar 8 2002</h3>
2367: <ul>
2368: <li>a lot of bug fixes, including "namespace nodes have no parents in
2369: XPath"</li>
2370: <li>fixed/improved the Python wrappers, added more examples and more
2371: regression tests, XPath extension functions can now return node-sets</li>
2372: <li>added the XML Canonicalization support from Aleksey Sanin</li>
2373: </ul>
2374:
2375: <h3>2.4.16: Feb 20 2002</h3>
2376: <ul>
2377: <li>a lot of bug fixes, most of them were triggered by the XML Testsuite
2378: from OASIS and W3C. Compliance has been significantly improved.</li>
2379: <li>a couple of portability fixes too.</li>
2380: </ul>
2381:
2382: <h3>2.4.15: Feb 11 2002</h3>
2383: <ul>
2384: <li>Fixed the Makefiles, especially the python module ones</li>
2385: <li>A few bug fixes and cleanup</li>
2386: <li>Includes cleanup</li>
2387: </ul>
2388:
2389: <h3>2.4.14: Feb 8 2002</h3>
2390: <ul>
2391: <li>Change of License to the <a
2392: href="http://www.opensource.org/licenses/mit-license.html">MIT
2393: License</a> basically for integration in XFree86 codebase, and removing
2394: confusion around the previous dual-licensing</li>
2395: <li>added Python bindings, beta software but should already be quite
2396: complete</li>
2397: <li>a large number of fixes and cleanups, especially for all tree
2398: manipulations</li>
2399: <li>cleanup of the headers, generation of a reference API definition in
2400: XML</li>
2401: </ul>
2402:
2403: <h3>2.4.13: Jan 14 2002</h3>
2404: <ul>
2405: <li>update of the documentation: John Fleck and Charlie Bozeman</li>
2406: <li>cleanup of timing code from Justin Fletcher</li>
2407: <li>fixes for Windows and initial thread support on Win32: Igor and Serguei
2408: Narojnyi</li>
2409: <li>Cygwin patch from Robert Collins</li>
2410: <li>added xmlSetEntityReferenceFunc() for Keith Isdale work on xsldbg</li>
2411: </ul>
2412:
2413: <h3>2.4.12: Dec 7 2001</h3>
2414: <ul>
2415: <li>a few bug fixes: thread (Gary Pennington), xmllint (Geert Kloosterman),
2416: XML parser (Robin Berjon), XPointer (Danny Jamshy), I/O cleanups
2417: (robert)</li>
2418: <li>Eric Lavigne contributed project files for MacOS</li>
2419: <li>some makefiles cleanups</li>
2420: </ul>
2421:
2422: <h3>2.4.11: Nov 26 2001</h3>
2423: <ul>
2424: <li>fixed a couple of errors in the includes, fixed a few bugs, some code
2425: cleanups</li>
2426: <li>xmllint man pages improvement by Heiko Rupp</li>
2427: <li>updated VMS build instructions from John A Fotheringham</li>
2428: <li>Windows Makefiles updates from Igor</li>
2429: </ul>
2430:
2431: <h3>2.4.10: Nov 10 2001</h3>
2432: <ul>
2433: <li>URI escaping fix (Joel Young)</li>
2434: <li>added xmlGetNodePath() (for paths or XPointers generation)</li>
2435: <li>Fixes namespace handling problems when using DTD and validation</li>
2436: <li>improvements on xmllint: Morus Walter patches for --format and
2437: --encode, Stefan Kost and Heiko Rupp improvements on the --shell</li>
2438: <li>fixes for xmlcatalog linking pointed by Weiqi Gao</li>
2439: <li>fixes to the HTML parser</li>
2440: </ul>
2441:
2442: <h3>2.4.9: Nov 6 2001</h3>
2443: <ul>
2444: <li>fixes more catalog bugs</li>
2445: <li>avoid a compilation problem, improve xmlGetLineNo()</li>
2446: </ul>
2447:
2448: <h3>2.4.8: Nov 4 2001</h3>
2449: <ul>
2450: <li>fixed SGML catalogs broken in previous release, updated xmlcatalog
2451: tool</li>
2452: <li>fixed a compile errors and some includes troubles.</li>
2453: </ul>
2454:
2455: <h3>2.4.7: Oct 30 2001</h3>
2456: <ul>
2457: <li>exported some debugging interfaces</li>
2458: <li>serious rewrite of the catalog code</li>
2459: <li>integrated Gary Pennington thread safety patch, added configure option
2460: and regression tests</li>
2461: <li>removed an HTML parser bug</li>
2462: <li>fixed a couple of potentially serious validation bugs</li>
2463: <li>integrated the SGML DocBook support in xmllint</li>
2464: <li>changed the nanoftp anonymous login passwd</li>
2465: <li>some I/O cleanup and a couple of interfaces for Perl wrapper</li>
2466: <li>general bug fixes</li>
2467: <li>updated xmllint man page by John Fleck</li>
2468: <li>some VMS and Windows updates</li>
2469: </ul>
2470:
2471: <h3>2.4.6: Oct 10 2001</h3>
2472: <ul>
2473: <li>added an updated man pages by John Fleck</li>
2474: <li>portability and configure fixes</li>
2475: <li>an infinite loop on the HTML parser was removed (William)</li>
2476: <li>Windows makefile patches from Igor</li>
2477: <li>fixed half a dozen bugs reported for libxml or libxslt</li>
2478: <li>updated xmlcatalog to be able to modify SGML super catalogs</li>
2479: </ul>
2480:
2481: <h3>2.4.5: Sep 14 2001</h3>
2482: <ul>
2483: <li>Remove a few annoying bugs in 2.4.4</li>
2484: <li>forces the HTML serializer to output decimal charrefs since some
2485: version of Netscape can't handle hexadecimal ones</li>
2486: </ul>
2487:
2488: <h3>1.8.16: Sep 14 2001</h3>
2489: <ul>
2490: <li>maintenance release of the old libxml1 branch, couple of bug and
2491: portability fixes</li>
2492: </ul>
2493:
2494: <h3>2.4.4: Sep 12 2001</h3>
2495: <ul>
2496: <li>added --convert to xmlcatalog, bug fixes and cleanups of XML
2497: Catalog</li>
2498: <li>a few bug fixes and some portability changes</li>
2499: <li>some documentation cleanups</li>
2500: </ul>
2501:
2502: <h3>2.4.3: Aug 23 2001</h3>
2503: <ul>
2504: <li>XML Catalog support see the doc</li>
2505: <li>New NaN/Infinity floating point code</li>
2506: <li>A few bug fixes</li>
2507: </ul>
2508:
2509: <h3>2.4.2: Aug 15 2001</h3>
2510: <ul>
2511: <li>adds xmlLineNumbersDefault() to control line number generation</li>
2512: <li>lot of bug fixes</li>
2513: <li>the Microsoft MSC projects files should now be up to date</li>
2514: <li>inheritance of namespaces from DTD defaulted attributes</li>
2515: <li>fixes a serious potential security bug</li>
2516: <li>added a --format option to xmllint</li>
2517: </ul>
2518:
2519: <h3>2.4.1: July 24 2001</h3>
2520: <ul>
2521: <li>possibility to keep line numbers in the tree</li>
2522: <li>some computation NaN fixes</li>
2523: <li>extension of the XPath API</li>
2524: <li>cleanup for alpha and ia64 targets</li>
2525: <li>patch to allow saving through HTTP PUT or POST</li>
2526: </ul>
2527:
2528: <h3>2.4.0: July 10 2001</h3>
2529: <ul>
2530: <li>Fixed a few bugs in XPath, validation, and tree handling.</li>
2531: <li>Fixed XML Base implementation, added a couple of examples to the
2532: regression tests</li>
2533: <li>A bit of cleanup</li>
2534: </ul>
2535:
2536: <h3>2.3.14: July 5 2001</h3>
2537: <ul>
2538: <li>fixed some entities problems and reduce memory requirement when
2539: substituting them</li>
2540: <li>lots of improvements in the XPath queries interpreter can be
2541: substantially faster</li>
2542: <li>Makefiles and configure cleanups</li>
2543: <li>Fixes to XPath variable eval, and compare on empty node set</li>
2544: <li>HTML tag closing bug fixed</li>
2545: <li>Fixed an URI reference computation problem when validating</li>
2546: </ul>
2547:
2548: <h3>2.3.13: June 28 2001</h3>
2549: <ul>
2550: <li>2.3.12 configure.in was broken as well as the push mode XML parser</li>
2551: <li>a few more fixes for compilation on Windows MSC by Yon Derek</li>
2552: </ul>
2553:
2554: <h3>1.8.14: June 28 2001</h3>
2555: <ul>
2556: <li>Zbigniew Chyla gave a patch to use the old XML parser in push mode</li>
2557: <li>Small Makefile fix</li>
2558: </ul>
2559:
2560: <h3>2.3.12: June 26 2001</h3>
2561: <ul>
2562: <li>lots of cleanup</li>
2563: <li>a couple of validation fix</li>
2564: <li>fixed line number counting</li>
2565: <li>fixed serious problems in the XInclude processing</li>
2566: <li>added support for UTF8 BOM at beginning of entities</li>
2567: <li>fixed a strange gcc optimizer bugs in xpath handling of float, gcc-3.0
2568: miscompile uri.c (William), Thomas Leitner provided a fix for the
2569: optimizer on Tru64</li>
2570: <li>incorporated Yon Derek and Igor Zlatkovic fixes and improvements for
2571: compilation on Windows MSC</li>
2572: <li>update of libxml-doc.el (Felix Natter)</li>
2573: <li>fixed 2 bugs in URI normalization code</li>
2574: </ul>
2575:
2576: <h3>2.3.11: June 17 2001</h3>
2577: <ul>
2578: <li>updates to trio, Makefiles and configure should fix some portability
2579: problems (alpha)</li>
2580: <li>fixed some HTML serialization problems (pre, script, and block/inline
2581: handling), added encoding aware APIs, cleanup of this code</li>
2582: <li>added xmlHasNsProp()</li>
2583: <li>implemented a specific PI for encoding support in the DocBook SGML
2584: parser</li>
2585: <li>some XPath fixes (-Infinity, / as a function parameter and namespaces
2586: node selection)</li>
2587: <li>fixed a performance problem and an error in the validation code</li>
2588: <li>fixed XInclude routine to implement the recursive behaviour</li>
2589: <li>fixed xmlFreeNode problem when libxml is included statically twice</li>
2590: <li>added --version to xmllint for bug reports</li>
2591: </ul>
2592:
2593: <h3>2.3.10: June 1 2001</h3>
2594: <ul>
2595: <li>fixed the SGML catalog support</li>
2596: <li>a number of reported bugs got fixed, in XPath, iconv detection,
2597: XInclude processing</li>
2598: <li>XPath string function should now handle unicode correctly</li>
2599: </ul>
2600:
2601: <h3>2.3.9: May 19 2001</h3>
2602:
2603: <p>Lots of bugfixes, and added a basic SGML catalog support:</p>
2604: <ul>
2605: <li>HTML push bugfix #54891 and another patch from Jonas Borgström</li>
2606: <li>some serious speed optimization again</li>
2607: <li>some documentation cleanups</li>
2608: <li>trying to get better linking on Solaris (-R)</li>
2609: <li>XPath API cleanup from Thomas Broyer</li>
2610: <li>Validation bug fixed #54631, added a patch from Gary Pennington, fixed
2611: xmlValidGetValidElements()</li>
2612: <li>Added an INSTALL file</li>
2613: <li>Attribute removal added to API: #54433</li>
2614: <li>added a basic support for SGML catalogs</li>
2615: <li>fixed xmlKeepBlanksDefault(0) API</li>
2616: <li>bugfix in xmlNodeGetLang()</li>
2617: <li>fixed a small configure portability problem</li>
2618: <li>fixed an inversion of SYSTEM and PUBLIC identifier in HTML document</li>
2619: </ul>
2620:
2621: <h3>1.8.13: May 14 2001</h3>
2622: <ul>
2623: <li>bugfixes release of the old libxml1 branch used by Gnome</li>
2624: </ul>
2625:
2626: <h3>2.3.8: May 3 2001</h3>
2627: <ul>
2628: <li>Integrated an SGML DocBook parser for the Gnome project</li>
2629: <li>Fixed a few things in the HTML parser</li>
2630: <li>Fixed some XPath bugs raised by XSLT use, tried to fix the floating
2631: point portability issue</li>
2632: <li>Speed improvement (8M/s for SAX, 3M/s for DOM, 1.5M/s for
2633: DOM+validation using the XML REC as input and a 700MHz celeron).</li>
2634: <li>incorporated more Windows cleanup</li>
2635: <li>added xmlSaveFormatFile()</li>
2636: <li>fixed problems in copying nodes with entities references (gdome)</li>
2637: <li>removed some troubles surrounding the new validation module</li>
2638: </ul>
2639:
2640: <h3>2.3.7: April 22 2001</h3>
2641: <ul>
2642: <li>lots of small bug fixes, corrected XPointer</li>
2643: <li>Non deterministic content model validation support</li>
2644: <li>added xmlDocCopyNode for gdome2</li>
2645: <li>revamped the way the HTML parser handles end of tags</li>
2646: <li>XPath: corrections of namespaces support and number formatting</li>
2647: <li>Windows: Igor Zlatkovic patches for MSC compilation</li>
2648: <li>HTML output fixes from P C Chow and William M. Brack</li>
2649: <li>Improved validation speed sensible for DocBook</li>
2650: <li>fixed a big bug with ID declared in external parsed entities</li>
2651: <li>portability fixes, update of Trio from Bjorn Reese</li>
2652: </ul>
2653:
2654: <h3>2.3.6: April 8 2001</h3>
2655: <ul>
2656: <li>Code cleanup using extreme gcc compiler warning options, found and
2657: cleared half a dozen potential problem</li>
2658: <li>the Eazel team found an XML parser bug</li>
2659: <li>cleaned up the user of some of the string formatting function. used the
2660: trio library code to provide the one needed when the platform is missing
2661: them</li>
2662: <li>xpath: removed a memory leak and fixed the predicate evaluation
2663: problem, extended the testsuite and cleaned up the result. XPointer seems
2664: broken ...</li>
2665: </ul>
2666:
2667: <h3>2.3.5: Mar 23 2001</h3>
2668: <ul>
2669: <li>Biggest change is separate parsing and evaluation of XPath expressions,
2670: there is some new APIs for this too</li>
2671: <li>included a number of bug fixes(XML push parser, 51876, notations,
2672: 52299)</li>
2673: <li>Fixed some portability issues</li>
2674: </ul>
2675:
2676: <h3>2.3.4: Mar 10 2001</h3>
2677: <ul>
2678: <li>Fixed bugs #51860 and #51861</li>
2679: <li>Added a global variable xmlDefaultBufferSize to allow default buffer
2680: size to be application tunable.</li>
2681: <li>Some cleanup in the validation code, still a bug left and this part
2682: should probably be rewritten to support ambiguous content model :-\</li>
2683: <li>Fix a couple of serious bugs introduced or raised by changes in 2.3.3
2684: parser</li>
2685: <li>Fixed another bug in xmlNodeGetContent()</li>
2686: <li>Bjorn fixed XPath node collection and Number formatting</li>
2687: <li>Fixed a loop reported in the HTML parsing</li>
2688: <li>blank space are reported even if the Dtd content model proves that they
2689: are formatting spaces, this is for XML conformance</li>
2690: </ul>
2691:
2692: <h3>2.3.3: Mar 1 2001</h3>
2693: <ul>
2694: <li>small change in XPath for XSLT</li>
2695: <li>documentation cleanups</li>
2696: <li>fix in validation by Gary Pennington</li>
2697: <li>serious parsing performances improvements</li>
2698: </ul>
2699:
2700: <h3>2.3.2: Feb 24 2001</h3>
2701: <ul>
2702: <li>chasing XPath bugs, found a bunch, completed some TODO</li>
2703: <li>fixed a Dtd parsing bug</li>
2704: <li>fixed a bug in xmlNodeGetContent</li>
2705: <li>ID/IDREF support partly rewritten by Gary Pennington</li>
2706: </ul>
2707:
2708: <h3>2.3.1: Feb 15 2001</h3>
2709: <ul>
2710: <li>some XPath and HTML bug fixes for XSLT</li>
2711: <li>small extension of the hash table interfaces for DOM gdome2
2712: implementation</li>
2713: <li>A few bug fixes</li>
2714: </ul>
2715:
2716: <h3>2.3.0: Feb 8 2001 (2.2.12 was on 25 Jan but I didn't kept track)</h3>
2717: <ul>
2718: <li>Lots of XPath bug fixes</li>
2719: <li>Add a mode with Dtd lookup but without validation error reporting for
2720: XSLT</li>
2721: <li>Add support for text node without escaping (XSLT)</li>
2722: <li>bug fixes for xmlCheckFilename</li>
2723: <li>validation code bug fixes from Gary Pennington</li>
2724: <li>Patch from Paul D. Smith correcting URI path normalization</li>
2725: <li>Patch to allow simultaneous install of libxml-devel and
2726: libxml2-devel</li>
2727: <li>the example Makefile is now fixed</li>
2728: <li>added HTML to the RPM packages</li>
2729: <li>tree copying bugfixes</li>
2730: <li>updates to Windows makefiles</li>
2731: <li>optimization patch from Bjorn Reese</li>
2732: </ul>
2733:
2734: <h3>2.2.11: Jan 4 2001</h3>
2735: <ul>
2736: <li>bunch of bug fixes (memory I/O, xpath, ftp/http, ...)</li>
2737: <li>added htmlHandleOmittedElem()</li>
2738: <li>Applied Bjorn Reese's IPV6 first patch</li>
2739: <li>Applied Paul D. Smith patches for validation of XInclude results</li>
2740: <li>added XPointer xmlns() new scheme support</li>
2741: </ul>
2742:
2743: <h3>2.2.10: Nov 25 2000</h3>
2744: <ul>
2745: <li>Fix the Windows problems of 2.2.8</li>
2746: <li>integrate OpenVMS patches</li>
2747: <li>better handling of some nasty HTML input</li>
2748: <li>Improved the XPointer implementation</li>
2749: <li>integrate a number of provided patches</li>
2750: </ul>
2751:
2752: <h3>2.2.9: Nov 25 2000</h3>
2753: <ul>
2754: <li>erroneous release :-(</li>
2755: </ul>
2756:
2757: <h3>2.2.8: Nov 13 2000</h3>
2758: <ul>
2759: <li>First version of <a href="http://www.w3.org/TR/xinclude">XInclude</a>
2760: support</li>
2761: <li>Patch in conditional section handling</li>
2762: <li>updated MS compiler project</li>
2763: <li>fixed some XPath problems</li>
2764: <li>added an URI escaping function</li>
2765: <li>some other bug fixes</li>
2766: </ul>
2767:
2768: <h3>2.2.7: Oct 31 2000</h3>
2769: <ul>
2770: <li>added message redirection</li>
2771: <li>XPath improvements (thanks TOM !)</li>
2772: <li>xmlIOParseDTD() added</li>
2773: <li>various small fixes in the HTML, URI, HTTP and XPointer support</li>
2774: <li>some cleanup of the Makefile, autoconf and the distribution content</li>
2775: </ul>
2776:
2777: <h3>2.2.6: Oct 25 2000:</h3>
2778: <ul>
2779: <li>Added an hash table module, migrated a number of internal structure to
2780: those</li>
2781: <li>Fixed a posteriori validation problems</li>
2782: <li>HTTP module cleanups</li>
2783: <li>HTML parser improvements (tag errors, script/style handling, attribute
2784: normalization)</li>
2785: <li>coalescing of adjacent text nodes</li>
2786: <li>couple of XPath bug fixes, exported the internal API</li>
2787: </ul>
2788:
2789: <h3>2.2.5: Oct 15 2000:</h3>
2790: <ul>
2791: <li>XPointer implementation and testsuite</li>
2792: <li>Lot of XPath fixes, added variable and functions registration, more
2793: tests</li>
2794: <li>Portability fixes, lots of enhancements toward an easy Windows build
2795: and release</li>
2796: <li>Late validation fixes</li>
2797: <li>Integrated a lot of contributed patches</li>
2798: <li>added memory management docs</li>
2799: <li>a performance problem when using large buffer seems fixed</li>
2800: </ul>
2801:
2802: <h3>2.2.4: Oct 1 2000:</h3>
2803: <ul>
2804: <li>main XPath problem fixed</li>
2805: <li>Integrated portability patches for Windows</li>
2806: <li>Serious bug fixes on the URI and HTML code</li>
2807: </ul>
2808:
2809: <h3>2.2.3: Sep 17 2000</h3>
2810: <ul>
2811: <li>bug fixes</li>
2812: <li>cleanup of entity handling code</li>
2813: <li>overall review of all loops in the parsers, all sprintf usage has been
2814: checked too</li>
2815: <li>Far better handling of larges Dtd. Validating against DocBook XML Dtd
2816: works smoothly now.</li>
2817: </ul>
2818:
2819: <h3>1.8.10: Sep 6 2000</h3>
2820: <ul>
2821: <li>bug fix release for some Gnome projects</li>
2822: </ul>
2823:
2824: <h3>2.2.2: August 12 2000</h3>
2825: <ul>
2826: <li>mostly bug fixes</li>
2827: <li>started adding routines to access xml parser context options</li>
2828: </ul>
2829:
2830: <h3>2.2.1: July 21 2000</h3>
2831: <ul>
2832: <li>a purely bug fixes release</li>
2833: <li>fixed an encoding support problem when parsing from a memory block</li>
2834: <li>fixed a DOCTYPE parsing problem</li>
2835: <li>removed a bug in the function allowing to override the memory
2836: allocation routines</li>
2837: </ul>
2838:
2839: <h3>2.2.0: July 14 2000</h3>
2840: <ul>
2841: <li>applied a lot of portability fixes</li>
2842: <li>better encoding support/cleanup and saving (content is now always
2843: encoded in UTF-8)</li>
2844: <li>the HTML parser now correctly handles encodings</li>
2845: <li>added xmlHasProp()</li>
2846: <li>fixed a serious problem with &#38;</li>
2847: <li>propagated the fix to FTP client</li>
2848: <li>cleanup, bugfixes, etc ...</li>
2849: <li>Added a page about <a href="encoding.html">libxml Internationalization
2850: support</a></li>
2851: </ul>
2852:
2853: <h3>1.8.9: July 9 2000</h3>
2854: <ul>
2855: <li>fixed the spec the RPMs should be better</li>
2856: <li>fixed a serious bug in the FTP implementation, released 1.8.9 to solve
2857: rpmfind users problem</li>
2858: </ul>
2859:
2860: <h3>2.1.1: July 1 2000</h3>
2861: <ul>
2862: <li>fixes a couple of bugs in the 2.1.0 packaging</li>
