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Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]10</style><title>FAQ</title></head><body bgcolor="#8b7765" text="#000000" link="#000000" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="180"><a href="http://www.gnome.org/"><img src="gnome2.png" alt="Gnome2 Logo" /></a><a href="http://www.w3.org/Status"><img src="w3c.png" alt="W3C Logo" /></a><a href="http://www.redhat.com/"><img src="redhat.gif" alt="Red Hat Logo" /></a><div align="left"><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-180x168.gif" alt="Made with Libxml2 Logo" /></a></div></td><td><table border="0" width="90%" cellpadding="2" cellspacing="0" align="center" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3" bgcolor="#fffacd"><tr><td align="center"><h1>The XML C library for Gnome</h1><h2>FAQ</h2></td></tr></table></td></tr></table></td></tr></table><table border="0" cellpadding="4" cellspacing="0" width="100%" align="center"><tr><td bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="2" width="100%"><tr><td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3"><tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Main Menu</b></center></td></tr><tr><td bgcolor="#fffacd"><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="20" value="" /><input name="submit" type="submit" value="Search ..." /></form><ul><li><a href="index.html">Home</a></li><li><a href="intro.html">Introduction</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="docs.html">Developer Documentation</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="help.html">How to help</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="news.html">News</a></li><li><a href="XMLinfo.html">XML</a></li><li><a href="XSLT.html">XSLT</a></li><li><a href="xmldtd.html">Validation &amp; DTDs</a></li><li><a href="encoding.html">Encodings support</a></li><li><a href="catalog.html">Catalog support</a></li><li><a href="namespaces.html">Namespaces</a></li><li><a href="contribs.html">Contributions</a></li><li><a href="guidelines.html">XML Guidelines</a></li></ul></td></tr></table><table width="100%" border="0" cellspacing="1" cellpadding="3"><tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Related links</b></center></td></tr><tr><td bgcolor="#fffacd"><ul><li><a href="http://mail.gnome.org/archives/xml/">Mail archive</a></li><li><a href="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li><li><a href="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li><li><a href="http://www.aleksey.com/xmlsec/">XML-DSig xmlsec</a></li><li><a href="ftp://xmlsoft.org/">FTP</a></li><li><a href="http://www.zlatkovic.com/projects/libxml/">Windows binaries</a></li><li><a href="http://garypennington.net/libxml2/">Solaris binaries</a></li><li><a href="http://www.zveno.com/open_source/libxml2xslt.html">MacOsX binaries</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml&amp;product=libxml2">Bug Tracker</a></li></ul></td></tr></table></td></tr></table></td><td valign="top" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%"><tr><td><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table border="0" cellpadding="3" cellspacing="1" width="100%"><tr><td bgcolor="#fffacd"><p>Table of Contents:</p><ul><li><a href="FAQ.html#License">License(s)</a></li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]11 <li><a href="FAQ.html#Installati">Installation</a></li>
12 <li><a href="FAQ.html#Compilatio">Compilation</a></li>
13 <li><a href="FAQ.html#Developer">Developer corner</a></li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]14</ul><h3><a name="License" id="License">License</a>(s)</h3><ol><li><em>Licensing Terms for libxml</em>
Daniel Veillardc575b992002-02-08 13:28:40 +0000[diff] [blame]15 <p>libxml is released under the <a href="http://www.opensource.org/licenses/mit-license.html">MIT
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]16 License</a>; see the file Copyright in the distribution for the precise
Daniel Veillardc575b992002-02-08 13:28:40 +0000[diff] [blame]17 wording</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]18 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]19 <li><em>Can I embed libxml in a proprietary application ?</em>
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]20 <p>Yes. The MIT License allows you to keep proprietary the changes you
21 made to libxml, but it would be graceful to send-back bug fixes and
22 improvements as patches for possible incorporation in the main
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]23 development tree.</p>
24 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]25</ol><h3><a name="Installati" id="Installati">Installation</a></h3><ol><li>Unless you are forced to because your application links with a Gnome
Daniel Veillarde0c1d722001-03-21 10:28:36 +0000[diff] [blame]26 library requiring it, <strong><span style="background-color: #FF0000">Do
27 Not Use libxml1</span></strong>, use libxml2</li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]28 <li><em>Where can I get libxml</em> ?
