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Daniel Veillardaf743792000-07-01 11:49:28 +000073<p>Table of Content:</p>
74<ul>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000075<li><a href="FAQ.html#Licence">Licence(s)</a></li>
76<li><a href="FAQ.html#Installati">Installation</a></li>
77<li><a href="FAQ.html#Compilatio">Compilation</a></li>
78<li><a href="FAQ.html#Developer">Developer corner</a></li>
Daniel Veillardaf743792000-07-01 11:49:28 +000079</ul>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000080<h3>
81<a name="Licence">Licence</a>(s)</h3>
Daniel Veillardaf743792000-07-01 11:49:28 +000082<ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000083<li>
84<em>Licensing Terms for libxml</em>
Daniel Veillardaf743792000-07-01 11:49:28 +000085 <p>libxml is released under 2 (compatible) licences:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000086<ul>
87<li>the <a href="http://www.gnu.org/copyleft/lgpl.html">LGPL</a>: GNU
Daniel Veillardaf743792000-07-01 11:49:28 +000088 Library General Public License</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000089<li>the <a href="http://www.w3.org/Consortium/Legal/copyright-software-19980720.html">W3C
Daniel Veillardaf743792000-07-01 11:49:28 +000090 IPR</a>: very similar to the XWindow licence</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000091</ul>
92</li>
93<li>
94<em>Can I embed libxml in a proprietary application ?</em>
Daniel Veillardaf743792000-07-01 11:49:28 +000095 <p>Yes. The W3C IPR allows you to also keep proprietary the changes you
96 made to libxml, but it would be graceful to provide back bugfixes and
Daniel Veillard008186f2001-09-13 14:24:44 +000097 improvements as patches for possible incorporation in the main
98 development tree</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +000099</li>
Daniel Veillardaf743792000-07-01 11:49:28 +0000100</ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000101<h3><a name="Installati">Installation</a></h3>
Daniel Veillardaf743792000-07-01 11:49:28 +0000102<ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000103<li>Unless you are forced to because your application links with a Gnome
Daniel Veillarde0c1d722001-03-21 10:28:36 +0000104 library requiring it, <strong><span style="background-color: #FF0000">Do
105 Not Use libxml1</span></strong>, use libxml2</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000106<li>
107<em>Where can I get libxml</em>
Daniel Veillard008186f2001-09-13 14:24:44 +0000108 ?
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000109 <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/stable/sources/libxml/">gnome.org</a>
110</p>
111<p>Most linux and Bsd distribution includes libxml, this is probably the
Daniel Veillardaf743792000-07-01 11:49:28 +0000112 safer way for end-users</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000113<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>
114</p>
115</li>
116<li>
117<em>I see libxml and libxml2 releases, which one should I install ?</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000118 <ul>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000119<li>If you are not concerned by any existing backward compatibility
Daniel Veillard008186f2001-09-13 14:24:44 +0000120 with existing application, install libxml2 only</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000121<li>If you are not doing development, you can safely install both.
122 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
Daniel Veillardaf743792000-07-01 11:49:28 +0000123 compatible (this is not the case for development packages)</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000124<li>If you are a developer and your system provides separate packaging
Daniel Veillard008186f2001-09-13 14:24:44 +0000125 for shared libraries and the development components, it is possible
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000126 to install libxml and libxml2, and also <a href="http://rpmfind.net/linux/RPM/libxml-devel.html">libxml-devel</a>
127 and <a href="http://rpmfind.net/linux/RPM/libxml2-devel.html">libxml2-devel</a>
Daniel Veillard480363b2001-03-16 22:04:15 +0000128 too for libxml2 &gt;= 2.3.0</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000129<li>If you are developing a new application, please develop against
Daniel Veillardaf743792000-07-01 11:49:28 +0000130 libxml2(-devel)</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000131</ul>
132</li>
133<li>
134<em>I can't install the libxml package it conflicts with libxml0</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000135 <p>You probably have an old libxml0 package used to provide the shared