2863: <li>improvements on the HTML parser</li>
2864: </ul>
2865:
2866: <h3>2.1.0 and 1.8.8: June 29 2000</h3>
2867: <ul>
2868: <li>1.8.8 is mostly a commodity package for upgrading to libxml2 according
2869: to <a href="upgrade.html">new instructions</a>. It fixes a nasty problem
2870: about &#38; charref parsing</li>
2871: <li>2.1.0 also ease the upgrade from libxml v1 to the recent version. it
2872: also contains numerous fixes and enhancements:
2873: <ul>
2874: <li>added xmlStopParser() to stop parsing</li>
2875: <li>improved a lot parsing speed when there is large CDATA blocs</li>
2876: <li>includes XPath patches provided by Picdar Technology</li>
2877: <li>tried to fix as much as possible DTD validation and namespace
2878: related problems</li>
2879: <li>output to a given encoding has been added/tested</li>
2880: <li>lot of various fixes</li>
2881: </ul>
2882: </li>
2883: </ul>
2884:
2885: <h3>2.0.0: Apr 12 2000</h3>
2886: <ul>
2887: <li>First public release of libxml2. If you are using libxml, it's a good
2888: idea to check the 1.x to 2.x upgrade instructions. NOTE: while initially
2889: scheduled for Apr 3 the release occurred only on Apr 12 due to massive
2890: workload.</li>
2891: <li>The include are now located under $prefix/include/libxml (instead of
2892: $prefix/include/gnome-xml), they also are referenced by
2893: <pre>#include <libxml/xxx.h></pre>
2894: <p>instead of</p>
2895: <pre>#include "xxx.h"</pre>
2896: </li>
2897: <li>a new URI module for parsing URIs and following strictly RFC 2396</li>
2898: <li>the memory allocation routines used by libxml can now be overloaded
2899: dynamically by using xmlMemSetup()</li>
2900: <li>The previously CVS only tool tester has been renamed
2901: <strong>xmllint</strong> and is now installed as part of the libxml2
2902: package</li>
2903: <li>The I/O interface has been revamped. There is now ways to plug in
2904: specific I/O modules, either at the URI scheme detection level using
2905: xmlRegisterInputCallbacks() or by passing I/O functions when creating a
2906: parser context using xmlCreateIOParserCtxt()</li>
2907: <li>there is a C preprocessor macro LIBXML_VERSION providing the version
2908: number of the libxml module in use</li>
2909: <li>a number of optional features of libxml can now be excluded at
2910: configure time (FTP/HTTP/HTML/XPath/Debug)</li>
2911: </ul>
2912:
2913: <h3>2.0.0beta: Mar 14 2000</h3>
2914: <ul>
2915: <li>This is a first Beta release of libxml version 2</li>
2916: <li>It's available only from<a href="ftp://xmlsoft.org/libxml2/">xmlsoft.org
2917: FTP</a>, it's packaged as libxml2-2.0.0beta and available as tar and
2918: RPMs</li>
2919: <li>This version is now the head in the Gnome CVS base, the old one is
2920: available under the tag LIB_XML_1_X</li>
2921: <li>This includes a very large set of changes. From a programmatic point
2922: of view applications should not have to be modified too much, check the
2923: <a href="upgrade.html">upgrade page</a></li>
2924: <li>Some interfaces may changes (especially a bit about encoding).</li>
2925: <li>the updates includes:
2926: <ul>
2927: <li>fix I18N support. ISO-Latin-x/UTF-8/UTF-16 (nearly) seems correctly
2928: handled now</li>
2929: <li>Better handling of entities, especially well-formedness checking
2930: and proper PEref extensions in external subsets</li>
2931: <li>DTD conditional sections</li>
2932: <li>Validation now correctly handle entities content</li>
2933: <li><a href="http://rpmfind.net/tools/gdome/messages/0039.html">change
2934: structures to accommodate DOM</a></li>
2935: </ul>
2936: </li>
2937: <li>Serious progress were made toward compliance, <a
2938: href="conf/result.html">here are the result of the test</a> against the
2939: OASIS testsuite (except the Japanese tests since I don't support that
2940: encoding yet). This URL is rebuilt every couple of hours using the CVS
2941: head version.</li>
2942: </ul>
2943:
2944: <h3>1.8.7: Mar 6 2000</h3>
2945: <ul>
2946: <li>This is a bug fix release:</li>
2947: <li>It is possible to disable the ignorable blanks heuristic used by
2948: libxml-1.x, a new function xmlKeepBlanksDefault(0) will allow this. Note
2949: that for adherence to XML spec, this behaviour will be disabled by
2950: default in 2.x . The same function will allow to keep compatibility for
2951: old code.</li>
2952: <li>Blanks in <a> </a> constructs are not ignored anymore,
2953: avoiding heuristic is really the Right Way :-\</li>
2954: <li>The unchecked use of snprintf which was breaking libxml-1.8.6
2955: compilation on some platforms has been fixed</li>
2956: <li>nanoftp.c nanohttp.c: Fixed '#' and '?' stripping when processing
2957: URIs</li>
2958: </ul>
2959:
2960: <h3>1.8.6: Jan 31 2000</h3>
2961: <ul>
2962: <li>added a nanoFTP transport module, debugged until the new version of <a
2963: href="http://rpmfind.net/linux/rpm2html/rpmfind.html">rpmfind</a> can use
2964: it without troubles</li>
2965: </ul>
2966:
2967: <h3>1.8.5: Jan 21 2000</h3>
2968: <ul>
2969: <li>adding APIs to parse a well balanced chunk of XML (production <a
2970: href="http://www.w3.org/TR/REC-xml#NT-content">[43] content</a> of the
2971: XML spec)</li>
2972: <li>fixed a hideous bug in xmlGetProp pointed by Rune.Djurhuus@fast.no</li>
2973: <li>Jody Goldberg <jgoldberg@home.com> provided another patch trying
2974: to solve the zlib checks problems</li>
2975: <li>The current state in gnome CVS base is expected to ship as 1.8.5 with
2976: gnumeric soon</li>
2977: </ul>
2978:
2979: <h3>1.8.4: Jan 13 2000</h3>
2980: <ul>
2981: <li>bug fixes, reintroduced xmlNewGlobalNs(), fixed xmlNewNs()</li>
2982: <li>all exit() call should have been removed from libxml</li>
2983: <li>fixed a problem with INCLUDE_WINSOCK on WIN32 platform</li>
2984: <li>added newDocFragment()</li>
2985: </ul>
2986:
2987: <h3>1.8.3: Jan 5 2000</h3>
2988: <ul>
2989: <li>a Push interface for the XML and HTML parsers</li>
2990: <li>a shell-like interface to the document tree (try tester --shell :-)</li>
2991: <li>lots of bug fixes and improvement added over XMas holidays</li>
2992: <li>fixed the DTD parsing code to work with the xhtml DTD</li>
2993: <li>added xmlRemoveProp(), xmlRemoveID() and xmlRemoveRef()</li>
2994: <li>Fixed bugs in xmlNewNs()</li>
2995: <li>External entity loading code has been revamped, now it uses
2996: xmlLoadExternalEntity(), some fix on entities processing were added</li>
2997: <li>cleaned up WIN32 includes of socket stuff</li>
2998: </ul>
2999:
3000: <h3>1.8.2: Dec 21 1999</h3>
3001: <ul>
3002: <li>I got another problem with includes and C++, I hope this issue is fixed
3003: for good this time</li>
3004: <li>Added a few tree modification functions: xmlReplaceNode,
3005: xmlAddPrevSibling, xmlAddNextSibling, xmlNodeSetName and
3006: xmlDocSetRootElement</li>
3007: <li>Tried to improve the HTML output with help from <a
3008: href="mailto:clahey@umich.edu">Chris Lahey</a></li>
3009: </ul>
3010:
3011: <h3>1.8.1: Dec 18 1999</h3>
3012: <ul>
3013: <li>various patches to avoid troubles when using libxml with C++ compilers
3014: the "namespace" keyword and C escaping in include files</li>
3015: <li>a problem in one of the core macros IS_CHAR was corrected</li>
3016: <li>fixed a bug introduced in 1.8.0 breaking default namespace processing,
3017: and more specifically the Dia application</li>
3018: <li>fixed a posteriori validation (validation after parsing, or by using a
3019: Dtd not specified in the original document)</li>
3020: <li>fixed a bug in</li>
3021: </ul>
3022:
3023: <h3>1.8.0: Dec 12 1999</h3>
3024: <ul>
3025: <li>cleanup, especially memory wise</li>
3026: <li>the parser should be more reliable, especially the HTML one, it should
3027: not crash, whatever the input !</li>
3028: <li>Integrated various patches, especially a speedup improvement for large
3029: dataset from <a href="mailto:cnygard@bellatlantic.net">Carl Nygard</a>,
3030: configure with --with-buffers to enable them.</li>
3031: <li>attribute normalization, oops should have been added long ago !</li>
3032: <li>attributes defaulted from DTDs should be available, xmlSetProp() now
3033: does entities escaping by default.</li>
3034: </ul>
3035:
3036: <h3>1.7.4: Oct 25 1999</h3>
3037: <ul>
3038: <li>Lots of HTML improvement</li>
3039: <li>Fixed some errors when saving both XML and HTML</li>
3040: <li>More examples, the regression tests should now look clean</li>
3041: <li>Fixed a bug with contiguous charref</li>
3042: </ul>
3043:
3044: <h3>1.7.3: Sep 29 1999</h3>
3045: <ul>
3046: <li>portability problems fixed</li>
3047: <li>snprintf was used unconditionally, leading to link problems on system
3048: were it's not available, fixed</li>
3049: </ul>
3050:
3051: <h3>1.7.1: Sep 24 1999</h3>
3052: <ul>
3053: <li>The basic type for strings manipulated by libxml has been renamed in
3054: 1.7.1 from <strong>CHAR</strong> to <strong>xmlChar</strong>. The reason
3055: is that CHAR was conflicting with a predefined type on Windows. However
3056: on non WIN32 environment, compatibility is provided by the way of a
3057: <strong>#define </strong>.</li>
3058: <li>Changed another error : the use of a structure field called errno, and
3059: leading to troubles on platforms where it's a macro</li>
3060: </ul>
3061:
3062: <h3>1.7.0: Sep 23 1999</h3>
3063: <ul>
3064: <li>Added the ability to fetch remote DTD or parsed entities, see the <a
3065: href="html/libxml-nanohttp.html">nanohttp</a> module.</li>
3066: <li>Added an errno to report errors by another mean than a simple printf
3067: like callback</li>
3068: <li>Finished ID/IDREF support and checking when validation</li>
3069: <li>Serious memory leaks fixed (there is now a <a
3070: href="html/libxml-xmlmemory.html">memory wrapper</a> module)</li>
3071: <li>Improvement of <a href="http://www.w3.org/TR/xpath">XPath</a>
3072: implementation</li>
3073: <li>Added an HTML parser front-end</li>
3074: </ul>
3075:
3076: <h2><a name="XML">XML</a></h2>
3077:
3078: <p><a href="http://www.w3.org/TR/REC-xml">XML is a standard</a> for
3079: markup-based structured documents. Here is <a name="example">an example XML
3080: document</a>:</p>
3081: <pre><?xml version="1.0"?>
3082: <EXAMPLE prop1="gnome is great" prop2="&amp; linux too">
3083: <head>
3084: <title>Welcome to Gnome</title>
3085: </head>
3086: <chapter>
3087: <title>The Linux adventure</title>
3088: <p>bla bla bla ...</p>
3089: <image href="linus.gif"/>
3090: <p>...</p>
3091: </chapter>
3092: </EXAMPLE></pre>
3093:
3094: <p>The first line specifies that it is an XML document and gives useful
3095: information about its encoding. Then the rest of the document is a text
3096: format whose structure is specified by tags between brackets. <strong>Each
3097: tag opened has to be closed</strong>. XML is pedantic about this. However, if
3098: a tag is empty (no content), a single tag can serve as both the opening and
3099: closing tag if it ends with <code>/></code> rather than with
3100: <code>></code>. Note that, for example, the image tag has no content (just
3101: an attribute) and is closed by ending the tag with <code>/></code>.</p>
3102:
3103: <p>XML can be applied successfully to a wide range of tasks, ranging from
3104: long term structured document maintenance (where it follows the steps of
3105: SGML) to simple data encoding mechanisms like configuration file formatting
3106: (glade), spreadsheets (gnumeric), or even shorter lived documents such as
3107: WebDAV where it is used to encode remote calls between a client and a
3108: server.</p>
3109:
3110: <h2><a name="XSLT">XSLT</a></h2>
3111:
3112: <p>Check <a href="http://xmlsoft.org/XSLT">the separate libxslt page</a></p>
3113:
3114: <p><a href="http://www.w3.org/TR/xslt">XSL Transformations</a>, is a
3115: language for transforming XML documents into other XML documents (or
3116: HTML/textual output).</p>
3117:
3118: <p>A separate library called libxslt is available implementing XSLT-1.0 for
3119: libxml2. This module "libxslt" too can be found in the Gnome SVN base.</p>
3120:
3121: <p>You can check the progresses on the libxslt <a
3122: href="http://xmlsoft.org/XSLT/ChangeLog.html">Changelog</a>.</p>
3123:
3124: <h2><a name="Python">Python and bindings</a></h2>
3125:
3126: <p>There are a number of language bindings and wrappers available for
3127: libxml2, the list below is not exhaustive. Please contact the <a
3128: href="http://mail.gnome.org/mailman/listinfo/xml-bindings">xml-bindings@gnome.org</a>
3129: (<a href="http://mail.gnome.org/archives/xml-bindings/">archives</a>) in
3130: order to get updates to this list or to discuss the specific topic of libxml2
3131: or libxslt wrappers or bindings:</p>
3132: <ul>
3133: <li><a href="http://libxmlplusplus.sourceforge.net/">Libxml++</a> seems the
3134: most up-to-date C++ bindings for libxml2, check the <a
3135: href="http://libxmlplusplus.sourceforge.net/reference/html/hierarchy.html">documentation</a>
3136: and the <a
3137: href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/libxmlplusplus/libxml%2b%2b/examples/">examples</a>.</li>
3138: <li>There is another <a href="http://libgdome-cpp.berlios.de/">C++ wrapper
3139: based on the gdome2 bindings</a> maintained by Tobias Peters.</li>
3140: <li>and a third C++ wrapper by Peter Jones <pjones@pmade.org>
3141: <p>Website: <a
3142: href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
3143: </li>
3144: <li>XML::LibXML <a href="http://cpan.uwinnipeg.ca/dist/XML-LibXML">Perl
3145: bindings</a> are available on CPAN, as well as XML::LibXSLT
3146: <a href="http://cpan.uwinnipeg.ca/dist/XML-LibXSLT">Perl libxslt
3147: bindings</a>.</li>
3148: <li>If you're interested into scripting XML processing, have a look at <a
3149: href="http://xsh.sourceforge.net/">XSH</a> an XML editing shell based on
3150: Libxml2 Perl bindings.</li>
3151: <li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provides an
3152: earlier version of the libxml/libxslt <a
3153: href="http://www.rexx.com/~dkuhlman">wrappers for Python</a>.</li>
3154: <li>Gopal.V and Peter Minten develop <a
3155: href="http://savannah.gnu.org/projects/libxmlsharp">libxml#</a>, a set of
3156: C# libxml2 bindings.</li>
3157: <li>Petr Kozelka provides <a
3158: href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
3159: libxml2</a> with Kylix, Delphi and other Pascal compilers.</li>
3160: <li>Uwe Fechner also provides <a
3161: href="http://sourceforge.net/projects/idom2-pas/">idom2</a>, a DOM2
3162: implementation for Kylix2/D5/D6 from Borland.</li>
3163: <li>There is <a href="http://libxml.rubyforge.org/">bindings for Ruby</a>
3164: and libxml2 bindings are also available in Ruby through the <a
3165: href="http://libgdome-ruby.berlios.de/">libgdome-ruby</a> module
3166: maintained by Tobias Peters.</li>
3167: <li>Steve Ball and contributors maintains <a
3168: href="http://tclxml.sourceforge.net/">libxml2 and libxslt bindings for
3169: Tcl</a>.</li>
3170: <li>libxml2 and libxslt are the default XML libraries for PHP5.</li>
3171: <li><a href="http://savannah.gnu.org/projects/classpathx/">LibxmlJ</a> is
3172: an effort to create a 100% JAXP-compatible Java wrapper for libxml2 and
3173: libxslt as part of GNU ClasspathX project.</li>
3174: <li>Patrick McPhee provides Rexx bindings fof libxml2 and libxslt, look for
3175: <a href="http://www.interlog.com/~ptjm/software.html">RexxXML</a>.</li>
3176: <li><a
3177: href="http://www.satimage.fr/software/en/xml_suite.html">Satimage</a>
3178: provides <a
3179: href="http://www.satimage.fr/software/en/downloads_osaxen.html">XMLLib
3180: osax</a>. This is an osax for Mac OS X with a set of commands to
3181: implement in AppleScript the XML DOM, XPATH and XSLT. Also includes
3182: commands for Property-lists (Apple's fast lookup table XML format.)</li>
3183: <li>Francesco Montorsi developped <a
3184: href="https://sourceforge.net/project/showfiles.php?group_id=51305&package_id=45182">wxXml2</a>
3185: wrappers that interface libxml2, allowing wxWidgets applications to
3186: load/save/edit XML instances.</li>
3187: </ul>
3188:
3189: <p>The distribution includes a set of Python bindings, which are guaranteed
3190: to be maintained as part of the library in the future, though the Python
3191: interface have not yet reached the completeness of the C API.</p>
3192:
3193: <p>Note that some of the Python purist dislike the default set of Python
3194: bindings, rather than complaining I suggest they have a look at <a
1.1.1.2 ! misho 3195: href="http://lxml.de/">lxml the more pythonic bindings for libxml2
1.1 misho 3196: and libxslt</a> and <a
1.1.1.2 ! misho 3197: href="http://lxml.de/mailinglist/">check the mailing-list</a>.</p>
1.1 misho 3198:
3199: <p><a href="mailto:stephane.bidoul@softwareag.com">Stéphane Bidoul</a>
3200: maintains <a href="http://users.skynet.be/sbi/libxml-python/">a Windows port
3201: of the Python bindings</a>.</p>
3202:
3203: <p>Note to people interested in building bindings, the API is formalized as
3204: <a href="libxml2-api.xml">an XML API description file</a> which allows to
3205: automate a large part of the Python bindings, this includes function
3206: descriptions, enums, structures, typedefs, etc... The Python script used to
3207: build the bindings is python/generator.py in the source distribution.</p>
3208:
3209: <p>To install the Python bindings there are 2 options:</p>
3210: <ul>
3211: <li>If you use an RPM based distribution, simply install the <a
3212: href="http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python">libxml2-python
3213: RPM</a> (and if needed the <a
3214: href="http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python">libxslt-python
3215: RPM</a>).</li>
3216: <li>Otherwise use the <a href="ftp://xmlsoft.org/libxml2/python/">libxml2-python
3217: module distribution</a> corresponding to your installed version of
3218: libxml2 and libxslt. Note that to install it you will need both libxml2
3219: and libxslt installed and run "python setup.py build install" in the
3220: module tree.</li>
3221: </ul>
3222:
3223: <p>The distribution includes a set of examples and regression tests for the
3224: python bindings in the <code>python/tests</code> directory. Here are some
3225: excerpts from those tests:</p>
3226:
3227: <h3>tst.py:</h3>
3228:
3229: <p>This is a basic test of the file interface and DOM navigation:</p>
3230: <pre>import libxml2, sys
3231:
3232: doc = libxml2.parseFile("tst.xml")
3233: if doc.name != "tst.xml":
3234: print "doc.name failed"
3235: sys.exit(1)
3236: root = doc.children
3237: if root.name != "doc":
3238: print "root.name failed"
3239: sys.exit(1)
3240: child = root.children
3241: if child.name != "foo":
3242: print "child.name failed"
3243: sys.exit(1)
3244: doc.freeDoc()</pre>
3245:
3246: <p>The Python module is called libxml2; parseFile is the equivalent of
3247: xmlParseFile (most of the bindings are automatically generated, and the xml
3248: prefix is removed and the casing convention are kept). All node seen at the
3249: binding level share the same subset of accessors:</p>
3250: <ul>
3251: <li><code>name</code> : returns the node name</li>
3252: <li><code>type</code> : returns a string indicating the node type</li>
3253: <li><code>content</code> : returns the content of the node, it is based on
3254: xmlNodeGetContent() and hence is recursive.</li>
3255: <li><code>parent</code> , <code>children</code>, <code>last</code>,
3256: <code>next</code>, <code>prev</code>, <code>doc</code>,
3257: <code>properties</code>: pointing to the associated element in the tree,
3258: those may return None in case no such link exists.</li>
3259: </ul>
3260:
3261: <p>Also note the need to explicitly deallocate documents with freeDoc() .