29 <p>The original distribution comes from <a href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> or <a href="ftp://ftp.gnome.org/pub/GNOME/sources/libxml2/2.5/">gnome.org</a></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]30 <p>Most Linux and BSD distributions include libxml, this is probably the
31 safer way for end-users to use libxml.</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]32 <p>David Doolin provides precompiled Windows versions at <a href="http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/ ">http://www.ce.berkeley.edu/~doolin/code/libxmlwin32/</a></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]33 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]34 <li><em>I see libxml and libxml2 releases, which one should I install ?</em>
35 <ul><li>If you are not constrained by backward compatibility issues with
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]36 existing applications, install libxml2 only</li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]37 <li>If you are not doing development, you can safely install both.
38 Usually the packages <a href="http://rpmfind.net/linux/RPM/libxml.html">libxml</a> and <a href="http://rpmfind.net/linux/RPM/libxml2.html">libxml2</a> are
39 compatible (this is not the case for development packages).</li>
40 <li>If you are a developer and your system provides separate packaging
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]41 for shared libraries and the development components, it is possible
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]42 to install libxml and libxml2, and also <a href="http://rpmfind.net/linux/RPM/libxml-devel.html">libxml-devel</a>
43 and <a href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml2-devel</a>
Daniel Veillard480363b2001-03-16 22:04:15 +0000[diff] [blame]44 too for libxml2 &gt;= 2.3.0</li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]45 <li>If you are developing a new application, please develop against
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]46 libxml2(-devel)</li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]47 </ul></li>
48 <li><em>I can't install the libxml package, it conflicts with libxml0</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]49 <p>You probably have an old libxml0 package used to provide the shared
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]50 library for libxml.so.0, you can probably safely remove it. The libxml
51 packages provided on <a href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> provide
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]52 libxml.so.0</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]53 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]54 <li><em>I can't install the libxml(2) RPM package due to failed
Daniel Veillard63d83142002-05-20 06:51:05 +0000[diff] [blame]55 dependencies</em>
56 <p>The most generic solution is to re-fetch the latest src.rpm , and
Daniel Veillardc654d602001-05-01 12:42:26 +0000[diff] [blame]57 rebuild it locally with</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]58 <p><code>rpm --rebuild libxml(2)-xxx.src.rpm</code>.</p>
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]59 <p>If everything goes well it will generate two binary rpm packages (one
60 providing the shared libs and xmllint, and the other one, the -devel
61 package, providing includes, static libraries and scripts needed to build
Daniel Veillardc654d602001-05-01 12:42:26 +0000[diff] [blame]62 applications with libxml(2)) that you can install locally.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]63 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]64</ol><h3><a name="Compilatio" id="Compilatio">Compilation</a></h3><ol><li><em>What is the process to compile libxml ?</em>
Daniel Veillard21473672002-06-17 07:29:22 +0000[diff] [blame]65 <p>As most UNIX libraries libxml follows the &quot;standard&quot;:</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]66 <p><code>gunzip -c xxx.tar.gz | tar xvf -</code></p>
67 <p><code>cd libxml-xxxx</code></p>
68 <p><code>./configure --help</code></p>
69 <p>to see the options, then the compilation/installation proper</p>
70 <p><code>./configure [possible options]</code></p>
71 <p><code>make</code></p>
72 <p><code>make install</code></p>
73 <p>At that point you may have to rerun ldconfig or a similar utility to
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]74 update your list of installed shared libs.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]75 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]76 <li><em>What other libraries are needed to compile/install libxml ?</em>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]77 <p>Libxml does not require any other library, the normal C ANSI API
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]78 should be sufficient (please report any violation to this rule you may
79 find).</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]80 <p>However if found at configuration time libxml will detect and use the