136 library for libxml.so.0, you can probably safely remove it. Anyway the
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000137 libxml packages provided on <a href="ftp://rpmfind.net/pub/libxml/">rpmfind.net</a> provides
Daniel Veillardaf743792000-07-01 11:49:28 +0000138 libxml.so.0</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000139</li>
140<li>
141<em>I can't install the libxml(2) RPM package due to failed
Daniel Veillardc654d602001-05-01 12:42:26 +0000142 dependancies</em>
143 <p>The most generic solution is to refetch the latest src.rpm , and
144 rebuild it locally with</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000145<p><code>rpm --rebuild libxml(2)-xxx.src.rpm</code></p>
146<p>if everything goes well it will generate two binary rpm (one providing
Daniel Veillardc654d602001-05-01 12:42:26 +0000147 the shared libs and xmllint, and the other one, the -devel package
148 providing includes, static libraries and scripts needed to build
149 applications with libxml(2)) that you can install locally.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000150</li>
Daniel Veillardaf743792000-07-01 11:49:28 +0000151</ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000152<h3><a name="Compilatio">Compilation</a></h3>
Daniel Veillardaf743792000-07-01 11:49:28 +0000153<ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000154<li>
155<em>What is the process to compile libxml ?</em>
156 <p>As most UNIX libraries libxml follows the &quot;standard&quot;:</p>
157<p><code>gunzip -c xxx.tar.gz | tar xvf -</code></p>
158<p><code>cd libxml-xxxx</code></p>
159<p><code>./configure --help</code></p>
160<p>to see the options, then the compilation/installation proper</p>
161<p><code>./configure [possible options]</code></p>
162<p><code>make</code></p>
163<p><code>make install</code></p>
164<p>At that point you may have to rerun ldconfig or similar utility to
Daniel Veillardaf743792000-07-01 11:49:28 +0000165 update your list of installed shared libs.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000166</li>
167<li>
168<em>What other libraries are needed to compile/install libxml ?</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000169 <p>Libxml does not requires any other library, the normal C ANSI API
170 should be sufficient (please report any violation to this rule you may
171 find).</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000172<p>However if found at configuration time libxml will detect and use the
Daniel Veillardaf743792000-07-01 11:49:28 +0000173 following libs:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000174<ul>
175<li>
176<a href="http://www.info-zip.org/pub/infozip/zlib/">libz</a>
Daniel Veillard008186f2001-09-13 14:24:44 +0000177 : a highly portable and available widely compression library</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000178<li>iconv: a powerful character encoding conversion library. It's
Daniel Veillardaf743792000-07-01 11:49:28 +0000179 included by default on recent glibc libraries, so it doesn't need to
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000180 be installed specifically on linux. It seems it's now <a href="http://www.opennc.org/onlinepubs/7908799/xsh/iconv.html">part
181 of the official UNIX</a> specification. Here is one <a href="http://clisp.cons.org/~haible/packages-libiconv.html">implementation
182 of the library</a> which source can be found <a href="ftp://ftp.ilog.fr/pub/Users/haible/gnu/">here</a>.</li>
183</ul>
184</li>
185<li>
186<em>libxml does not compile with HP-UX's optional ANSI-C compiler</em>
187 <p>this is due to macro limitations. Try to add &quot; -Wp,-H16800 -Ae&quot; to the
Daniel Veillardaf743792000-07-01 11:49:28 +0000188 CFLAGS</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000189<p>you can also install and use gcc instead or use a precompiled version
190 of libxml, both available from the <a href="http://hpux.cae.wisc.edu/hppd/auto/summary_all.html">HP-UX Porting
191 and Archive Centre</a>
192</p>
193</li>
194<li>
195<em>make check fails on some platforms</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000196 <p>Sometime the regression tests results don't completely match the value
197 produced by the parser, and the makefile uses diff to print the delta. On
Daniel Veillard008186f2001-09-13 14:24:44 +0000198 some platforms the diff return breaks the compilation process, if the
199 diff is small this is probably not a serious problem</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000200</li>
201<li>
202<em>I use the CVS version and there is no configure script</em>
Daniel Veillard6761eee2001-06-11 10:29:38 +0000203 <p>The configure (and other Makefiles) are generated. Use the autogen.sh