3262: Reference counting for libxml2 trees would need quite a lot of work to
3263: function properly, and rather than risk memory leaks if not implemented
3264: correctly it sounds safer to have an explicit function to free a tree. The
3265: wrapper python objects like doc, root or child are them automatically garbage
3266: collected.</p>
3267:
3268: <h3>validate.py:</h3>
3269:
3270: <p>This test check the validation interfaces and redirection of error
3271: messages:</p>
3272: <pre>import libxml2
3273:
3274: #deactivate error messages from the validation
3275: def noerr(ctx, str):
3276: pass
3277:
3278: libxml2.registerErrorHandler(noerr, None)
3279:
3280: ctxt = libxml2.createFileParserCtxt("invalid.xml")
3281: ctxt.validate(1)
3282: ctxt.parseDocument()
3283: doc = ctxt.doc()
3284: valid = ctxt.isValid()
3285: doc.freeDoc()
3286: if valid != 0:
3287: print "validity check failed"</pre>
3288:
3289: <p>The first thing to notice is the call to registerErrorHandler(), it
3290: defines a new error handler global to the library. It is used to avoid seeing
3291: the error messages when trying to validate the invalid document.</p>
3292:
3293: <p>The main interest of that test is the creation of a parser context with
3294: createFileParserCtxt() and how the behaviour can be changed before calling
3295: parseDocument() . Similarly the information resulting from the parsing phase
3296: is also available using context methods.</p>
3297:
3298: <p>Contexts like nodes are defined as class and the libxml2 wrappers maps the
3299: C function interfaces in terms of objects method as much as possible. The
3300: best to get a complete view of what methods are supported is to look at the
3301: libxml2.py module containing all the wrappers.</p>
3302:
3303: <h3>push.py:</h3>
3304:
3305: <p>This test show how to activate the push parser interface:</p>
3306: <pre>import libxml2
3307:
3308: ctxt = libxml2.createPushParser(None, "<foo", 4, "test.xml")
3309: ctxt.parseChunk("/>", 2, 1)
3310: doc = ctxt.doc()
3311:
3312: doc.freeDoc()</pre>
3313:
3314: <p>The context is created with a special call based on the
3315: xmlCreatePushParser() from the C library. The first argument is an optional
3316: SAX callback object, then the initial set of data, the length and the name of
3317: the resource in case URI-References need to be computed by the parser.</p>
3318:
3319: <p>Then the data are pushed using the parseChunk() method, the last call
3320: setting the third argument terminate to 1.</p>
3321:
3322: <h3>pushSAX.py:</h3>
3323:
3324: <p>this test show the use of the event based parsing interfaces. In this case
3325: the parser does not build a document, but provides callback information as
3326: the parser makes progresses analyzing the data being provided:</p>
3327: <pre>import libxml2
3328: log = ""
3329:
3330: class callback:
3331: def startDocument(self):
3332: global log
3333: log = log + "startDocument:"
3334:
3335: def endDocument(self):
3336: global log
3337: log = log + "endDocument:"
3338:
3339: def startElement(self, tag, attrs):
3340: global log
3341: log = log + "startElement %s %s:" % (tag, attrs)
3342:
3343: def endElement(self, tag):
3344: global log
3345: log = log + "endElement %s:" % (tag)
3346:
3347: def characters(self, data):
3348: global log
3349: log = log + "characters: %s:" % (data)
3350:
3351: def warning(self, msg):
3352: global log
3353: log = log + "warning: %s:" % (msg)
3354:
3355: def error(self, msg):
3356: global log
3357: log = log + "error: %s:" % (msg)
3358:
3359: def fatalError(self, msg):
3360: global log
3361: log = log + "fatalError: %s:" % (msg)
3362:
3363: handler = callback()
3364:
3365: ctxt = libxml2.createPushParser(handler, "<foo", 4, "test.xml")
3366: chunk = " url='tst'>b"
3367: ctxt.parseChunk(chunk, len(chunk), 0)
3368: chunk = "ar</foo>"
3369: ctxt.parseChunk(chunk, len(chunk), 1)
3370:
3371: reference = "startDocument:startElement foo {'url': 'tst'}:" + \
3372: "characters: bar:endElement foo:endDocument:"
3373: if log != reference:
3374: print "Error got: %s" % log
3375: print "Expected: %s" % reference</pre>
3376:
3377: <p>The key object in that test is the handler, it provides a number of entry
3378: points which can be called by the parser as it makes progresses to indicate
3379: the information set obtained. The full set of callback is larger than what
3380: the callback class in that specific example implements (see the SAX
3381: definition for a complete list). The wrapper will only call those supplied by
3382: the object when activated. The startElement receives the names of the element
3383: and a dictionary containing the attributes carried by this element.</p>
3384:
3385: <p>Also note that the reference string generated from the callback shows a
3386: single character call even though the string "bar" is passed to the parser
3387: from 2 different call to parseChunk()</p>
3388:
3389: <h3>xpath.py:</h3>
3390:
3391: <p>This is a basic test of XPath wrappers support</p>
3392: <pre>import libxml2
3393:
3394: doc = libxml2.parseFile("tst.xml")
3395: ctxt = doc.xpathNewContext()
3396: res = ctxt.xpathEval("//*")
3397: if len(res) != 2:
3398: print "xpath query: wrong node set size"
3399: sys.exit(1)
3400: if res[0].name != "doc" or res[1].name != "foo":
3401: print "xpath query: wrong node set value"
3402: sys.exit(1)
3403: doc.freeDoc()
3404: ctxt.xpathFreeContext()</pre>
3405:
3406: <p>This test parses a file, then create an XPath context to evaluate XPath
3407: expression on it. The xpathEval() method execute an XPath query and returns
3408: the result mapped in a Python way. String and numbers are natively converted,
3409: and node sets are returned as a tuple of libxml2 Python nodes wrappers. Like
3410: the document, the XPath context need to be freed explicitly, also not that
3411: the result of the XPath query may point back to the document tree and hence
3412: the document must be freed after the result of the query is used.</p>
3413:
3414: <h3>xpathext.py:</h3>
3415:
3416: <p>This test shows how to extend the XPath engine with functions written in
3417: python:</p>
3418: <pre>import libxml2
3419:
3420: def foo(ctx, x):
3421: return x + 1
3422:
3423: doc = libxml2.parseFile("tst.xml")
3424: ctxt = doc.xpathNewContext()
3425: libxml2.registerXPathFunction(ctxt._o, "foo", None, foo)
3426: res = ctxt.xpathEval("foo(1)")
3427: if res != 2:
3428: print "xpath extension failure"
3429: doc.freeDoc()
3430: ctxt.xpathFreeContext()</pre>
3431:
3432: <p>Note how the extension function is registered with the context (but that
3433: part is not yet finalized, this may change slightly in the future).</p>
3434:
3435: <h3>tstxpath.py:</h3>
3436:
3437: <p>This test is similar to the previous one but shows how the extension
3438: function can access the XPath evaluation context:</p>
3439: <pre>def foo(ctx, x):
3440: global called
3441:
3442: #
3443: # test that access to the XPath evaluation contexts
3444: #
3445: pctxt = libxml2.xpathParserContext(_obj=ctx)
3446: ctxt = pctxt.context()
3447: called = ctxt.function()
3448: return x + 1</pre>
3449:
3450: <p>All the interfaces around the XPath parser(or rather evaluation) context
3451: are not finalized, but it should be sufficient to do contextual work at the
3452: evaluation point.</p>
3453:
3454: <h3>Memory debugging:</h3>
3455:
3456: <p>last but not least, all tests starts with the following prologue:</p>
3457: <pre>#memory debug specific
3458: libxml2.debugMemory(1)</pre>
3459:
3460: <p>and ends with the following epilogue:</p>
3461: <pre>#memory debug specific
3462: libxml2.cleanupParser()
3463: if libxml2.debugMemory(1) == 0:
3464: print "OK"
3465: else:
3466: print "Memory leak %d bytes" % (libxml2.debugMemory(1))
3467: libxml2.dumpMemory()</pre>
3468:
3469: <p>Those activate the memory debugging interface of libxml2 where all
3470: allocated block in the library are tracked. The prologue then cleans up the
3471: library state and checks that all allocated memory has been freed. If not it
3472: calls dumpMemory() which saves that list in a <code>.memdump</code> file.</p>
3473:
3474: <h2><a name="architecture">libxml2 architecture</a></h2>
3475:
3476: <p>Libxml2 is made of multiple components; some of them are optional, and
3477: most of the block interfaces are public. The main components are:</p>
3478: <ul>
3479: <li>an Input/Output layer</li>
3480: <li>FTP and HTTP client layers (optional)</li>
3481: <li>an Internationalization layer managing the encodings support</li>
3482: <li>a URI module</li>
3483: <li>the XML parser and its basic SAX interface</li>
3484: <li>an HTML parser using the same SAX interface (optional)</li>
3485: <li>a SAX tree module to build an in-memory DOM representation</li>
3486: <li>a tree module to manipulate the DOM representation</li>
3487: <li>a validation module using the DOM representation (optional)</li>
3488: <li>an XPath module for global lookup in a DOM representation
3489: (optional)</li>
3490: <li>a debug module (optional)</li>
3491: </ul>
3492:
3493: <p>Graphically this gives the following:</p>
3494:
3495: <p><img src="libxml.gif" alt="a graphical view of the various"></p>
3496:
3497: <p></p>
3498:
3499: <h2><a name="tree">The tree output</a></h2>
3500:
3501: <p>The parser returns a tree built during the document analysis. The value
3502: returned is an <strong>xmlDocPtr</strong> (i.e., a pointer to an
3503: <strong>xmlDoc</strong> structure). This structure contains information such
3504: as the file name, the document type, and a <strong>children</strong> pointer
3505: which is the root of the document (or more exactly the first child under the
3506: root which is the document). The tree is made of <strong>xmlNode</strong>s,
3507: chained in double-linked lists of siblings and with a children<->parent
3508: relationship. An xmlNode can also carry properties (a chain of xmlAttr
3509: structures). An attribute may have a value which is a list of TEXT or
3510: ENTITY_REF nodes.</p>
3511:
3512: <p>Here is an example (erroneous with respect to the XML spec since there
3513: should be only one ELEMENT under the root):</p>
3514:
3515: <p><img src="structure.gif" alt=" structure.gif "></p>
3516:
3517: <p>In the source package there is a small program (not installed by default)
3518: called <strong>xmllint</strong> which parses XML files given as argument and
3519: prints them back as parsed. This is useful for detecting errors both in XML
3520: code and in the XML parser itself. It has an option <strong>--debug</strong>
3521: which prints the actual in-memory structure of the document; here is the
3522: result with the <a href="#example">example</a> given before:</p>
3523: <pre>DOCUMENT
3524: version=1.0
3525: standalone=true
3526: ELEMENT EXAMPLE
3527: ATTRIBUTE prop1
3528: TEXT
3529: content=gnome is great
3530: ATTRIBUTE prop2
3531: ENTITY_REF
3532: TEXT
3533: content= linux too
3534: ELEMENT head
3535: ELEMENT title
3536: TEXT
3537: content=Welcome to Gnome
3538: ELEMENT chapter
3539: ELEMENT title
3540: TEXT
3541: content=The Linux adventure
3542: ELEMENT p
3543: TEXT
3544: content=bla bla bla ...