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]81 following libs:</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]82 <ul><li><a href="http://www.info-zip.org/pub/infozip/zlib/">libz</a> : a
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]83 highly portable and available widely compression library.</li>
84 <li>iconv: a powerful character encoding conversion library. It is
85 included by default in recent glibc libraries, so it doesn't need to
86 be installed specifically on Linux. It now seems a <a href="http://www.opennc.org/onlinepubs/7908799/xsh/iconv.html">part
Daniel Veillarddad3f682002-11-17 16:47:27 +0000[diff] [blame]87 of the official UNIX</a> specification. Here is one <a href="http://www.gnu.org/software/libiconv/">implementation of the
88 library</a> which source can be found <a href="ftp://ftp.ilog.fr/pub/Users/haible/gnu/">here</a>.</li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]89 </ul></li>
90 <li><em>Make check fails on some platforms</em>
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]91 <p>Sometimes the regression tests' results don't completely match the
92 value produced by the parser, and the makefile uses diff to print the
93 delta. On some platforms the diff return breaks the compilation process;
94 if the diff is small this is probably not a serious problem.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]95 <p>Sometimes (especially on Solaris) make checks fail due to limitations
Daniel Veillarde46182c2002-02-12 14:29:11 +0000[diff] [blame]96 in make. Try using GNU-make instead.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]97 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]98 <li><em>I use the CVS version and there is no configure script</em>
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]99 <p>The configure script (and other Makefiles) are generated. Use the
100 autogen.sh script to regenerate the configure script and Makefiles,
101 like:</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]102 <p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
103 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]104 <li><em>I have troubles when running make tests with gcc-3.0</em>
Daniel Veillard7b06bcb2001-06-22 16:03:51 +0000[diff] [blame]105 <p>It seems the initial release of gcc-3.0 has a problem with the
106 optimizer which miscompiles the URI module. Please use another
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]107 compiler.</p>
108 </li>
Daniel Veillard93d95252003-04-29 20:25:40 +0000[diff] [blame^]109</ol><h3><a name="Developer" id="Developer">Developer</a> corner</h3><ol><li><em>Troubles compiling or linking programs using libxml2</em>
110 <p>Usually the problem comes from the fact that the compiler doesn't get
111 the right compilation or linking flags. There is a small shell script
112 <code>xml2-config</code> which is installed as part of libxml2 usual
113 install process which provides those flags. Use </p>
114 <p><code>xml2-config --cflags</code></p>
115 <p>to get the compilation flags and</p>
116 <p><code>xml2-config --libs</code></p>
117 <p>to get the linker flags. Usually this is done directly from the
118 Makefile as:</p>
119 <p><code>CFLAGS=`xml2-config --cflags`</code></p>
120 <p><code>LIBS=`xml2-config --libs`</code></p>
121 </li>
122 <li><em>xmlDocDump() generates output on one line.</em>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]123 <p>Libxml will not <strong>invent</strong> spaces in the content of a
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]124 document since <strong>all spaces in the content of a document are
125 significant</strong>. If you build a tree from the API and want
126 indentation:</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]127 <ol><li>the correct way is to generate those yourself too.</li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]128 <li>the dangerous way is to ask libxml to add those blanks to your
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]129 content <strong>modifying the content of your document in the
130 process</strong>. The result may not be what you expect. There is
131 <strong>NO</strong> way to guarantee that such a modification won't
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]132 affect other parts of the content of your document. See <a href="http://xmlsoft.org/html/libxml-parser.html#XMLKEEPBLANKSDEFAULT">xmlKeepBlanksDefault
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]133 ()</a> and <a href="http://xmlsoft.org/html/libxml-tree.html#XMLSAVEFORMATFILE">xmlSaveFormatFile
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]134 ()</a></li>
135 </ol></li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]136 <li>Extra nodes in the document:
Daniel Veillard62bccd52001-02-10 09:40:10 +0000[diff] [blame]137 <p><em>For a XML file as below:</em></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]138 <pre>&lt;?xml version=&quot;1.0&quot;?&gt;
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]139&lt;PLAN xmlns=&quot;http://www.argus.ca/autotest/1.0/&quot;&gt;
140&lt;NODE CommFlag=&quot;0&quot;/&gt;
141&lt;NODE CommFlag=&quot;1&quot;/&gt;