204 script to regenerate the configure and Makefiles, like:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000205<p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
206</li>
207<li>
208<em>I have troubles when running make tests with gcc-3.0</em>
Daniel Veillard7b06bcb2001-06-22 16:03:51 +0000209 <p>It seems the initial release of gcc-3.0 has a problem with the
210 optimizer which miscompiles the URI module. Please use another
211 compiler</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000212</li>
Daniel Veillardaf743792000-07-01 11:49:28 +0000213</ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000214<h3>
215<a name="Developer">Developer</a> corner</h3>
Daniel Veillardaf743792000-07-01 11:49:28 +0000216<ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000217<li>
218<em>xmlDocDump() generates output on one line</em>
Daniel Veillard008186f2001-09-13 14:24:44 +0000219 <p>libxml will not <strong>invent</strong> spaces in the content of a
220 document since <strong>all spaces in the content of a document are
221 significant</strong>. If you build a tree from the API and want
222 indentation:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000223<ol>
224<li>the correct way is to generate those yourself too</li>
225<li>the dangerous way is to ask libxml to add those blanks to your
Daniel Veillard008186f2001-09-13 14:24:44 +0000226 content <strong>modifying the content of your document in the
227 process</strong>. The result may not be what you expect. There is
228 <strong>NO</strong> way to guarantee that such a modification won't
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000229 impact other part of the content of your document. See <a href="http://xmlsoft.org/html/libxml-parser.html#XMLKEEPBLANKSDEFAULT">xmlKeepBlanksDefault
230 ()</a> and <a href="http://xmlsoft.org/html/libxml-tree.html#XMLSAVEFORMATFILE">xmlSaveFormatFile
231 ()</a>
232</li>
233</ol>
234</li>
235<li>Extra nodes in the document:
Daniel Veillard62bccd52001-02-10 09:40:10 +0000236 <p><em>For a XML file as below:</em></p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000237<pre>&lt;?xml version=&quot;1.0&quot;?&gt;
238&lt;PLAN xmlns=&quot;http://www.argus.ca/autotest/1.0/&quot;&gt;
239&lt;NODE CommFlag=&quot;0&quot;/&gt;
240&lt;NODE CommFlag=&quot;1&quot;/&gt;
Daniel Veillard62bccd52001-02-10 09:40:10 +0000241&lt;/PLAN&gt;</pre>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000242<p><em>after parsing it with the function
Daniel Veillard480363b2001-03-16 22:04:15 +0000243 pxmlDoc=xmlParseFile(...);</em></p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000244<p><em>I want to the get the content of the first node (node with the
245 CommFlag=&quot;0&quot;)</em></p>
246<p><em>so I did it as following;</em></p>
247<pre>xmlNodePtr pode;
Daniel Veillard62bccd52001-02-10 09:40:10 +0000248pnode=pxmlDoc-&gt;children-&gt;children;</pre>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000249<p><em>but it does not work. If I change it to</em></p>
250<pre>pnode=pxmlDoc-&gt;children-&gt;children-&gt;next;</pre>
251<p><em>then it works. Can someone explain it to me.</em></p>
252<p>
253<p>In XML all characters in the content of the document are significant
Daniel Veillard7f41b3e2001-02-10 09:35:37 +0000254 <strong>including blanks and formatting line breaks</strong>.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000255<p>The extra nodes you are wondering about are just that, text nodes with
Daniel Veillard7f41b3e2001-02-10 09:35:37 +0000256 the formatting spaces wich are part of the document but that people tend
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000257 to forget. There is a function <a href="http://xmlsoft.org/html/libxml-parser.html">xmlKeepBlanksDefault
Daniel Veillard7f41b3e2001-02-10 09:35:37 +0000258 ()</a> to remove those at parse time, but that's an heuristic, and its
Daniel Veillard008186f2001-09-13 14:24:44 +0000259 use should be limited to case where you are sure there is no
260 mixed-content in the document.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000261</li>
262<li>
263<em>I get compilation errors of existing code like when accessing
Daniel Veillardaf743792000-07-01 11:49:28 +0000264 <strong>root</strong> or <strong>childs fields</strong> of nodes</em>
Daniel Veillard3f3b4f32001-03-13 15:12:39 +0000265 <p>You are compiling code developed for libxml version 1 and using a
266 libxml2 development environment. Either switch back to libxml v1 devel or
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000267 even better fix the code to compile with libxml2 (or both) by <a href="upgrade.html">following the instructions</a>.</p>
268</li>
269<li>