3545: ELEMENT image
3546: ATTRIBUTE href
3547: TEXT
3548: content=linus.gif
3549: ELEMENT p
3550: TEXT
3551: content=...</pre>
3552:
3553: <p>This should be useful for learning the internal representation model.</p>
3554:
3555: <h2><a name="interface">The SAX interface</a></h2>
3556:
3557: <p>Sometimes the DOM tree output is just too large to fit reasonably into
3558: memory. In that case (and if you don't expect to save back the XML document
3559: loaded using libxml), it's better to use the SAX interface of libxml. SAX is
3560: a <strong>callback-based interface</strong> to the parser. Before parsing,
3561: the application layer registers a customized set of callbacks which are
3562: called by the library as it progresses through the XML input.</p>
3563:
3564: <p>To get more detailed step-by-step guidance on using the SAX interface of
3565: libxml, see the <a
3566: href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
3567: documentation</a>.written by <a href="mailto:james@daa.com.au">James
3568: Henstridge</a>.</p>
3569:
3570: <p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
3571: program located in the gnome-xml module (it's usually not shipped in the
3572: binary packages of libxml, but you can find it in the tar source
3573: distribution). Here is the sequence of callbacks that would be reported by
3574: testSAX when parsing the example XML document shown earlier:</p>
3575: <pre>SAX.setDocumentLocator()
3576: SAX.startDocument()
3577: SAX.getEntity(amp)
3578: SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too')
3579: SAX.characters( , 3)
3580: SAX.startElement(head)
3581: SAX.characters( , 4)
3582: SAX.startElement(title)
3583: SAX.characters(Welcome to Gnome, 16)
3584: SAX.endElement(title)
3585: SAX.characters( , 3)
3586: SAX.endElement(head)
3587: SAX.characters( , 3)
3588: SAX.startElement(chapter)
3589: SAX.characters( , 4)
3590: SAX.startElement(title)
3591: SAX.characters(The Linux adventure, 19)
3592: SAX.endElement(title)
3593: SAX.characters( , 4)
3594: SAX.startElement(p)
3595: SAX.characters(bla bla bla ..., 15)
3596: SAX.endElement(p)
3597: SAX.characters( , 4)
3598: SAX.startElement(image, href='linus.gif')
3599: SAX.endElement(image)
3600: SAX.characters( , 4)
3601: SAX.startElement(p)
3602: SAX.characters(..., 3)
3603: SAX.endElement(p)
3604: SAX.characters( , 3)
3605: SAX.endElement(chapter)
3606: SAX.characters( , 1)
3607: SAX.endElement(EXAMPLE)
3608: SAX.endDocument()</pre>
3609:
3610: <p>Most of the other interfaces of libxml2 are based on the DOM tree-building
3611: facility, so nearly everything up to the end of this document presupposes the
3612: use of the standard DOM tree build. Note that the DOM tree itself is built by
3613: a set of registered default callbacks, without internal specific
3614: interface.</p>
3615:
3616: <h2><a name="Validation">Validation & DTDs</a></h2>
3617:
3618: <p>Table of Content:</p>
3619: <ol>
3620: <li><a href="#General5">General overview</a></li>
3621: <li><a href="#definition">The definition</a></li>
3622: <li><a href="#Simple">Simple rules</a>
3623: <ol>
3624: <li><a href="#reference">How to reference a DTD from a document</a></li>
3625: <li><a href="#Declaring">Declaring elements</a></li>
3626: <li><a href="#Declaring1">Declaring attributes</a></li>
3627: </ol>
3628: </li>
3629: <li><a href="#Some">Some examples</a></li>
3630: <li><a href="#validate">How to validate</a></li>
3631: <li><a href="#Other">Other resources</a></li>
3632: </ol>
3633:
3634: <h3><a name="General5">General overview</a></h3>
3635:
3636: <p>Well what is validation and what is a DTD ?</p>
3637:
3638: <p>DTD is the acronym for Document Type Definition. This is a description of
3639: the content for a family of XML files. This is part of the XML 1.0
3640: specification, and allows one to describe and verify that a given document
3641: instance conforms to the set of rules detailing its structure and content.</p>
3642:
3643: <p>Validation is the process of checking a document against a DTD (more
3644: generally against a set of construction rules).</p>
3645:
3646: <p>The validation process and building DTDs are the two most difficult parts
3647: of the XML life cycle. Briefly a DTD defines all the possible elements to be
3648: found within your document, what is the formal shape of your document tree
3649: (by defining the allowed content of an element; either text, a regular
3650: expression for the allowed list of children, or mixed content i.e. both text
3651: and children). The DTD also defines the valid attributes for all elements and
3652: the types of those attributes.</p>
3653:
3654: <h3><a name="definition1">The definition</a></h3>
3655:
3656: <p>The <a href="http://www.w3.org/TR/REC-xml">W3C XML Recommendation</a> (<a
3657: href="http://www.xml.com/axml/axml.html">Tim Bray's annotated version of
3658: Rev1</a>):</p>
3659: <ul>
3660: <li><a href="http://www.w3.org/TR/REC-xml#elemdecls">Declaring
3661: elements</a></li>
3662: <li><a href="http://www.w3.org/TR/REC-xml#attdecls">Declaring
3663: attributes</a></li>
3664: </ul>
3665:
3666: <p>(unfortunately) all this is inherited from the SGML world, the syntax is
3667: ancient...</p>
3668:
3669: <h3><a name="Simple1">Simple rules</a></h3>
3670:
3671: <p>Writing DTDs can be done in many ways. The rules to build them if you need
3672: something permanent or something which can evolve over time can be radically
3673: different. Really complex DTDs like DocBook ones are flexible but quite
3674: harder to design. I will just focus on DTDs for a formats with a fixed simple
3675: structure. It is just a set of basic rules, and definitely not exhaustive nor
3676: usable for complex DTD design.</p>
3677:
3678: <h4><a name="reference1">How to reference a DTD from a document</a>:</h4>
3679:
3680: <p>Assuming the top element of the document is <code>spec</code> and the dtd
3681: is placed in the file <code>mydtd</code> in the subdirectory
3682: <code>dtds</code> of the directory from where the document were loaded:</p>
3683:
3684: <p><code><!DOCTYPE spec SYSTEM "dtds/mydtd"></code></p>
3685:
3686: <p>Notes:</p>
3687: <ul>
3688: <li>The system string is actually an URI-Reference (as defined in <a
3689: href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>) so you can use a
3690: full URL string indicating the location of your DTD on the Web. This is a
3691: really good thing to do if you want others to validate your document.</li>
3692: <li>It is also possible to associate a <code>PUBLIC</code> identifier (a
3693: magic string) so that the DTD is looked up in catalogs on the client side
3694: without having to locate it on the web.</li>
3695: <li>A DTD contains a set of element and attribute declarations, but they
3696: don't define what the root of the document should be. This is explicitly
3697: told to the parser/validator as the first element of the
3698: <code>DOCTYPE</code> declaration.</li>
3699: </ul>
3700:
3701: <h4><a name="Declaring2">Declaring elements</a>:</h4>
3702:
3703: <p>The following declares an element <code>spec</code>:</p>
3704:
3705: <p><code><!ELEMENT spec (front, body, back?)></code></p>
3706:
3707: <p>It also expresses that the spec element contains one <code>front</code>,
3708: one <code>body</code> and one optional <code>back</code> children elements in
3709: this order. The declaration of one element of the structure and its content
3710: are done in a single declaration. Similarly the following declares
3711: <code>div1</code> elements:</p>
3712:
3713: <p><code><!ELEMENT div1 (head, (p | list | note)*, div2?)></code></p>
3714:
3715: <p>which means div1 contains one <code>head</code> then a series of optional
3716: <code>p</code>, <code>list</code>s and <code>note</code>s and then an
3717: optional <code>div2</code>. And last but not least an element can contain
3718: text:</p>
3719:
3720: <p><code><!ELEMENT b (#PCDATA)></code></p>
3721:
3722: <p><code>b</code> contains text or being of mixed content (text and elements
3723: in no particular order):</p>
3724:
3725: <p><code><!ELEMENT p (#PCDATA|a|ul|b|i|em)*></code></p>
3726:
3727: <p><code>p </code>can contain text or <code>a</code>, <code>ul</code>,
3728: <code>b</code>, <code>i </code>or <code>em</code> elements in no particular
3729: order.</p>
3730:
3731: <h4><a name="Declaring1">Declaring attributes</a>:</h4>
3732:
3733: <p>Again the attributes declaration includes their content definition:</p>
3734:
3735: <p><code><!ATTLIST termdef name CDATA #IMPLIED></code></p>
3736:
3737: <p>means that the element <code>termdef</code> can have a <code>name</code>
3738: attribute containing text (<code>CDATA</code>) and which is optional
3739: (<code>#IMPLIED</code>). The attribute value can also be defined within a
3740: set:</p>
3741:
3742: <p><code><!ATTLIST list type (bullets|ordered|glossary)
3743: "ordered"></code></p>
3744:
3745: <p>means <code>list</code> element have a <code>type</code> attribute with 3
3746: allowed values "bullets", "ordered" or "glossary" and which default to
3747: "ordered" if the attribute is not explicitly specified.</p>
3748:
3749: <p>The content type of an attribute can be text (<code>CDATA</code>),
3750: anchor/reference/references
3751: (<code>ID</code>/<code>IDREF</code>/<code>IDREFS</code>), entity(ies)
3752: (<code>ENTITY</code>/<code>ENTITIES</code>) or name(s)
3753: (<code>NMTOKEN</code>/<code>NMTOKENS</code>). The following defines that a
3754: <code>chapter</code> element can have an optional <code>id</code> attribute
3755: of type <code>ID</code>, usable for reference from attribute of type
3756: IDREF:</p>
3757:
3758: <p><code><!ATTLIST chapter id ID #IMPLIED></code></p>
3759:
3760: <p>The last value of an attribute definition can be <code>#REQUIRED
3761: </code>meaning that the attribute has to be given, <code>#IMPLIED</code>
3762: meaning that it is optional, or the default value (possibly prefixed by
3763: <code>#FIXED</code> if it is the only allowed).</p>
3764:
3765: <p>Notes:</p>
3766: <ul>
3767: <li>Usually the attributes pertaining to a given element are declared in a
3768: single expression, but it is just a convention adopted by a lot of DTD
3769: writers:
3770: <pre><!ATTLIST termdef
3771: id ID #REQUIRED
3772: name CDATA #IMPLIED></pre>
3773: <p>The previous construct defines both <code>id</code> and
3774: <code>name</code> attributes for the element <code>termdef</code>.</p>
3775: </li>
3776: </ul>
3777:
3778: <h3><a name="Some1">Some examples</a></h3>
3779:
3780: <p>The directory <code>test/valid/dtds/</code> in the libxml2 distribution
3781: contains some complex DTD examples. The example in the file
3782: <code>test/valid/dia.xml</code> shows an XML file where the simple DTD is
3783: directly included within the document.</p>
3784:
3785: <h3><a name="validate1">How to validate</a></h3>
3786:
3787: <p>The simplest way is to use the xmllint program included with libxml. The
3788: <code>--valid</code> option turns-on validation of the files given as input.
3789: For example the following validates a copy of the first revision of the XML
3790: 1.0 specification:</p>
3791:
3792: <p><code>xmllint --valid --noout test/valid/REC-xml-19980210.xml</code></p>
3793:
3794: <p>the -- noout is used to disable output of the resulting tree.</p>
3795:
3796: <p>The <code>--dtdvalid dtd</code> allows validation of the document(s)
3797: against a given DTD.</p>
3798:
3799: <p>Libxml2 exports an API to handle DTDs and validation, check the <a
3800: href="http://xmlsoft.org/html/libxml-valid.html">associated
3801: description</a>.</p>
3802:
3803: <h3><a name="Other1">Other resources</a></h3>
3804:
3805: <p>DTDs are as old as SGML. So there may be a number of examples on-line, I
3806: will just list one for now, others pointers welcome:</p>
3807: <ul>
3808: <li><a href="http://www.xml101.com:8081/dtd/">XML-101 DTD</a></li>
3809: </ul>
3810:
3811: <p>I suggest looking at the examples found under test/valid/dtd and any of
3812: the large number of books available on XML. The dia example in test/valid
3813: should be both simple and complete enough to allow you to build your own.</p>
3814:
3815: <p></p>
3816:
3817: <h2><a name="Memory">Memory Management</a></h2>
3818:
3819: <p>Table of Content:</p>
3820: <ol>
3821: <li><a href="#General3">General overview</a></li>
3822: <li><a href="#setting">Setting libxml2 set of memory routines</a></li>
3823: <li><a href="#cleanup">Cleaning up after using the library</a></li>
3824: <li><a href="#Debugging">Debugging routines</a></li>
3825: <li><a href="#General4">General memory requirements</a></li>
3826: <li><a href="#Compacting">Returning memory to the kernel</a></li>
3827: </ol>
3828:
3829: <h3><a name="General3">General overview</a></h3>
3830:
3831: <p>The module <code><a
3832: href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlmemory.h</a></code>
3833: provides the interfaces to the libxml2 memory system:</p>
3834: <ul>
3835: <li>libxml2 does not use the libc memory allocator directly but xmlFree(),
3836: xmlMalloc() and xmlRealloc()</li>
3837: <li>those routines can be reallocated to a specific set of routine, by
3838: default the libc ones i.e. free(), malloc() and realloc()</li>
3839: <li>the xmlmemory.c module includes a set of debugging routine</li>
3840: </ul>
3841:
3842: <h3><a name="setting">Setting libxml2 set of memory routines</a></h3>
3843:
3844: <p>It is sometimes useful to not use the default memory allocator, either for
3845: debugging, analysis or to implement a specific behaviour on memory management
3846: (like on embedded systems). Two function calls are available to do so:</p>
3847: <ul>
3848: <li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemGet
3849: ()</a> which return the current set of functions in use by the parser</li>
3850: <li><a
3851: href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemSetup()</a>
3852: which allow to set up a new set of memory allocation functions</li>
3853: </ul>
3854:
3855: <p>Of course a call to xmlMemSetup() should probably be done before calling
3856: any other libxml2 routines (unless you are sure your allocations routines are
3857: compatibles).</p>
3858:
3859: <h3><a name="cleanup">Cleaning up after using the library</a></h3>
3860:
3861: <p>Libxml2 is not stateless, there is a few set of memory structures needing
3862: allocation before the parser is fully functional (some encoding structures
3863: for example). This also mean that once parsing is finished there is a tiny
3864: amount of memory (a few hundred bytes) which can be recollected if you don't
3865: reuse the library or any document built with it:</p>
3866: <ul>
3867: <li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlCleanupParser
3868: ()</a> is a centralized routine to free the library state and data. Note
3869: that it won't deallocate any produced tree if any (use the xmlFreeDoc()
3870: and related routines for this). This should be called only when the library
3871: is not used anymore.</li>
3872: <li><a href="http://xmlsoft.org/html/libxml-parser.html">xmlInitParser
3873: ()</a> is the dual routine allowing to preallocate the parsing state
3874: which can be useful for example to avoid initialization reentrancy
3875: problems when using libxml2 in multithreaded applications</li>
3876: </ul>
3877:
3878: <p>Generally xmlCleanupParser() is safe assuming no parsing is ongoing and
3879: no document is still being used, if needed the state will be rebuild at the
3880: next invocation of parser routines (or by xmlInitParser()), but be careful
3881: of the consequences in multithreaded applications.</p>
3882:
3883: <h3><a name="Debugging">Debugging routines</a></h3>
3884:
3885: <p>When configured using --with-mem-debug flag (off by default), libxml2 uses
3886: a set of memory allocation debugging routines keeping track of all allocated
3887: blocks and the location in the code where the routine was called. A couple of
3888: other debugging routines allow to dump the memory allocated infos to a file
3889: or call a specific routine when a given block number is allocated:</p>
3890: <ul>
3891: <li><a
3892: href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMallocLoc()</a>
3893: <a
3894: href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlReallocLoc()</a>
3895: and <a
3896: href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemStrdupLoc()</a>
3897: are the memory debugging replacement allocation routines</li>
3898: <li><a href="http://xmlsoft.org/html/libxml-xmlmemory.html">xmlMemoryDump
3899: ()</a> dumps all the information about the allocated memory block lefts
3900: in the <code>.memdump</code> file</li>
3901: </ul>
3902:
3903: <p>When developing libxml2 memory debug is enabled, the tests programs call
3904: xmlMemoryDump () and the "make test" regression tests will check for any
3905: memory leak during the full regression test sequence, this helps a lot
3906: ensuring that libxml2 does not leak memory and bullet proof memory
3907: allocations use (some libc implementations are known to be far too permissive
3908: resulting in major portability problems!).</p>
3909:
3910: <p>If the .memdump reports a leak, it displays the allocation function and
3911: also tries to give some information about the content and structure of the
3912: allocated blocks left. This is sufficient in most cases to find the culprit,
3913: but not always. Assuming the allocation problem is reproducible, it is
3914: possible to find more easily:</p>
3915: <ol>
3916: <li>write down the block number xxxx not allocated</li>
3917: <li>export the environment variable XML_MEM_BREAKPOINT=xxxx , the easiest
3918: when using GDB is to simply give the command
3919: <p><code>set environment XML_MEM_BREAKPOINT xxxx</code></p>
3920: <p>before running the program.</p>
3921: </li>
3922: <li>run the program under a debugger and set a breakpoint on
3923: xmlMallocBreakpoint() a specific function called when this precise block
3924: is allocated</li>
3925: <li>when the breakpoint is reached you can then do a fine analysis of the
3926: allocation an step to see the condition resulting in the missing
3927: deallocation.</li>
3928: </ol>
3929:
3930: <p>I used to use a commercial tool to debug libxml2 memory problems but after
3931: noticing that it was not detecting memory leaks that simple mechanism was
3932: used and proved extremely efficient until now. Lately I have also used <a
3933: href="http://developer.kde.org/~sewardj/">valgrind</a> with quite some
3934: success, it is tied to the i386 architecture since it works by emulating the
3935: processor and instruction set, it is slow but extremely efficient, i.e. it
3936: spot memory usage errors in a very precise way.</p>
3937:
3938: <h3><a name="General4">General memory requirements</a></h3>
3939:
3940: <p>How much libxml2 memory require ? It's hard to tell in average it depends
3941: of a number of things:</p>
3942: <ul>
3943: <li>the parser itself should work in a fixed amount of memory, except for
3944: information maintained about the stacks of names and entities locations.
3945: The I/O and encoding handlers will probably account for a few KBytes.