Daniel Veillard62bccd52001-02-10 09:40:10 +0000[diff] [blame]142&lt;/PLAN&gt;</pre>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]143 <p><em>after parsing it with the function
Daniel Veillard480363b2001-03-16 22:04:15 +0000[diff] [blame]144 pxmlDoc=xmlParseFile(...);</em></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]145 <p><em>I want to the get the content of the first node (node with the
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]146 CommFlag=&quot;0&quot;)</em></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]147 <p><em>so I did it as following;</em></p>
148 <pre>xmlNodePtr pnode;
Daniel Veillard62bccd52001-02-10 09:40:10 +0000[diff] [blame]149pnode=pxmlDoc-&gt;children-&gt;children;</pre>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]150 <p><em>but it does not work. If I change it to</em></p>
151 <pre>pnode=pxmlDoc-&gt;children-&gt;children-&gt;next;</pre>
152 <p><em>then it works. Can someone explain it to me.</em></p>
Daniel Veillard6581e1b2003-02-09 22:21:43 +0000[diff] [blame]153 <p></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]154 <p>In XML all characters in the content of the document are significant
Daniel Veillard7f41b3e2001-02-10 09:35:37 +0000[diff] [blame]155 <strong>including blanks and formatting line breaks</strong>.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]156 <p>The extra nodes you are wondering about are just that, text nodes with
Daniel Veillard63d83142002-05-20 06:51:05 +0000[diff] [blame]157 the formatting spaces which are part of the document but that people tend
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]158 to forget. There is a function <a href="http://xmlsoft.org/html/libxml-parser.html">xmlKeepBlanksDefault
Daniel Veillard7f41b3e2001-02-10 09:35:37 +0000[diff] [blame]159 ()</a> to remove those at parse time, but that's an heuristic, and its
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]160 use should be limited to cases where you are certain there is no
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]161 mixed-content in the document.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]162 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]163 <li><em>I get compilation errors of existing code like when accessing
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]164 <strong>root</strong> or <strong>child fields</strong> of nodes.</em>
Daniel Veillard3f3b4f32001-03-13 15:12:39 +0000[diff] [blame]165 <p>You are compiling code developed for libxml version 1 and using a
166 libxml2 development environment. Either switch back to libxml v1 devel or
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]167 even better fix the code to compile with libxml2 (or both) by <a href="upgrade.html">following the instructions</a>.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]168 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]169 <li><em>I get compilation errors about non existing
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]170 <strong>xmlRootNode</strong> or <strong>xmlChildrenNode</strong>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]171 fields.</em>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]172 <p>The source code you are using has been <a href="upgrade.html">upgraded</a> to be able to compile with both libxml
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]173 and libxml2, but you need to install a more recent version:
174 libxml(-devel) &gt;= 1.8.8 or libxml2(-devel) &gt;= 2.1.0</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]175 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]176 <li><em>XPath implementation looks seriously broken</em>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]177 <p>XPath implementation prior to 2.3.0 was really incomplete. Upgrade to
178 a recent version, there are no known bugs in the current version.</p>
179 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]180 <li><em>The example provided in the web page does not compile.</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]181 <p>It's hard to maintain the documentation in sync with the code
Daniel Veillarde9202a02000-10-16 16:58:19 +0000[diff] [blame]182 &lt;grin/&gt; ...</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]183 <p>Check the previous points 1/ and 2/ raised before, and please send
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]184 patches.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]185 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]186 <li><em>Where can I get more examples and information than privoded on the
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]187 web page?</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]188 <p>Ideally a libxml book would be nice. I have no such plan ... But you
189 can:</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]190 <ul><li>check more deeply the <a href="html/libxml-lib.html">existing
191 generated doc</a></li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]192 <li>look for examples of use for libxml function using the Gnome code.