3946: This is true for both the XML and HTML parser (though the HTML parser
3947: need more state).</li>
3948: <li>If you are generating the DOM tree then memory requirements will grow
3949: nearly linear with the size of the data. In general for a balanced
3950: textual document the internal memory requirement is about 4 times the
3951: size of the UTF8 serialization of this document (example the XML-1.0
3952: recommendation is a bit more of 150KBytes and takes 650KBytes of main
3953: memory when parsed). Validation will add a amount of memory required for
3954: maintaining the external Dtd state which should be linear with the
3955: complexity of the content model defined by the Dtd</li>
3956: <li>If you need to work with fixed memory requirements or don't need the
3957: full DOM tree then using the <a href="xmlreader.html">xmlReader
3958: interface</a> is probably the best way to proceed, it still allows to
3959: validate or operate on subset of the tree if needed.</li>
3960: <li>If you don't care about the advanced features of libxml2 like
3961: validation, DOM, XPath or XPointer, don't use entities, need to work with
3962: fixed memory requirements, and try to get the fastest parsing possible
3963: then the SAX interface should be used, but it has known restrictions.</li>
3964: </ul>
3965:
3966: <p></p>
3967: <h3><a name="Compacting">Returning memory to the kernel</a></h3>
3968:
3969: <p>You may encounter that your process using libxml2 does not have a
3970: reduced memory usage although you freed the trees. This is because
3971: libxml2 allocates memory in a number of small chunks. When freeing one
3972: of those chunks, the OS may decide that giving this little memory back
3973: to the kernel will cause too much overhead and delay the operation. As
3974: all chunks are this small, they get actually freed but not returned to
3975: the kernel. On systems using glibc, there is a function call
3976: "malloc_trim" from malloc.h which does this missing operation (note that
3977: it is allowed to fail). Thus, after freeing your tree you may simply try
3978: "malloc_trim(0);" to really get the memory back. If your OS does not
3979: provide malloc_trim, try searching for a similar function.</p>
3980: <p></p>
3981:
3982: <h2><a name="Encodings">Encodings support</a></h2>
3983:
3984: <p>If you are not really familiar with Internationalization (usual shortcut
3985: is I18N) , Unicode, characters and glyphs, I suggest you read a <a
3986: href="http://www.tbray.org/ongoing/When/200x/2003/04/06/Unicode">presentation</a>
3987: by Tim Bray on Unicode and why you should care about it.</p>
3988:
3989: <p>If you don't understand why <b>it does not make sense to have a string
3990: without knowing what encoding it uses</b>, then as Joel Spolsky said <a
3991: href="http://www.joelonsoftware.com/articles/Unicode.html">please do not
3992: write another line of code until you finish reading that article.</a>. It is
3993: a prerequisite to understand this page, and avoid a lot of problems with
3994: libxml2, XML or text processing in general.</p>
3995:
3996: <p>Table of Content:</p>
3997: <ol>
3998: <li><a href="encoding.html#What">What does internationalization support
3999: mean ?</a></li>
4000: <li><a href="encoding.html#internal">The internal encoding, how and
4001: why</a></li>
4002: <li><a href="encoding.html#implemente">How is it implemented ?</a></li>
4003: <li><a href="encoding.html#Default">Default supported encodings</a></li>
4004: <li><a href="encoding.html#extend">How to extend the existing
4005: support</a></li>
4006: </ol>
4007:
4008: <h3><a name="What">What does internationalization support mean ?</a></h3>
4009:
4010: <p>XML was designed from the start to allow the support of any character set
4011: by using Unicode. Any conformant XML parser has to support the UTF-8 and
4012: UTF-16 default encodings which can both express the full unicode ranges. UTF8
4013: is a variable length encoding whose greatest points are to reuse the same
4014: encoding for ASCII and to save space for Western encodings, but it is a bit
4015: more complex to handle in practice. UTF-16 use 2 bytes per character (and
4016: sometimes combines two pairs), it makes implementation easier, but looks a
4017: bit overkill for Western languages encoding. Moreover the XML specification
4018: allows the document to be encoded in other encodings at the condition that
4019: they are clearly labeled as such. For example the following is a wellformed
4020: XML document encoded in ISO-8859-1 and using accentuated letters that we
4021: French like for both markup and content:</p>
4022: <pre><?xml version="1.0" encoding="ISO-8859-1"?>
4023: <très>là </très></pre>
4024:
4025: <p>Having internationalization support in libxml2 means the following:</p>
4026: <ul>
4027: <li>the document is properly parsed</li>
4028: <li>information about it's encoding is saved</li>
4029: <li>it can be modified</li>
4030: <li>it can be saved in its original encoding</li>
4031: <li>it can also be saved in another encoding supported by libxml2 (for
4032: example straight UTF8 or even an ASCII form)</li>
4033: </ul>
4034:
4035: <p>Another very important point is that the whole libxml2 API, with the
4036: exception of a few routines to read with a specific encoding or save to a
4037: specific encoding, is completely agnostic about the original encoding of the
4038: document.</p>
4039:
4040: <p>It should be noted too that the HTML parser embedded in libxml2 now obey
4041: the same rules too, the following document will be (as of 2.2.2) handled in
4042: an internationalized fashion by libxml2 too:</p>
4043: <pre><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
4044: "http://www.w3.org/TR/REC-html40/loose.dtd">
4045: <html lang="fr">
4046: <head>
4047: <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
4048: </head>
4049: <body>
4050: <p>W3C crée des standards pour le Web.</body>
4051: </html></pre>
4052:
4053: <h3><a name="internal">The internal encoding, how and why</a></h3>
4054:
4055: <p>One of the core decisions was to force all documents to be converted to a
4056: default internal encoding, and that encoding to be UTF-8, here are the
4057: rationales for those choices:</p>
4058: <ul>
4059: <li>keeping the native encoding in the internal form would force the libxml
4060: users (or the code associated) to be fully aware of the encoding of the
4061: original document, for examples when adding a text node to a document,
4062: the content would have to be provided in the document encoding, i.e. the
4063: client code would have to check it before hand, make sure it's conformant
4064: to the encoding, etc ... Very hard in practice, though in some specific
4065: cases this may make sense.</li>
4066: <li>the second decision was which encoding. From the XML spec only UTF8 and
4067: UTF16 really makes sense as being the two only encodings for which there
4068: is mandatory support. UCS-4 (32 bits fixed size encoding) could be
4069: considered an intelligent choice too since it's a direct Unicode mapping
4070: support. I selected UTF-8 on the basis of efficiency and compatibility
4071: with surrounding software:
4072: <ul>
4073: <li>UTF-8 while a bit more complex to convert from/to (i.e. slightly
4074: more costly to import and export CPU wise) is also far more compact
4075: than UTF-16 (and UCS-4) for a majority of the documents I see it used
4076: for right now (RPM RDF catalogs, advogato data, various configuration
4077: file formats, etc.) and the key point for today's computer
4078: architecture is efficient uses of caches. If one nearly double the
4079: memory requirement to store the same amount of data, this will trash
4080: caches (main memory/external caches/internal caches) and my take is
4081: that this harms the system far more than the CPU requirements needed
4082: for the conversion to UTF-8</li>
4083: <li>Most of libxml2 version 1 users were using it with straight ASCII
4084: most of the time, doing the conversion with an internal encoding
4085: requiring all their code to be rewritten was a serious show-stopper
4086: for using UTF-16 or UCS-4.</li>
4087: <li>UTF-8 is being used as the de-facto internal encoding standard for
4088: related code like the <a href="http://www.pango.org/">pango</a>
4089: upcoming Gnome text widget, and a lot of Unix code (yet another place
4090: where Unix programmer base takes a different approach from Microsoft
4091: - they are using UTF-16)</li>
4092: </ul>
4093: </li>
4094: </ul>
4095:
4096: <p>What does this mean in practice for the libxml2 user:</p>
4097: <ul>
4098: <li>xmlChar, the libxml2 data type is a byte, those bytes must be assembled
4099: as UTF-8 valid strings. The proper way to terminate an xmlChar * string
4100: is simply to append 0 byte, as usual.</li>
4101: <li>One just need to make sure that when using chars outside the ASCII set,
4102: the values has been properly converted to UTF-8</li>
4103: </ul>
4104:
4105: <h3><a name="implemente">How is it implemented ?</a></h3>
4106:
4107: <p>Let's describe how all this works within libxml, basically the I18N
4108: (internationalization) support get triggered only during I/O operation, i.e.
4109: when reading a document or saving one. Let's look first at the reading
4110: sequence:</p>
4111: <ol>
4112: <li>when a document is processed, we usually don't know the encoding, a
4113: simple heuristic allows to detect UTF-16 and UCS-4 from encodings where
4114: the ASCII range (0-0x7F) maps with ASCII</li>
4115: <li>the xml declaration if available is parsed, including the encoding
4116: declaration. At that point, if the autodetected encoding is different
4117: from the one declared a call to xmlSwitchEncoding() is issued.</li>
4118: <li>If there is no encoding declaration, then the input has to be in either
4119: UTF-8 or UTF-16, if it is not then at some point when processing the
4120: input, the converter/checker of UTF-8 form will raise an encoding error.
4121: You may end-up with a garbled document, or no document at all ! Example:
4122: <pre>~/XML -> ./xmllint err.xml
4123: err.xml:1: error: Input is not proper UTF-8, indicate encoding !
4124: <très>là </très>
4125: ^
4126: err.xml:1: error: Bytes: 0xE8 0x73 0x3E 0x6C
4127: <très>là </très>
4128: ^</pre>
4129: </li>
4130: <li>xmlSwitchEncoding() does an encoding name lookup, canonicalize it, and
4131: then search the default registered encoding converters for that encoding.
4132: If it's not within the default set and iconv() support has been compiled
4133: it, it will ask iconv for such an encoder. If this fails then the parser
4134: will report an error and stops processing:
4135: <pre>~/XML -> ./xmllint err2.xml
4136: err2.xml:1: error: Unsupported encoding UnsupportedEnc
4137: <?xml version="1.0" encoding="UnsupportedEnc"?>
4138: ^</pre>
4139: </li>
4140: <li>From that point the encoder processes progressively the input (it is
4141: plugged as a front-end to the I/O module) for that entity. It captures
4142: and converts on-the-fly the document to be parsed to UTF-8. The parser
4143: itself just does UTF-8 checking of this input and process it
4144: transparently. The only difference is that the encoding information has
4145: been added to the parsing context (more precisely to the input
4146: corresponding to this entity).</li>
4147: <li>The result (when using DOM) is an internal form completely in UTF-8
4148: with just an encoding information on the document node.</li>
4149: </ol>
4150:
4151: <p>Ok then what happens when saving the document (assuming you
4152: collected/built an xmlDoc DOM like structure) ? It depends on the function
4153: called, xmlSaveFile() will just try to save in the original encoding, while
4154: xmlSaveFileTo() and xmlSaveFileEnc() can optionally save to a given
4155: encoding:</p>
4156: <ol>
4157: <li>if no encoding is given, libxml2 will look for an encoding value
4158: associated to the document and if it exists will try to save to that
4159: encoding,
4160: <p>otherwise everything is written in the internal form, i.e. UTF-8</p>
4161: </li>
4162: <li>so if an encoding was specified, either at the API level or on the
4163: document, libxml2 will again canonicalize the encoding name, lookup for a
4164: converter in the registered set or through iconv. If not found the
4165: function will return an error code</li>
4166: <li>the converter is placed before the I/O buffer layer, as another kind of
4167: buffer, then libxml2 will simply push the UTF-8 serialization to through
4168: that buffer, which will then progressively be converted and pushed onto
4169: the I/O layer.</li>
4170: <li>It is possible that the converter code fails on some input, for example
4171: trying to push an UTF-8 encoded Chinese character through the UTF-8 to
4172: ISO-8859-1 converter won't work. Since the encoders are progressive they
4173: will just report the error and the number of bytes converted, at that
4174: point libxml2 will decode the offending character, remove it from the
4175: buffer and replace it with the associated charRef encoding &#123; and
4176: resume the conversion. This guarantees that any document will be saved
4177: without losses (except for markup names where this is not legal, this is
4178: a problem in the current version, in practice avoid using non-ascii
4179: characters for tag or attribute names). A special "ascii" encoding name
4180: is used to save documents to a pure ascii form can be used when
4181: portability is really crucial</li>
4182: </ol>
4183:
4184: <p>Here are a few examples based on the same test document and assumin a
4185: terminal using ISO-8859-1 as the text encoding:</p>
4186: <pre>~/XML -> ./xmllint isolat1
4187: <?xml version="1.0" encoding="ISO-8859-1"?>
4188: <très>là</très>
4189: ~/XML -> ./xmllint --encode UTF-8 isolat1
4190: <?xml version="1.0" encoding="UTF-8"?>
4191: <très>là </très>
4192: ~/XML -> </pre>
4193:
4194: <p>The same processing is applied (and reuse most of the code) for HTML I18N
4195: processing. Looking up and modifying the content encoding is a bit more
4196: difficult since it is located in a <meta> tag under the <head>,
4197: so a couple of functions htmlGetMetaEncoding() and htmlSetMetaEncoding() have
4198: been provided. The parser also attempts to switch encoding on the fly when
4199: detecting such a tag on input. Except for that the processing is the same
4200: (and again reuses the same code).</p>
4201:
4202: <h3><a name="Default">Default supported encodings</a></h3>
4203:
4204: <p>libxml2 has a set of default converters for the following encodings
4205: (located in encoding.c):</p>
4206: <ol>
4207: <li>UTF-8 is supported by default (null handlers)</li>
4208: <li>UTF-16, both little and big endian</li>
4209: <li>ISO-Latin-1 (ISO-8859-1) covering most western languages</li>
4210: <li>ASCII, useful mostly for saving</li>
4211: <li>HTML, a specific handler for the conversion of UTF-8 to ASCII with HTML
4212: predefined entities like &copy; for the Copyright sign.</li>
4213: </ol>
4214:
4215: <p>More over when compiled on an Unix platform with iconv support the full
4216: set of encodings supported by iconv can be instantly be used by libxml. On a
4217: linux machine with glibc-2.1 the list of supported encodings and aliases fill
4218: 3 full pages, and include UCS-4, the full set of ISO-Latin encodings, and the
4219: various Japanese ones.</p>
4220:
4221: <p>To convert from the UTF-8 values returned from the API to another encoding
4222: then it is possible to use the function provided from <a
4223: href="html/libxml-encoding.html">the encoding module</a> like <a
4224: href="html/libxml-encoding.html#UTF8Toisolat1">UTF8Toisolat1</a>, or use the
4225: POSIX <a
4226: href="http://www.opengroup.org/onlinepubs/009695399/functions/iconv.html">iconv()</a>
4227: API directly.</p>
4228:
4229: <h4>Encoding aliases</h4>
4230:
4231: <p>From 2.2.3, libxml2 has support to register encoding names aliases. The
4232: goal is to be able to parse document whose encoding is supported but where
4233: the name differs (for example from the default set of names accepted by
4234: iconv). The following functions allow to register and handle new aliases for
4235: existing encodings. Once registered libxml2 will automatically lookup the
4236: aliases when handling a document:</p>
4237: <ul>
4238: <li>int xmlAddEncodingAlias(const char *name, const char *alias);</li>
4239: <li>int xmlDelEncodingAlias(const char *alias);</li>
4240: <li>const char * xmlGetEncodingAlias(const char *alias);</li>
4241: <li>void xmlCleanupEncodingAliases(void);</li>
4242: </ul>
4243:
4244: <h3><a name="extend">How to extend the existing support</a></h3>
4245:
4246: <p>Well adding support for new encoding, or overriding one of the encoders
4247: (assuming it is buggy) should not be hard, just write input and output
4248: conversion routines to/from UTF-8, and register them using
4249: xmlNewCharEncodingHandler(name, xxxToUTF8, UTF8Toxxx), and they will be
4250: called automatically if the parser(s) encounter such an encoding name
4251: (register it uppercase, this will help). The description of the encoders,
4252: their arguments and expected return values are described in the encoding.h
4253: header.</p>
4254:
4255: <h2><a name="IO">I/O Interfaces</a></h2>
4256:
4257: <p>Table of Content:</p>
4258: <ol>
4259: <li><a href="#General1">General overview</a></li>
4260: <li><a href="#basic">The basic buffer type</a></li>
4261: <li><a href="#Input">Input I/O handlers</a></li>
4262: <li><a href="#Output">Output I/O handlers</a></li>
4263: <li><a href="#entities">The entities loader</a></li>
4264: <li><a href="#Example2">Example of customized I/O</a></li>
4265: </ol>
4266:
4267: <h3><a name="General1">General overview</a></h3>
4268:
4269: <p>The module <code><a
4270: href="http://xmlsoft.org/html/libxml-xmlio.html">xmlIO.h</a></code> provides
4271: the interfaces to the libxml2 I/O system. This consists of 4 main parts:</p>
4272: <ul>
4273: <li>Entities loader, this is a routine which tries to fetch the entities
4274: (files) based on their PUBLIC and SYSTEM identifiers. The default loader
4275: don't look at the public identifier since libxml2 do not maintain a
4276: catalog. You can redefine you own entity loader by using
4277: <code>xmlGetExternalEntityLoader()</code> and
4278: <code>xmlSetExternalEntityLoader()</code>. <a href="#entities">Check the
4279: example</a>.</li>
4280: <li>Input I/O buffers which are a commodity structure used by the parser(s)
4281: input layer to handle fetching the information to feed the parser. This
4282: provides buffering and is also a placeholder where the encoding
4283: converters to UTF8 are piggy-backed.</li>
4284: <li>Output I/O buffers are similar to the Input ones and fulfill similar
4285: task but when generating a serialization from a tree.</li>
4286: <li>A mechanism to register sets of I/O callbacks and associate them with
4287: specific naming schemes like the protocol part of the URIs.
4288: <p>This affect the default I/O operations and allows to use specific I/O
4289: handlers for certain names.</p>
4290: </li>
4291: </ul>
4292:
4293: <p>The general mechanism used when loading http://rpmfind.net/xml.html for
4294: example in the HTML parser is the following:</p>
4295: <ol>
4296: <li>The default entity loader calls <code>xmlNewInputFromFile()</code> with
4297: the parsing context and the URI string.</li>
4298: <li>the URI string is checked against the existing registered handlers
4299: using their match() callback function, if the HTTP module was compiled
4300: in, it is registered and its match() function will succeeds</li>
4301: <li>the open() function of the handler is called and if successful will
4302: return an I/O Input buffer</li>
4303: <li>the parser will the start reading from this buffer and progressively
4304: fetch information from the resource, calling the read() function of the
4305: handler until the resource is exhausted</li>
4306: <li>if an encoding change is detected it will be installed on the input
4307: buffer, providing buffering and efficient use of the conversion
4308: routines</li>
4309: <li>once the parser has finished, the close() function of the handler is
4310: called once and the Input buffer and associated resources are
4311: deallocated.</li>
4312: </ol>
4313:
4314: <p>The user defined callbacks are checked first to allow overriding of the
4315: default libxml2 I/O routines.</p>
4316:
4317: <h3><a name="basic">The basic buffer type</a></h3>
4318:
4319: <p>All the buffer manipulation handling is done using the
4320: <code>xmlBuffer</code> type define in <code><a
4321: href="http://xmlsoft.org/html/libxml-tree.html">tree.h</a> </code>which is a
4322: resizable memory buffer. The buffer allocation strategy can be selected to be
4323: either best-fit or use an exponential doubling one (CPU vs. memory use
4324: trade-off). The values are <code>XML_BUFFER_ALLOC_EXACT</code> and
4325: <code>XML_BUFFER_ALLOC_DOUBLEIT</code>, and can be set individually or on a
4326: system wide basis using <code>xmlBufferSetAllocationScheme()</code>. A number
4327: of functions allows to manipulate buffers with names starting with the
4328: <code>xmlBuffer...</code> prefix.</p>
4329:
4330: <h3><a name="Input">Input I/O handlers</a></h3>
4331:
4332: <p>An Input I/O handler is a simple structure
4333: <code>xmlParserInputBuffer</code> containing a context associated to the
4334: resource (file descriptor, or pointer to a protocol handler), the read() and
4335: close() callbacks to use and an xmlBuffer. And extra xmlBuffer and a charset
4336: encoding handler are also present to support charset conversion when
4337: needed.</p>
4338:
4339: <h3><a name="Output">Output I/O handlers</a></h3>
4340:
4341: <p>An Output handler <code>xmlOutputBuffer</code> is completely similar to an
4342: Input one except the callbacks are write() and close().</p>
4343:
4344: <h3><a name="entities">The entities loader</a></h3>
4345:
4346: <p>The entity loader resolves requests for new entities and create inputs for
4347: the parser. Creating an input from a filename or an URI string is done
4348: through the xmlNewInputFromFile() routine. The default entity loader do not
4349: handle the PUBLIC identifier associated with an entity (if any). So it just
4350: calls xmlNewInputFromFile() with the SYSTEM identifier (which is mandatory in
4351: XML).</p>
4352:
4353: <p>If you want to hook up a catalog mechanism then you simply need to
4354: override the default entity loader, here is an example:</p>
4355: <pre>#include <libxml/xmlIO.h>
4356:
4357: xmlExternalEntityLoader defaultLoader = NULL;
4358:
4359: xmlParserInputPtr
4360: xmlMyExternalEntityLoader(const char *URL, const char *ID,
4361: xmlParserCtxtPtr ctxt) {
4362: xmlParserInputPtr ret;
4363: const char *fileID = NULL;
4364: /* lookup for the fileID depending on ID */
4365:
4366: ret = xmlNewInputFromFile(ctxt, fileID);
4367: if (ret != NULL)
4368: return(ret);
4369: if (defaultLoader != NULL)
4370: ret = defaultLoader(URL, ID, ctxt);
4371: return(ret);
4372: }
4373:
4374: int main(..) {
4375: ...
4376:
4377: /*
4378: * Install our own entity loader
4379: */
4380: defaultLoader = xmlGetExternalEntityLoader();
4381: xmlSetExternalEntityLoader(xmlMyExternalEntityLoader);
4382:
4383: ...