193 For example the following will query the full Gnome CVS base for the
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]194 use of the <strong>xmlAddChild()</strong> function:
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]195 <p><a href="http://cvs.gnome.org/lxr/search?string=xmlAddChild">http://cvs.gnome.org/lxr/search?string=xmlAddChild</a></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]196 <p>This may be slow, a large hardware donation to the gnome project
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]197 could cure this :-)</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]198 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]199 <li><a href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&amp;dir=gnome-xml">Browse
Daniel Veillardaf43f632002-03-08 15:05:20 +0000[diff] [blame]200 the libxml source</a> , I try to write code as clean and documented
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]201 as possible, so looking at it may be helpful. In particular the code
202 of xmllint.c and of the various testXXX.c test programs should
203 provide good examples of how to do things with the library.</li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]204 </ul></li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]205 <li>What about C++ ?
Daniel Veillard008186f2001-09-13 14:24:44 +0000[diff] [blame]206 <p>libxml is written in pure C in order to allow easy reuse on a number
207 of platforms, including embedded systems. I don't intend to convert to
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]208 C++.</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]209 <p>There are however a few C++ wrappers which may fulfill your needs:</p>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]210 <ul><li>by Ari Johnson &lt;ari@btigate.com&gt;:
211 <p>Website: <a href="http://lusis.org/~ari/xml++/">http://lusis.org/~ari/xml++/</a></p>
212 <p>Download: <a href="http://lusis.org/~ari/xml++/libxml++.tar.gz">http://lusis.org/~ari/xml++/libxml++.tar.gz</a></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]213 </li>
214 <li>by Peter Jones &lt;pjones@pmade.org&gt;
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]215 <p>Website: <a href="http://pmade.org/pjones/software/xmlwrapp/">http://pmade.org/pjones/software/xmlwrapp/</a></p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]216 </li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]217 </ul></li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]218 <li>How to validate a document a posteriori ?
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]219 <p>It is possible to validate documents which had not been validated at
Daniel Veillard42766c02002-08-22 20:52:17 +0000[diff] [blame]220 initial parsing time or documents which have been built from scratch
221 using the API. Use the <a href="http://xmlsoft.org/html/libxml-valid.html#XMLVALIDATEDTD">xmlValidateDtd()</a>
Daniel Veillard63d83142002-05-20 06:51:05 +0000[diff] [blame]222 function. It is also possible to simply add a DTD to an existing
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]223 document:</p>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]224 <pre>xmlDocPtr doc; /* your existing document */
225xmlDtdPtr dtd = xmlParseDTD(NULL, filename_of_dtd); /* parse the DTD */
226
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000[diff] [blame]227 dtd-&gt;name = xmlStrDup((xmlChar*)&quot;root_name&quot;); /* use the given root */
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]228
Daniel Veillarde9202a02000-10-16 16:58:19 +0000[diff] [blame]229 doc-&gt;intSubset = dtd;
230 if (doc-&gt;children == NULL) xmlAddChild((xmlNodePtr)doc, (xmlNodePtr)dtd);
231 else xmlAddPrevSibling(doc-&gt;children, (xmlNodePtr)dtd);
Daniel Veillardaf743792000-07-01 11:49:28 +0000[diff] [blame]232 </pre>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]233 </li>
Daniel Veillarddad3f682002-11-17 16:47:27 +0000[diff] [blame]234 <li>So what is this funky &quot;xmlChar&quot; used all the time?
235 <p>It is a null terminated sequence of utf-8 characters. And only utf-8!
236 You need to convert strings encoded in different ways to utf-8 before
237 passing them to the API. This can be accomplished with the iconv library
238 for instance.</p>
John Fleck61f6fb62002-10-31 15:23:29 +0000[diff] [blame]239 </li>
Daniel Veillard0b28e882002-07-24 23:47:05 +0000[diff] [blame]240 <li>etc ...</li>
Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]241</ol><p></p><p><a href="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html>