4384: }</pre>
4385:
4386: <h3><a name="Example2">Example of customized I/O</a></h3>
4387:
4388: <p>This example come from <a href="http://xmlsoft.org/messages/0708.html">a
4389: real use case</a>, xmlDocDump() closes the FILE * passed by the application
4390: and this was a problem. The <a
4391: href="http://xmlsoft.org/messages/0711.html">solution</a> was to redefine a
4392: new output handler with the closing call deactivated:</p>
4393: <ol>
4394: <li>First define a new I/O output allocator where the output don't close
4395: the file:
4396: <pre>xmlOutputBufferPtr
4397: xmlOutputBufferCreateOwn(FILE *file, xmlCharEncodingHandlerPtr encoder) {
4398: xmlOutputBufferPtr ret;
4399:
4400: if (xmlOutputCallbackInitialized == 0)
4401: xmlRegisterDefaultOutputCallbacks();
4402:
4403: if (file == NULL) return(NULL);
4404: ret = xmlAllocOutputBuffer(encoder);
4405: if (ret != NULL) {
4406: ret->context = file;
4407: ret->writecallback = xmlFileWrite;
4408: ret->closecallback = NULL; /* No close callback */
4409: }
4410: return(ret);
4411: } </pre>
4412: </li>
4413: <li>And then use it to save the document:
4414: <pre>FILE *f;
4415: xmlOutputBufferPtr output;
4416: xmlDocPtr doc;
4417: int res;
4418:
4419: f = ...
4420: doc = ....
4421:
4422: output = xmlOutputBufferCreateOwn(f, NULL);
4423: res = xmlSaveFileTo(output, doc, NULL);
4424: </pre>
4425: </li>
4426: </ol>
4427:
4428: <h2><a name="Catalog">Catalog support</a></h2>
4429:
4430: <p>Table of Content:</p>
4431: <ol>
4432: <li><a href="General2">General overview</a></li>
4433: <li><a href="#definition">The definition</a></li>
4434: <li><a href="#Simple">Using catalogs</a></li>
4435: <li><a href="#Some">Some examples</a></li>
4436: <li><a href="#reference">How to tune catalog usage</a></li>
4437: <li><a href="#validate">How to debug catalog processing</a></li>
4438: <li><a href="#Declaring">How to create and maintain catalogs</a></li>
4439: <li><a href="#implemento">The implementor corner quick review of the
4440: API</a></li>
4441: <li><a href="#Other">Other resources</a></li>
4442: </ol>
4443:
4444: <h3><a name="General2">General overview</a></h3>
4445:
4446: <p>What is a catalog? Basically it's a lookup mechanism used when an entity
4447: (a file or a remote resource) references another entity. The catalog lookup
4448: is inserted between the moment the reference is recognized by the software
4449: (XML parser, stylesheet processing, or even images referenced for inclusion
4450: in a rendering) and the time where loading that resource is actually
4451: started.</p>
4452:
4453: <p>It is basically used for 3 things:</p>
4454: <ul>
4455: <li>mapping from "logical" names, the public identifiers and a more
4456: concrete name usable for download (and URI). For example it can associate
4457: the logical name
4458: <p>"-//OASIS//DTD DocBook XML V4.1.2//EN"</p>
4459: <p>of the DocBook 4.1.2 XML DTD with the actual URL where it can be
4460: downloaded</p>
4461: <p>http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd</p>
4462: </li>
4463: <li>remapping from a given URL to another one, like an HTTP indirection
4464: saying that
4465: <p>"http://www.oasis-open.org/committes/tr.xsl"</p>
4466: <p>should really be looked at</p>
4467: <p>"http://www.oasis-open.org/committes/entity/stylesheets/base/tr.xsl"</p>
4468: </li>
4469: <li>providing a local cache mechanism allowing to load the entities
4470: associated to public identifiers or remote resources, this is a really
4471: important feature for any significant deployment of XML or SGML since it
4472: allows to avoid the aleas and delays associated to fetching remote
4473: resources.</li>
4474: </ul>
4475:
4476: <h3><a name="definition">The definitions</a></h3>
4477:
4478: <p>Libxml, as of 2.4.3 implements 2 kind of catalogs:</p>
4479: <ul>
4480: <li>the older SGML catalogs, the official spec is SGML Open Technical
4481: Resolution TR9401:1997, but is better understood by reading <a
4482: href="http://www.jclark.com/sp/catalog.htm">the SP Catalog page</a> from
4483: James Clark. This is relatively old and not the preferred mode of
4484: operation of libxml.</li>
4485: <li><a href="http://www.oasis-open.org/committees/entity/spec.html">XML
4486: Catalogs</a> is far more flexible, more recent, uses an XML syntax and
4487: should scale quite better. This is the default option of libxml.</li>
4488: </ul>
4489:
4490: <p></p>
4491:
4492: <h3><a name="Simple">Using catalog</a></h3>
4493:
4494: <p>In a normal environment libxml2 will by default check the presence of a
4495: catalog in /etc/xml/catalog, and assuming it has been correctly populated,
4496: the processing is completely transparent to the document user. To take a
4497: concrete example, suppose you are authoring a DocBook document, this one
4498: starts with the following DOCTYPE definition:</p>
4499: <pre><?xml version='1.0'?>
4500: <!DOCTYPE book PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.4//EN"
4501: "http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd"></pre>
4502:
4503: <p>When validating the document with libxml, the catalog will be
4504: automatically consulted to lookup the public identifier "-//Norman Walsh//DTD
4505: DocBk XML V3.1.4//EN" and the system identifier
4506: "http://nwalsh.com/docbook/xml/3.1.4/db3xml.dtd", and if these entities have
4507: been installed on your system and the catalogs actually point to them, libxml
4508: will fetch them from the local disk.</p>
4509:
4510: <p style="font-size: 10pt"><strong>Note</strong>: Really don't use this
4511: DOCTYPE example it's a really old version, but is fine as an example.</p>
4512:
4513: <p>Libxml2 will check the catalog each time that it is requested to load an
4514: entity, this includes DTD, external parsed entities, stylesheets, etc ... If
4515: your system is correctly configured all the authoring phase and processing
4516: should use only local files, even if your document stays portable because it
4517: uses the canonical public and system ID, referencing the remote document.</p>
4518:
4519: <h3><a name="Some">Some examples:</a></h3>
4520:
4521: <p>Here is a couple of fragments from XML Catalogs used in libxml2 early
4522: regression tests in <code>test/catalogs</code> :</p>
4523: <pre><?xml version="1.0"?>
4524: <!DOCTYPE catalog PUBLIC
4525: "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
4526: "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
4527: <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
4528: <public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
4529: uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
4530: ...</pre>
4531:
4532: <p>This is the beginning of a catalog for DocBook 4.1.2, XML Catalogs are
4533: written in XML, there is a specific namespace for catalog elements
4534: "urn:oasis:names:tc:entity:xmlns:xml:catalog". The first entry in this
4535: catalog is a <code>public</code> mapping it allows to associate a Public
4536: Identifier with an URI.</p>
4537: <pre>...
4538: <rewriteSystem systemIdStartString="http://www.oasis-open.org/docbook/"
4539: rewritePrefix="file:///usr/share/xml/docbook/"/>
4540: ...</pre>
4541:
4542: <p>A <code>rewriteSystem</code> is a very powerful instruction, it says that
4543: any URI starting with a given prefix should be looked at another URI
4544: constructed by replacing the prefix with an new one. In effect this acts like
4545: a cache system for a full area of the Web. In practice it is extremely useful
4546: with a file prefix if you have installed a copy of those resources on your
4547: local system.</p>
4548: <pre>...
4549: <delegatePublic publicIdStartString="-//OASIS//DTD XML Catalog //"
4550: catalog="file:///usr/share/xml/docbook.xml"/>
4551: <delegatePublic publicIdStartString="-//OASIS//ENTITIES DocBook XML"
4552: catalog="file:///usr/share/xml/docbook.xml"/>
4553: <delegatePublic publicIdStartString="-//OASIS//DTD DocBook XML"
4554: catalog="file:///usr/share/xml/docbook.xml"/>
4555: <delegateSystem systemIdStartString="http://www.oasis-open.org/docbook/"
4556: catalog="file:///usr/share/xml/docbook.xml"/>
4557: <delegateURI uriStartString="http://www.oasis-open.org/docbook/"
4558: catalog="file:///usr/share/xml/docbook.xml"/>
4559: ...</pre>
4560:
4561: <p>Delegation is the core features which allows to build a tree of catalogs,
4562: easier to maintain than a single catalog, based on Public Identifier, System
4563: Identifier or URI prefixes it instructs the catalog software to look up
4564: entries in another resource. This feature allow to build hierarchies of
4565: catalogs, the set of entries presented should be sufficient to redirect the
4566: resolution of all DocBook references to the specific catalog in
4567: <code>/usr/share/xml/docbook.xml</code> this one in turn could delegate all
4568: references for DocBook 4.2.1 to a specific catalog installed at the same time
4569: as the DocBook resources on the local machine.</p>
4570:
4571: <h3><a name="reference">How to tune catalog usage:</a></h3>
4572:
4573: <p>The user can change the default catalog behaviour by redirecting queries
4574: to its own set of catalogs, this can be done by setting the
4575: <code>XML_CATALOG_FILES</code> environment variable to a list of catalogs, an
4576: empty one should deactivate loading the default <code>/etc/xml/catalog</code>
4577: default catalog</p>
4578:
4579: <h3><a name="validate">How to debug catalog processing:</a></h3>
4580:
4581: <p>Setting up the <code>XML_DEBUG_CATALOG</code> environment variable will
4582: make libxml2 output debugging information for each catalog operations, for
4583: example:</p>
4584: <pre>orchis:~/XML -> xmllint --memory --noout test/ent2
4585: warning: failed to load external entity "title.xml"
4586: orchis:~/XML -> export XML_DEBUG_CATALOG=
4587: orchis:~/XML -> xmllint --memory --noout test/ent2
4588: Failed to parse catalog /etc/xml/catalog
4589: Failed to parse catalog /etc/xml/catalog
4590: warning: failed to load external entity "title.xml"
4591: Catalogs cleanup
4592: orchis:~/XML -> </pre>
4593:
4594: <p>The test/ent2 references an entity, running the parser from memory makes
4595: the base URI unavailable and the the "title.xml" entity cannot be loaded.
4596: Setting up the debug environment variable allows to detect that an attempt is
4597: made to load the <code>/etc/xml/catalog</code> but since it's not present the
4598: resolution fails.</p>
4599:
4600: <p>But the most advanced way to debug XML catalog processing is to use the
4601: <strong>xmlcatalog</strong> command shipped with libxml2, it allows to load
4602: catalogs and make resolution queries to see what is going on. This is also
4603: used for the regression tests:</p>
4604: <pre>orchis:~/XML -> ./xmlcatalog test/catalogs/docbook.xml \
4605: "-//OASIS//DTD DocBook XML V4.1.2//EN"
4606: http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
4607: orchis:~/XML -> </pre>
4608:
4609: <p>For debugging what is going on, adding one -v flags increase the verbosity
4610: level to indicate the processing done (adding a second flag also indicate
4611: what elements are recognized at parsing):</p>
4612: <pre>orchis:~/XML -> ./xmlcatalog -v test/catalogs/docbook.xml \
4613: "-//OASIS//DTD DocBook XML V4.1.2//EN"
4614: Parsing catalog test/catalogs/docbook.xml's content
4615: Found public match -//OASIS//DTD DocBook XML V4.1.2//EN
4616: http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
4617: Catalogs cleanup
4618: orchis:~/XML -> </pre>
4619:
4620: <p>A shell interface is also available to debug and process multiple queries
4621: (and for regression tests):</p>
4622: <pre>orchis:~/XML -> ./xmlcatalog -shell test/catalogs/docbook.xml \
4623: "-//OASIS//DTD DocBook XML V4.1.2//EN"
4624: > help
4625: Commands available:
4626: public PublicID: make a PUBLIC identifier lookup
4627: system SystemID: make a SYSTEM identifier lookup
4628: resolve PublicID SystemID: do a full resolver lookup
4629: add 'type' 'orig' 'replace' : add an entry
4630: del 'values' : remove values
4631: dump: print the current catalog state
4632: debug: increase the verbosity level
4633: quiet: decrease the verbosity level
4634: exit: quit the shell
4635: > public "-//OASIS//DTD DocBook XML V4.1.2//EN"
4636: http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd
4637: > quit
4638: orchis:~/XML -> </pre>
4639:
4640: <p>This should be sufficient for most debugging purpose, this was actually
4641: used heavily to debug the XML Catalog implementation itself.</p>
4642:
4643: <h3><a name="Declaring">How to create and maintain</a> catalogs:</h3>
4644:
4645: <p>Basically XML Catalogs are XML files, you can either use XML tools to
4646: manage them or use <strong>xmlcatalog</strong> for this. The basic step is
4647: to create a catalog the -create option provide this facility:</p>
4648: <pre>orchis:~/XML -> ./xmlcatalog --create tst.xml
4649: <?xml version="1.0"?>
4650: <!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
4651: "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
4652: <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
4653: orchis:~/XML -> </pre>
4654:
4655: <p>By default xmlcatalog does not overwrite the original catalog and save the
4656: result on the standard output, this can be overridden using the -noout
4657: option. The <code>-add</code> command allows to add entries in the
4658: catalog:</p>
4659: <pre>orchis:~/XML -> ./xmlcatalog --noout --create --add "public" \
4660: "-//OASIS//DTD DocBook XML V4.1.2//EN" \
4661: http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd tst.xml
4662: orchis:~/XML -> cat tst.xml
4663: <?xml version="1.0"?>
4664: <!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" \
4665: "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
4666: <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
4667: <public publicId="-//OASIS//DTD DocBook XML V4.1.2//EN"
4668: uri="http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"/>
4669: </catalog>
4670: orchis:~/XML -> </pre>
4671:
4672: <p>The <code>-add</code> option will always take 3 parameters even if some of
4673: the XML Catalog constructs (like nextCatalog) will have only a single
4674: argument, just pass a third empty string, it will be ignored.</p>
4675:
4676: <p>Similarly the <code>-del</code> option remove matching entries from the
4677: catalog:</p>
4678: <pre>orchis:~/XML -> ./xmlcatalog --del \
4679: "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" tst.xml
4680: <?xml version="1.0"?>
4681: <!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"
4682: "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
4683: <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"/>
4684: orchis:~/XML -> </pre>
4685:
4686: <p>The catalog is now empty. Note that the matching of <code>-del</code> is
4687: exact and would have worked in a similar fashion with the Public ID
4688: string.</p>
4689:
4690: <p>This is rudimentary but should be sufficient to manage a not too complex
4691: catalog tree of resources.</p>
4692:
4693: <h3><a name="implemento">The implementor corner quick review of the
4694: API:</a></h3>
4695:
4696: <p>First, and like for every other module of libxml, there is an
4697: automatically generated <a href="html/libxml-catalog.html">API page for
4698: catalog support</a>.</p>
4699:
4700: <p>The header for the catalog interfaces should be included as:</p>
4701: <pre>#include <libxml/catalog.h></pre>
4702:
4703: <p>The API is voluntarily kept very simple. First it is not obvious that
4704: applications really need access to it since it is the default behaviour of
4705: libxml2 (Note: it is possible to completely override libxml2 default catalog
4706: by using <a href="html/libxml-parser.html">xmlSetExternalEntityLoader</a> to
4707: plug an application specific resolver).</p>
4708:
4709: <p>Basically libxml2 support 2 catalog lists:</p>
4710: <ul>
4711: <li>the default one, global shared by all the application</li>
4712: <li>a per-document catalog, this one is built if the document uses the
4713: <code>oasis-xml-catalog</code> PIs to specify its own catalog list, it is
4714: associated to the parser context and destroyed when the parsing context
4715: is destroyed.</li>
4716: </ul>
4717:
4718: <p>the document one will be used first if it exists.</p>
4719:
4720: <h4>Initialization routines:</h4>
4721:
4722: <p>xmlInitializeCatalog(), xmlLoadCatalog() and xmlLoadCatalogs() should be
4723: used at startup to initialize the catalog, if the catalog should be
4724: initialized with specific values xmlLoadCatalog() or xmlLoadCatalogs()
4725: should be called before xmlInitializeCatalog() which would otherwise do a
4726: default initialization first.</p>
4727:
4728: <p>The xmlCatalogAddLocal() call is used by the parser to grow the document
4729: own catalog list if needed.</p>
4730:
4731: <h4>Preferences setup:</h4>
4732:
4733: <p>The XML Catalog spec requires the possibility to select default
4734: preferences between public and system delegation,
4735: xmlCatalogSetDefaultPrefer() allows this, xmlCatalogSetDefaults() and
4736: xmlCatalogGetDefaults() allow to control if XML Catalogs resolution should
4737: be forbidden, allowed for global catalog, for document catalog or both, the
4738: default is to allow both.</p>
4739:
4740: <p>And of course xmlCatalogSetDebug() allows to generate debug messages
4741: (through the xmlGenericError() mechanism).</p>
4742:
4743: <h4>Querying routines:</h4>
4744:
4745: <p>xmlCatalogResolve(), xmlCatalogResolveSystem(), xmlCatalogResolvePublic()
4746: and xmlCatalogResolveURI() are relatively explicit if you read the XML
4747: Catalog specification they correspond to section 7 algorithms, they should
4748: also work if you have loaded an SGML catalog with a simplified semantic.</p>
4749:
4750: <p>xmlCatalogLocalResolve() and xmlCatalogLocalResolveURI() are the same but
4751: operate on the document catalog list</p>
4752:
4753: <h4>Cleanup and Miscellaneous:</h4>
4754:
4755: <p>xmlCatalogCleanup() free-up the global catalog, xmlCatalogFreeLocal() is
4756: the per-document equivalent.</p>
4757:
4758: <p>xmlCatalogAdd() and xmlCatalogRemove() are used to dynamically modify the
4759: first catalog in the global list, and xmlCatalogDump() allows to dump a
4760: catalog state, those routines are primarily designed for xmlcatalog, I'm not
4761: sure that exposing more complex interfaces (like navigation ones) would be
4762: really useful.</p>
4763:
4764: <p>The xmlParseCatalogFile() is a function used to load XML Catalog files,
4765: it's similar as xmlParseFile() except it bypass all catalog lookups, it's
4766: provided because this functionality may be useful for client tools.</p>
4767:
4768: <h4>threaded environments:</h4>
4769:
4770: <p>Since the catalog tree is built progressively, some care has been taken to
4771: try to avoid troubles in multithreaded environments. The code is now thread
4772: safe assuming that the libxml2 library has been compiled with threads
4773: support.</p>
4774:
4775: <p></p>
4776:
4777: <h3><a name="Other">Other resources</a></h3>
4778:
4779: <p>The XML Catalog specification is relatively recent so there isn't much
4780: literature to point at:</p>
4781: <ul>
4782: <li>You can find a good rant from Norm Walsh about <a
4783: href="http://www.arbortext.com/Think_Tank/XML_Resources/Issue_Three/issue_three.html">the
4784: need for catalogs</a>, it provides a lot of context information even if
4785: I don't agree with everything presented. Norm also wrote a more recent
4786: article <a
4787: href="http://wwws.sun.com/software/xml/developers/resolver/article/">XML
4788: entities and URI resolvers</a> describing them.</li>
4789: <li>An <a href="http://home.ccil.org/~cowan/XML/XCatalog.html">old XML
4790: catalog proposal</a> from John Cowan</li>
4791: <li>The <a href="http://www.rddl.org/">Resource Directory Description
4792: Language</a> (RDDL) another catalog system but more oriented toward
4793: providing metadata for XML namespaces.</li>
4794: <li>the page from the OASIS Technical <a
4795: href="http://www.oasis-open.org/committees/entity/">Committee on Entity
4796: Resolution</a> who maintains XML Catalog, you will find pointers to the
4797: specification update, some background and pointers to others tools
4798: providing XML Catalog support</li>
4799: <li>There is a <a href="buildDocBookCatalog">shell script</a> to generate
4800: XML Catalogs for DocBook 4.1.2 . If it can write to the /etc/xml/
4801: directory, it will set-up /etc/xml/catalog and /etc/xml/docbook based on
4802: the resources found on the system. Otherwise it will just create
4803: ~/xmlcatalog and ~/dbkxmlcatalog and doing:
4804: <p><code>export XML_CATALOG_FILES=$HOME/xmlcatalog</code></p>
4805: <p>should allow to process DocBook documentations without requiring
4806: network accesses for the DTD or stylesheets</p>
4807: </li>
4808: <li>I have uploaded <a href="ftp://xmlsoft.org/libxml2/test/dbk412catalog.tar.gz">a
4809: small tarball</a> containing XML Catalogs for DocBook 4.1.2 which seems
4810: to work fine for me too</li>
4811: <li>The <a href="http://www.xmlsoft.org/xmlcatalog_man.html">xmlcatalog
4812: manual page</a></li>
4813: </ul>
4814:
4815: <p>If you have suggestions for corrections or additions, simply contact
4816: me:</p>
4817:
4818: <h2><a name="library">The parser interfaces</a></h2>
4819:
4820: <p>This section is directly intended to help programmers getting bootstrapped
4821: using the XML tollkit from the C language. It is not intended to be
4822: extensive. I hope the automatically generated documents will provide the
4823: completeness required, but as a separate set of documents. The interfaces of
4824: the XML parser are by principle low level, Those interested in a higher level
4825: API should <a href="#DOM">look at DOM</a>.</p>
4826:
4827: <p>The <a href="html/libxml-parser.html">parser interfaces for XML</a> are
4828: separated from the <a href="html/libxml-htmlparser.html">HTML parser
4829: interfaces</a>. Let's have a look at how the XML parser can be called:</p>
4830:
4831: <h3><a name="Invoking">Invoking the parser : the pull method</a></h3>
4832:
4833: <p>Usually, the first thing to do is to read an XML input. The parser accepts
4834: documents either from in-memory strings or from files. The functions are
4835: defined in "parser.h":</p>
4836: <dl>
4837: <dt><code>xmlDocPtr xmlParseMemory(char *buffer, int size);</code></dt>
4838: <dd><p>Parse a null-terminated string containing the document.</p>
4839: </dd>
4840: </dl>
4841: <dl>
4842: <dt><code>xmlDocPtr xmlParseFile(const char *filename);</code></dt>
4843: <dd><p>Parse an XML document contained in a (possibly compressed)
4844: file.</p>
4845: </dd>
4846: </dl>
4847:
4848: <p>The parser returns a pointer to the document structure (or NULL in case of
4849: failure).</p>
4850:
4851: <h3 id="Invoking1">Invoking the parser: the push method</h3>
4852:
4853: <p>In order for the application to keep the control when the document is
4854: being fetched (which is common for GUI based programs) libxml2 provides a
4855: push interface, too, as of version 1.8.3. Here are the interface
4856: functions:</p>
4857: <pre>xmlParserCtxtPtr xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax,
4858: void *user_data,
4859: const char *chunk,
4860: int size,
4861: const char *filename);
4862: int xmlParseChunk (xmlParserCtxtPtr ctxt,
4863: const char *chunk,
4864: int size,
4865: int terminate);</pre>
4866:
4867: <p>and here is a simple example showing how to use the interface:</p>
4868: <pre> FILE *f;
4869:
4870: f = fopen(filename, "r");
4871: if (f != NULL) {
4872: int res, size = 1024;
4873: char chars[1024];
4874: xmlParserCtxtPtr ctxt;
4875:
4876: res = fread(chars, 1, 4, f);
4877: if (res > 0) {
4878: ctxt = xmlCreatePushParserCtxt(NULL, NULL,
4879: chars, res, filename);
4880: while ((res = fread(chars, 1, size, f)) > 0) {
4881: xmlParseChunk(ctxt, chars, res, 0);
4882: }
4883: xmlParseChunk(ctxt, chars, 0, 1);
4884: doc = ctxt->myDoc;
4885: xmlFreeParserCtxt(ctxt);
4886: }
4887: }</pre>
4888:
4889: <p>The HTML parser embedded into libxml2 also has a push interface; the
4890: functions are just prefixed by "html" rather than "xml".</p>
4891:
4892: <h3 id="Invoking2">Invoking the parser: the SAX interface</h3>
4893:
4894: <p>The tree-building interface makes the parser memory-hungry, first loading
4895: the document in memory and then building the tree itself. Reading a document
4896: without building the tree is possible using the SAX interfaces (see SAX.h and
4897: <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">James
4898: Henstridge's documentation</a>). Note also that the push interface can be
4899: limited to SAX: just use the two first arguments of
4900: <code>xmlCreatePushParserCtxt()</code>.</p>
4901:
4902: <h3><a name="Building">Building a tree from scratch</a></h3>
4903:
4904: <p>The other way to get an XML tree in memory is by building it. Basically
4905: there is a set of functions dedicated to building new elements. (These are
4906: also described in <libxml/tree.h>.) For example, here is a piece of
4907: code that produces the XML document used in the previous examples:</p>
4908: <pre> #include <libxml/tree.h>
4909: xmlDocPtr doc;
4910: xmlNodePtr tree, subtree;
4911:
4912: doc = xmlNewDoc("1.0");
4913: doc->children = xmlNewDocNode(doc, NULL, "EXAMPLE", NULL);
4914: xmlSetProp(doc->children, "prop1", "gnome is great");
4915: xmlSetProp(doc->children, "prop2", "& linux too");
4916: tree = xmlNewChild(doc->children, NULL, "head", NULL);
4917: subtree = xmlNewChild(tree, NULL, "title", "Welcome to Gnome");
4918: tree = xmlNewChild(doc->children, NULL, "chapter", NULL);
4919: subtree = xmlNewChild(tree, NULL, "title", "The Linux adventure");
4920: subtree = xmlNewChild(tree, NULL, "p", "bla bla bla ...");
4921: subtree = xmlNewChild(tree, NULL, "image", NULL);
4922: xmlSetProp(subtree, "href", "linus.gif");</pre>
4923:
4924: <p>Not really rocket science ...</p>
4925:
4926: <h3><a name="Traversing">Traversing the tree</a></h3>
4927:
4928: <p>Basically by <a href="html/libxml-tree.html">including "tree.h"</a> your
4929: code has access to the internal structure of all the elements of the tree.
4930: The names should be somewhat simple like <strong>parent</strong>,
4931: <strong>children</strong>, <strong>next</strong>, <strong>prev</strong>,
4932: <strong>properties</strong>, etc... For example, still with the previous
4933: example:</p>
4934: <pre><code>doc->children->children->children</code></pre>
4935:
4936: <p>points to the title element,</p>
4937: <pre>doc->children->children->next->children->children</pre>
4938:
4939: <p>points to the text node containing the chapter title "The Linux
4940: adventure".</p>
4941:
4942: <p><strong>NOTE</strong>: XML allows <em>PI</em>s and <em>comments</em> to be
4943: present before the document root, so <code>doc->children</code> may point
4944: to an element which is not the document Root Element; a function
4945: <code>xmlDocGetRootElement()</code> was added for this purpose.</p>
4946:
4947: <h3><a name="Modifying">Modifying the tree</a></h3>
4948:
4949: <p>Functions are provided for reading and writing the document content. Here
4950: is an excerpt from the <a href="html/libxml-tree.html">tree API</a>:</p>
4951: <dl>
4952: <dt><code>xmlAttrPtr xmlSetProp(xmlNodePtr node, const xmlChar *name, const
4953: xmlChar *value);</code></dt>
4954: <dd><p>This sets (or changes) an attribute carried by an ELEMENT node.
4955: The value can be NULL.</p>
4956: </dd>
4957: </dl>
4958: <dl>
4959: <dt><code>const xmlChar *xmlGetProp(xmlNodePtr node, const xmlChar
4960: *name);</code></dt>
4961: <dd><p>This function returns a pointer to new copy of the property
4962: content. Note that the user must deallocate the result.</p>
4963: </dd>
4964: </dl>
4965:
4966: <p>Two functions are provided for reading and writing the text associated
4967: with elements:</p>
4968: <dl>
4969: <dt><code>xmlNodePtr xmlStringGetNodeList(xmlDocPtr doc, const xmlChar
4970: *value);</code></dt>
4971: <dd><p>This function takes an "external" string and converts it to one
4972: text node or possibly to a list of entity and text nodes. All
4973: non-predefined entity references like &Gnome; will be stored
4974: internally as entity nodes, hence the result of the function may not be
4975: a single node.</p>
4976: </dd>
4977: </dl>
4978: <dl>
4979: <dt><code>xmlChar *xmlNodeListGetString(xmlDocPtr doc, xmlNodePtr list, int
4980: inLine);</code></dt>
4981: <dd><p>This function is the inverse of
4982: <code>xmlStringGetNodeList()</code>. It generates a new string
4983: containing the content of the text and entity nodes. Note the extra
4984: argument inLine. If this argument is set to 1, the function will expand
4985: entity references. For example, instead of returning the &Gnome;
4986: XML encoding in the string, it will substitute it with its value (say,
4987: "GNU Network Object Model Environment").</p>
4988: </dd>
4989: </dl>
4990:
4991: <h3><a name="Saving">Saving a tree</a></h3>
4992:
4993: <p>Basically 3 options are possible:</p>
4994: <dl>
4995: <dt><code>void xmlDocDumpMemory(xmlDocPtr cur, xmlChar**mem, int
4996: *size);</code></dt>
4997: <dd><p>Returns a buffer into which the document has been saved.</p>
4998: </dd>
4999: </dl>
5000: <dl>
5001: <dt><code>extern void xmlDocDump(FILE *f, xmlDocPtr doc);</code></dt>
5002: <dd><p>Dumps a document to an open file descriptor.</p>
5003: </dd>
5004: </dl>
5005: <dl>
5006: <dt><code>int xmlSaveFile(const char *filename, xmlDocPtr cur);</code></dt>
5007: <dd><p>Saves the document to a file. In this case, the compression
5008: interface is triggered if it has been turned on.</p>
5009: </dd>
5010: </dl>
5011:
5012: <h3><a name="Compressio">Compression</a></h3>
5013:
5014: <p>The library transparently handles compression when doing file-based
5015: accesses. The level of compression on saves can be turned on either globally
5016: or individually for one file:</p>
5017: <dl>
5018: <dt><code>int xmlGetDocCompressMode (xmlDocPtr doc);</code></dt>
5019: <dd><p>Gets the document compression ratio (0-9).</p>
5020: </dd>
5021: </dl>
5022: <dl>
5023: <dt><code>void xmlSetDocCompressMode (xmlDocPtr doc, int mode);</code></dt>
5024: <dd><p>Sets the document compression ratio.</p>
5025: </dd>
5026: </dl>
5027: <dl>
5028: <dt><code>int xmlGetCompressMode(void);</code></dt>
5029: <dd><p>Gets the default compression ratio.</p>
5030: </dd>
5031: </dl>
5032: <dl>
5033: <dt><code>void xmlSetCompressMode(int mode);</code></dt>
5034: <dd><p>Sets the default compression ratio.</p>
5035: </dd>
5036: </dl>
5037:
5038: <h2><a name="Entities">Entities or no entities</a></h2>
5039:
5040: <p>Entities in principle are similar to simple C macros. An entity defines an
5041: abbreviation for a given string that you can reuse many times throughout the
5042: content of your document. Entities are especially useful when a given string
5043: may occur frequently within a document, or to confine the change needed to a
5044: document to a restricted area in the internal subset of the document (at the
5045: beginning). Example:</p>
5046: <pre>1 <?xml version="1.0"?>
5047: 2 <!DOCTYPE EXAMPLE SYSTEM "example.dtd" [
5048: 3 <!ENTITY xml "Extensible Markup Language">
5049: 4 ]>
5050: 5 <EXAMPLE>
5051: 6 &xml;
5052: 7 </EXAMPLE></pre>
5053:
5054: <p>Line 3 declares the xml entity. Line 6 uses the xml entity, by prefixing
5055: its name with '&' and following it by ';' without any spaces added. There
5056: are 5 predefined entities in libxml2 allowing you to escape characters with
5057: predefined meaning in some parts of the xml document content:
5058: <strong>&lt;</strong> for the character '<', <strong>&gt;</strong>
5059: for the character '>', <strong>&apos;</strong> for the character ''',
5060: <strong>&quot;</strong> for the character '"', and
5061: <strong>&amp;</strong> for the character '&'.</p>
5062:
5063: <p>One of the problems related to entities is that you may want the parser to
5064: substitute an entity's content so that you can see the replacement text in
5065: your application. Or you may prefer to keep entity references as such in the
5066: content to be able to save the document back without losing this usually
5067: precious information (if the user went through the pain of explicitly
5068: defining entities, he may have a a rather negative attitude if you blindly
5069: substitute them as saving time). The <a
5070: href="html/libxml-parser.html#xmlSubstituteEntitiesDefault">xmlSubstituteEntitiesDefault()</a>
5071: function allows you to check and change the behaviour, which is to not
5072: substitute entities by default.</p>
5073:
5074: <p>Here is the DOM tree built by libxml2 for the previous document in the
5075: default case:</p>
5076: <pre>/gnome/src/gnome-xml -> ./xmllint --debug test/ent1
5077: DOCUMENT
5078: version=1.0
5079: ELEMENT EXAMPLE
5080: TEXT
5081: content=
5082: ENTITY_REF
5083: INTERNAL_GENERAL_ENTITY xml
5084: content=Extensible Markup Language
5085: TEXT
5086: content=</pre>
5087:
5088: <p>And here is the result when substituting entities:</p>
5089: <pre>/gnome/src/gnome-xml -> ./tester --debug --noent test/ent1
5090: DOCUMENT
5091: version=1.0
5092: ELEMENT EXAMPLE
5093: TEXT
5094: content= Extensible Markup Language</pre>
5095:
5096: <p>So, entities or no entities? Basically, it depends on your use case. I
5097: suggest that you keep the non-substituting default behaviour and avoid using
5098: entities in your XML document or data if you are not willing to handle the
5099: entity references elements in the DOM tree.</p>
5100:
5101: <p>Note that at save time libxml2 enforces the conversion of the predefined
5102: entities where necessary to prevent well-formedness problems, and will also
5103: transparently replace those with chars (i.e. it will not generate entity
5104: reference elements in the DOM tree or call the reference() SAX callback when
5105: finding them in the input).</p>
5106:
5107: <p><span style="background-color: #FF0000">WARNING</span>: handling entities
5108: on top of the libxml2 SAX interface is difficult!!! If you plan to use
5109: non-predefined entities in your documents, then the learning curve to handle
5110: then using the SAX API may be long. If you plan to use complex documents, I
5111: strongly suggest you consider using the DOM interface instead and let libxml
5112: deal with the complexity rather than trying to do it yourself.</p>
5113:
5114: <h2><a name="Namespaces">Namespaces</a></h2>
5115:
5116: <p>The libxml2 library implements <a
5117: href="http://www.w3.org/TR/REC-xml-names/">XML namespaces</a> support by
5118: recognizing namespace constructs in the input, and does namespace lookup
5119: automatically when building the DOM tree. A namespace declaration is
5120: associated with an in-memory structure and all elements or attributes within
5121: that namespace point to it. Hence testing the namespace is a simple and fast
5122: equality operation at the user level.</p>
5123:
5124: <p>I suggest that people using libxml2 use a namespace, and declare it in the
5125: root element of their document as the default namespace. Then they don't need
5126: to use the prefix in the content but we will have a basis for future semantic
5127: refinement and merging of data from different sources. This doesn't increase
5128: the size of the XML output significantly, but significantly increases its
5129: value in the long-term. Example:</p>
5130: <pre><mydoc xmlns="http://mydoc.example.org/schemas/">
5131: <elem1>...</elem1>
5132: <elem2>...</elem2>
5133: </mydoc></pre>
5134:
5135: <p>The namespace value has to be an absolute URL, but the URL doesn't have to
5136: point to any existing resource on the Web. It will bind all the element and
5137: attributes with that URL. I suggest to use an URL within a domain you
5138: control, and that the URL should contain some kind of version information if
5139: possible. For example, <code>"http://www.gnome.org/gnumeric/1.0/"</code> is a
5140: good namespace scheme.</p>
5141:
5142: <p>Then when you load a file, make sure that a namespace carrying the
5143: version-independent prefix is installed on the root element of your document,
5144: and if the version information don't match something you know, warn the user
5145: and be liberal in what you accept as the input. Also do *not* try to base
5146: namespace checking on the prefix value. <foo:text> may be exactly the
5147: same as <bar:text> in another document. What really matters is the URI
5148: associated with the element or the attribute, not the prefix string (which is
5149: just a shortcut for the full URI). In libxml, element and attributes have an
5150: <code>ns</code> field pointing to an xmlNs structure detailing the namespace
5151: prefix and its URI.</p>
5152:
5153: <p>@@Interfaces@@</p>
5154: <pre>xmlNodePtr node;
5155: if(!strncmp(node->name,"mytag",5)
5156: && node->ns
5157: && !strcmp(node->ns->href,"http://www.mysite.com/myns/1.0")) {
5158: ...
5159: }</pre>
5160:
5161: <p>Usually people object to using namespaces together with validity checking.
5162: I will try to make sure that using namespaces won't break validity checking,
5163: so even if you plan to use or currently are using validation I strongly
5164: suggest adding namespaces to your document. A default namespace scheme
5165: <code>xmlns="http://...."</code> should not break validity even on less
5166: flexible parsers. Using namespaces to mix and differentiate content coming
5167: from multiple DTDs will certainly break current validation schemes. To check
5168: such documents one needs to use schema-validation, which is supported in
5169: libxml2 as well. See <a href="http://www.relaxng.org/">relagx-ng</a> and <a
5170: href="http://www.w3c.org/XML/Schema">w3c-schema</a>.</p>
5171:
5172: <h2><a name="Upgrading">Upgrading 1.x code</a></h2>
5173:
5174: <p>Incompatible changes:</p>
5175:
5176: <p>Version 2 of libxml2 is the first version introducing serious backward
5177: incompatible changes. The main goals were:</p>
5178: <ul>
5179: <li>a general cleanup. A number of mistakes inherited from the very early
5180: versions couldn't be changed due to compatibility constraints. Example
5181: the "childs" element in the nodes.</li>
5182: <li>Uniformization of the various nodes, at least for their header and link
5183: parts (doc, parent, children, prev, next), the goal is a simpler
5184: programming model and simplifying the task of the DOM implementors.</li>
5185: <li>better conformances to the XML specification, for example version 1.x
5186: had an heuristic to try to detect ignorable white spaces. As a result the
5187: SAX event generated were ignorableWhitespace() while the spec requires
5188: character() in that case. This also mean that a number of DOM node
5189: containing blank text may populate the DOM tree which were not present
5190: before.</li>
5191: </ul>
5192:
5193: <h3>How to fix libxml-1.x code:</h3>
5194:
5195: <p>So client code of libxml designed to run with version 1.x may have to be
5196: changed to compile against version 2.x of libxml. Here is a list of changes
5197: that I have collected, they may not be sufficient, so in case you find other
5198: change which are required, <a href="mailto:Daniel.Veillard@w3.org">drop me a
5199: mail</a>:</p>
5200: <ol>
5201: <li>The package name have changed from libxml to libxml2, the library name
5202: is now -lxml2 . There is a new xml2-config script which should be used to
5203: select the right parameters libxml2</li>
5204: <li>Node <strong>childs</strong> field has been renamed
5205: <strong>children</strong> so s/childs/children/g should be applied
5206: (probability of having "childs" anywhere else is close to 0+</li>
5207: <li>The document don't have anymore a <strong>root</strong> element it has
5208: been replaced by <strong>children</strong> and usually you will get a
5209: list of element here. For example a Dtd element for the internal subset
5210: and it's declaration may be found in that list, as well as processing
5211: instructions or comments found before or after the document root element.
5212: Use <strong>xmlDocGetRootElement(doc)</strong> to get the root element of
5213: a document. Alternatively if you are sure to not reference DTDs nor have
5214: PIs or comments before or after the root element
5215: s/->root/->children/g will probably do it.</li>
5216: <li>The white space issue, this one is more complex, unless special case of
5217: validating parsing, the line breaks and spaces usually used for indenting
5218: and formatting the document content becomes significant. So they are
5219: reported by SAX and if your using the DOM tree, corresponding nodes are
5220: generated. Too approach can be taken:
5221: <ol>
5222: <li>lazy one, use the compatibility call
5223: <strong>xmlKeepBlanksDefault(0)</strong> but be aware that you are
5224: relying on a special (and possibly broken) set of heuristics of
5225: libxml to detect ignorable blanks. Don't complain if it breaks or
5226: make your application not 100% clean w.r.t. to it's input.</li>
5227: <li>the Right Way: change you code to accept possibly insignificant
5228: blanks characters, or have your tree populated with weird blank text
5229: nodes. You can spot them using the commodity function
5230: <strong>xmlIsBlankNode(node)</strong> returning 1 for such blank
5231: nodes.</li>
5232: </ol>
5233: <p>Note also that with the new default the output functions don't add any
5234: extra indentation when saving a tree in order to be able to round trip
5235: (read and save) without inflating the document with extra formatting
5236: chars.</p>
5237: </li>
5238: <li>The include path has changed to $prefix/libxml/ and the includes
5239: themselves uses this new prefix in includes instructions... If you are
5240: using (as expected) the
5241: <pre>xml2-config --cflags</pre>
5242: <p>output to generate you compile commands this will probably work out of
5243: the box</p>
5244: </li>
5245: <li>xmlDetectCharEncoding takes an extra argument indicating the length in
5246: byte of the head of the document available for character detection.</li>
5247: </ol>
5248:
5249: <h3>Ensuring both libxml-1.x and libxml-2.x compatibility</h3>
5250:
5251: <p>Two new version of libxml (1.8.11) and libxml2 (2.3.4) have been released
5252: to allow smooth upgrade of existing libxml v1code while retaining
5253: compatibility. They offers the following:</p>
5254: <ol>
5255: <li>similar include naming, one should use
5256: <strong>#include<libxml/...></strong> in both cases.</li>
5257: <li>similar identifiers defined via macros for the child and root fields:
5258: respectively <strong>xmlChildrenNode</strong> and
5259: <strong>xmlRootNode</strong></li>
5260: <li>a new macro <strong>LIBXML_TEST_VERSION</strong> which should be
5261: inserted once in the client code</li>
5262: </ol>
5263:
5264: <p>So the roadmap to upgrade your existing libxml applications is the
5265: following:</p>
5266: <ol>
5267: <li>install the libxml-1.8.8 (and libxml-devel-1.8.8) packages</li>
5268: <li>find all occurrences where the xmlDoc <strong>root</strong> field is
5269: used and change it to <strong>xmlRootNode</strong></li>
5270: <li>similarly find all occurrences where the xmlNode
5271: <strong>childs</strong> field is used and change it to
5272: <strong>xmlChildrenNode</strong></li>
5273: <li>add a <strong>LIBXML_TEST_VERSION</strong> macro somewhere in your
5274: <strong>main()</strong> or in the library init entry point</li>
5275: <li>Recompile, check compatibility, it should still work</li>
5276: <li>Change your configure script to look first for xml2-config and fall
5277: back using xml-config . Use the --cflags and --libs output of the command
5278: as the Include and Linking parameters needed to use libxml.</li>
5279: <li>install libxml2-2.3.x and libxml2-devel-2.3.x (libxml-1.8.y and
5280: libxml-devel-1.8.y can be kept simultaneously)</li>
5281: <li>remove your config.cache, relaunch your configuration mechanism, and
5282: recompile, if steps 2 and 3 were done right it should compile as-is</li>
5283: <li>Test that your application is still running correctly, if not this may
5284: be due to extra empty nodes due to formating spaces being kept in libxml2
5285: contrary to libxml1, in that case insert xmlKeepBlanksDefault(1) in your
5286: code before calling the parser (next to
5287: <strong>LIBXML_TEST_VERSION</strong> is a fine place).</li>
5288: </ol>
5289:
5290: <p>Following those steps should work. It worked for some of my own code.</p>
5291:
5292: <p>Let me put some emphasis on the fact that there is far more changes from
5293: libxml 1.x to 2.x than the ones you may have to patch for. The overall code
5294: has been considerably cleaned up and the conformance to the XML specification
5295: has been drastically improved too. Don't take those changes as an excuse to
5296: not upgrade, it may cost a lot on the long term ...</p>
5297:
5298: <h2><a name="Thread">Thread safety</a></h2>
5299:
5300: <p>Starting with 2.4.7, libxml2 makes provisions to ensure that concurrent
5301: threads can safely work in parallel parsing different documents. There is
5302: however a couple of things to do to ensure it:</p>
5303: <ul>
5304: <li>configure the library accordingly using the --with-threads options</li>
5305: <li>call xmlInitParser() in the "main" thread before using any of the
5306: libxml2 API (except possibly selecting a different memory allocator)</li>
5307: </ul>
5308:
5309: <p>Note that the thread safety cannot be ensured for multiple threads sharing
5310: the same document, the locking must be done at the application level, libxml
5311: exports a basic mutex and reentrant mutexes API in <libxml/threads.h>.
5312: The parts of the library checked for thread safety are:</p>
5313: <ul>
5314: <li>concurrent loading</li>
5315: <li>file access resolution</li>
5316: <li>catalog access</li>
5317: <li>catalog building</li>
5318: <li>entities lookup/accesses</li>
5319: <li>validation</li>
5320: <li>global variables per-thread override</li>
5321: <li>memory handling</li>
5322: </ul>
5323:
1.1.1.2 ! misho 5324: <p>XPath has been tested for threaded usage on non-modified document
! 5325: for example when using libxslt, but make 100% sure the documents
! 5326: are accessed read-only !</p>
1.1 misho 5327:
5328: <h2><a name="DOM"></a><a name="Principles">DOM Principles</a></h2>
5329:
5330: <p><a href="http://www.w3.org/DOM/">DOM</a> stands for the <em>Document
5331: Object Model</em>; this is an API for accessing XML or HTML structured
5332: documents. Native support for DOM in Gnome is on the way (module gnome-dom),
5333: and will be based on gnome-xml. This will be a far cleaner interface to
5334: manipulate XML files within Gnome since it won't expose the internal
5335: structure.</p>
5336:
5337: <p>The current DOM implementation on top of libxml2 is the <a
5338: href="http://svn.gnome.org/viewvc/gdome2/trunk/">gdome2 Gnome module</a>, this
5339: is a full DOM interface, thanks to Paolo Casarini, check the <a
5340: href="http://gdome2.cs.unibo.it/">Gdome2 homepage</a> for more
5341: information.</p>
5342:
5343: <h2><a name="Example"></a><a name="real">A real example</a></h2>
5344:
5345: <p>Here is a real size example, where the actual content of the application
5346: data is not kept in the DOM tree but uses internal structures. It is based on
5347: a proposal to keep a database of jobs related to Gnome, with an XML based
5348: storage structure. Here is an <a href="gjobs.xml">XML encoded jobs
5349: base</a>:</p>
5350: <pre><?xml version="1.0"?>
5351: <gjob:Helping xmlns:gjob="http://www.gnome.org/some-location">
5352: <gjob:Jobs>
5353:
5354: <gjob:Job>
5355: <gjob:Project ID="3"/>
5356: <gjob:Application>GBackup</gjob:Application>
5357: <gjob:Category>Development</gjob:Category>
5358:
5359: <gjob:Update>
5360: <gjob:Status>Open</gjob:Status>
5361: <gjob:Modified>Mon, 07 Jun 1999 20:27:45 -0400 MET DST</gjob:Modified>
5362: <gjob:Salary>USD 0.00</gjob:Salary>
5363: </gjob:Update>
5364:
5365: <gjob:Developers>
5366: <gjob:Developer>
5367: </gjob:Developer>
5368: </gjob:Developers>
5369:
5370: <gjob:Contact>
5371: <gjob:Person>Nathan Clemons</gjob:Person>
5372: <gjob:Email>nathan@windsofstorm.net</gjob:Email>
5373: <gjob:Company>
5374: </gjob:Company>
5375: <gjob:Organisation>
5376: </gjob:Organisation>
5377: <gjob:Webpage>
5378: </gjob:Webpage>
5379: <gjob:Snailmail>
5380: </gjob:Snailmail>
5381: <gjob:Phone>
5382: </gjob:Phone>
5383: </gjob:Contact>
5384:
5385: <gjob:Requirements>
5386: The program should be released as free software, under the GPL.
5387: </gjob:Requirements>
5388:
5389: <gjob:Skills>
5390: </gjob:Skills>
5391:
5392: <gjob:Details>
5393: A GNOME based system that will allow a superuser to configure
5394: compressed and uncompressed files and/or file systems to be backed
5395: up with a supported media in the system. This should be able to
5396: perform via find commands generating a list of files that are passed
5397: to tar, dd, cpio, cp, gzip, etc., to be directed to the tape machine
5398: or via operations performed on the filesystem itself. Email
5399: notification and GUI status display very important.
5400: </gjob:Details>
5401:
5402: </gjob:Job>
5403:
5404: </gjob:Jobs>
5405: </gjob:Helping></pre>
5406:
5407: <p>While loading the XML file into an internal DOM tree is a matter of
5408: calling only a couple of functions, browsing the tree to gather the data and
5409: generate the internal structures is harder, and more error prone.</p>
5410:
5411: <p>The suggested principle is to be tolerant with respect to the input
5412: structure. For example, the ordering of the attributes is not significant,
5413: the XML specification is clear about it. It's also usually a good idea not to
5414: depend on the order of the children of a given node, unless it really makes
5415: things harder. Here is some code to parse the information for a person:</p>
5416: <pre>/*
5417: * A person record
5418: */
5419: typedef struct person {
5420: char *name;
5421: char *email;
5422: char *company;
5423: char *organisation;
5424: char *smail;
5425: char *webPage;
5426: char *phone;
5427: } person, *personPtr;
5428:
5429: /*
5430: * And the code needed to parse it
5431: */
5432: personPtr parsePerson(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
5433: personPtr ret = NULL;
5434:
5435: DEBUG("parsePerson\n");
5436: /*
5437: * allocate the struct
5438: */
5439: ret = (personPtr) malloc(sizeof(person));
5440: if (ret == NULL) {
5441: fprintf(stderr,"out of memory\n");
5442: return(NULL);
5443: }
5444: memset(ret, 0, sizeof(person));
5445:
5446: /* We don't care what the top level element name is */
5447: cur = cur->xmlChildrenNode;
5448: while (cur != NULL) {
5449: if ((!strcmp(cur->name, "Person")) && (cur->ns == ns))
5450: ret->name = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
5451: if ((!strcmp(cur->name, "Email")) && (cur->ns == ns))
5452: ret->email = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
5453: cur = cur->next;
5454: }
5455:
5456: return(ret);
5457: }</pre>
5458:
5459: <p>Here are a couple of things to notice:</p>
5460: <ul>
5461: <li>Usually a recursive parsing style is the more convenient one: XML data
5462: is by nature subject to repetitive constructs and usually exhibits highly
5463: structured patterns.</li>
5464: <li>The two arguments of type <em>xmlDocPtr</em> and <em>xmlNsPtr</em>,
5465: i.e. the pointer to the global XML document and the namespace reserved to
5466: the application. Document wide information are needed for example to
5467: decode entities and it's a good coding practice to define a namespace for
5468: your application set of data and test that the element and attributes
5469: you're analyzing actually pertains to your application space. This is
5470: done by a simple equality test (cur->ns == ns).</li>
5471: <li>To retrieve text and attributes value, you can use the function
5472: <em>xmlNodeListGetString</em> to gather all the text and entity reference
5473: nodes generated by the DOM output and produce an single text string.</li>
5474: </ul>
5475:
5476: <p>Here is another piece of code used to parse another level of the
5477: structure:</p>
5478: <pre>#include <libxml/tree.h>
5479: /*
5480: * a Description for a Job
5481: */
5482: typedef struct job {
5483: char *projectID;
5484: char *application;
5485: char *category;
5486: personPtr contact;
5487: int nbDevelopers;
5488: personPtr developers[100]; /* using dynamic alloc is left as an exercise */
5489: } job, *jobPtr;
5490:
5491: /*
5492: * And the code needed to parse it
5493: */
5494: jobPtr parseJob(xmlDocPtr doc, xmlNsPtr ns, xmlNodePtr cur) {
5495: jobPtr ret = NULL;
5496:
5497: DEBUG("parseJob\n");
5498: /*
5499: * allocate the struct
5500: */
5501: ret = (jobPtr) malloc(sizeof(job));
5502: if (ret == NULL) {
5503: fprintf(stderr,"out of memory\n");
5504: return(NULL);
5505: }
5506: memset(ret, 0, sizeof(job));
5507:
5508: /* We don't care what the top level element name is */
5509: cur = cur->xmlChildrenNode;
5510: while (cur != NULL) {
5511:
5512: if ((!strcmp(cur->name, "Project")) && (cur->ns == ns)) {
5513: ret->projectID = xmlGetProp(cur, "ID");
5514: if (ret->projectID == NULL) {
5515: fprintf(stderr, "Project has no ID\n");
5516: }
5517: }
5518: if ((!strcmp(cur->name, "Application")) && (cur->ns == ns))
5519: ret->application = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
5520: if ((!strcmp(cur->name, "Category")) && (cur->ns == ns))
5521: ret->category = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
5522: if ((!strcmp(cur->name, "Contact")) && (cur->ns == ns))
5523: ret->contact = parsePerson(doc, ns, cur);
5524: cur = cur->next;
5525: }
5526:
5527: return(ret);
5528: }</pre>
5529:
5530: <p>Once you are used to it, writing this kind of code is quite simple, but
5531: boring. Ultimately, it could be possible to write stubbers taking either C
5532: data structure definitions, a set of XML examples or an XML DTD and produce
5533: the code needed to import and export the content between C data and XML
5534: storage. This is left as an exercise to the reader :-)</p>
5535:
5536: <p>Feel free to use <a href="example/gjobread.c">the code for the full C
5537: parsing example</a> as a template, it is also available with Makefile in the
5538: Gnome SVN base under libxml2/example</p>
5539:
5540: <h2><a name="Contributi">Contributions</a></h2>
5541: <ul>
5542: <li>Bjorn Reese, William Brack and Thomas Broyer have provided a number of
5543: patches, Gary Pennington worked on the validation API, threading support
5544: and Solaris port.</li>
5545: <li>John Fleck helps maintaining the documentation and man pages.</li>
5546: <li><a href="mailto:igor@zlatkovic.com">Igor Zlatkovic</a> is now the
5547: maintainer of the Windows port, <a
5548: href="http://www.zlatkovic.com/projects/libxml/index.html">he provides
5549: binaries</a></li>
5550: <li><a href="mailto:Gary.Pennington@sun.com">Gary Pennington</a> provides
5551: <a href="http://garypennington.net/libxml2/">Solaris binaries</a></li>
5552: <li><a
5553: href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
5554: Sergeant</a> developed <a
5555: href="http://axkit.org/download/">XML::LibXSLT</a>, a Perl wrapper for
5556: libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML
5557: application server</a></li>
5558: <li><a href="mailto:fnatter@gmx.net">Felix Natter</a> and <a
5559: href="mailto:geertk@ai.rug.nl">Geert Kloosterman</a> provide <a
5560: href="libxml-doc.el">an emacs module</a> to lookup libxml(2) functions
5561: documentation</li>
5562: <li><a href="mailto:sherwin@nlm.nih.gov">Ziying Sherwin</a> provided <a
5563: href="http://xmlsoft.org/messages/0488.html">man pages</a></li>
5564: <li>there is a module for <a
5565: href="http://acs-misc.sourceforge.net/nsxml.html">libxml/libxslt support
5566: in OpenNSD/AOLServer</a></li>
5567: <li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provided the
5568: first version of libxml/libxslt <a
5569: href="http://www.rexx.com/~dkuhlman">wrappers for Python</a></li>
5570: <li>Petr Kozelka provides <a
5571: href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
5572: libxml2</a> with Kylix and Delphi and other Pascal compilers</li>
5573: <li><a href="mailto:aleksey@aleksey.com">Aleksey Sanin</a> implemented the
5574: <a href="http://www.w3.org/Signature/">XML Canonicalization and XML
5575: Digital Signature</a> <a
5576: href="http://www.aleksey.com/xmlsec/">implementations for libxml2</a></li>
5577: <li><a href="mailto:Steve.Ball@explain.com.au">Steve Ball</a> and
5578: contributors maintain <a href="http://tclxml.sourceforge.net/">tcl
5579: bindings for libxml2 and libxslt</a>, as well as <a
5580: href="http://tclxml.sf.net/tkxmllint.html">tkxmllint</a> a GUI for
5581: xmllint and <a href="http://tclxml.sf.net/tkxsltproc.html">tkxsltproc</a>
5582: a GUI for xsltproc.</li>
5583: </ul>
5584:
5585: <p></p>
5586: </body>
5587: </html>
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