270<em>I get compilation errors about non existing
Daniel Veillardaf743792000-07-01 11:49:28 +0000271 <strong>xmlRootNode</strong> or <strong>xmlChildrenNode</strong>
272 fields</em>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000273 <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 +0000274 and libxml2, but you need to install a more recent version:
275 libxml(-devel) &gt;= 1.8.8 or libxml2(-devel) &gt;= 2.1.0</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000276</li>
277<li>
278<em>XPath implementation looks seriously broken</em>
Daniel Veillard008186f2001-09-13 14:24:44 +0000279 <p>XPath implementation prior to 2.3.0 was really incomplete, upgrade to
280 a recent version, the implementation and debug of libxslt generated fixes
Daniel Veillard480363b2001-03-16 22:04:15 +0000281 for most obvious problems.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000282</li>
283<li>
284<em>The example provided in the web page does not compile</em>
Daniel Veillardaf743792000-07-01 11:49:28 +0000285 <p>It's hard to maintain the documentation in sync with the code
Daniel Veillarde9202a02000-10-16 16:58:19 +0000286 &lt;grin/&gt; ...</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000287<p>Check the previous points 1/ and 2/ raised before, and send
Daniel Veillardaf743792000-07-01 11:49:28 +0000288 patches.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000289</li>
290<li>
291<em>Where can I get more examples and informations than in the web
Daniel Veillardaf743792000-07-01 11:49:28 +0000292 page</em>
293 <p>Ideally a libxml book would be nice. I have no such plan ... But you
294 can:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000295<ul>
296<li>check more deeply the <a href="html/libxml-lib.html">existing
297 generated doc</a>
298</li>
299<li>looks for examples of use for libxml function using the Gnome code
Daniel Veillardaf743792000-07-01 11:49:28 +0000300 for example the following will query the full Gnome CVs base for the
301 use of the <strong>xmlAddChild()</strong> function:
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000302 <p><a href="http://cvs.gnome.org/lxr/search?string=xmlAddChild">http://cvs.gnome.org/lxr/search?string=xmlAddChild</a></p>
303<p>This may be slow, a large hardware donation to the gnome project
Daniel Veillardaf743792000-07-01 11:49:28 +0000304 could cure this :-)</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000305</li>
306<li>
307<a href="http://cvs.gnome.org/bonsai/rview.cgi?cvsroot=/cvs/gnome&amp;dir=gnome-xml">Browse
Daniel Veillard008186f2001-09-13 14:24:44 +0000308 the libxml source</a>
309 , I try to write code as clean and documented as possible, so
310 looking at it may be helpful</li>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000311</ul>
312</li>
313<li>What about C++ ?
Daniel Veillard008186f2001-09-13 14:24:44 +0000314 <p>libxml is written in pure C in order to allow easy reuse on a number
315 of platforms, including embedded systems. I don't intend to convert to
Daniel Veillardaf743792000-07-01 11:49:28 +0000316 C++.</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000317<p>There is however a C++ wrapper provided by Ari Johnson
Daniel Veillarde9202a02000-10-16 16:58:19 +0000318 &lt;ari@btigate.com&gt; which may fullfill your needs:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000319<p>Website: <a href="http://lusis.org/~ari/xml++/">http://lusis.org/~ari/xml++/</a>
320</p>
321<p>Download: <a href="http://lusis.org/~ari/xml++/libxml++.tar.gz">http://lusis.org/~ari/xml++/libxml++.tar.gz</a>
322</p>
323</li>
324<li>How to validate a document a posteriori ?
Daniel Veillardaf743792000-07-01 11:49:28 +0000325 <p>It is possible to validate documents which had not been validated at
326 initial parsing time or documents who have been built from scratch using
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000327 the API. Use the <a href="http://xmlsoft.org/html/libxml-valid.html#XMLVALIDATEDTD">xmlValidateDtd()</a>
Daniel Veillardaf743792000-07-01 11:49:28 +0000328 function. It is also possible to simply add a Dtd to an existing
329 document:</p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000330<pre>xmlDocPtr doc; /* your existing document */
Daniel Veillardaf743792000-07-01 11:49:28 +0000331 xmlDtdPtr dtd = xmlParseDTD(NULL, filename_of_dtd); /* parse the DTD */
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000332 dtd-&gt;name = xmlStrDup((xmlChar*)&quot;root_name&quot;); /* use the given root */
Daniel Veillardaf743792000-07-01 11:49:28 +0000333
Daniel Veillarde9202a02000-10-16 16:58:19 +0000334 doc-&gt;intSubset = dtd;
335 if (doc-&gt;children == NULL) xmlAddChild((xmlNodePtr)doc, (xmlNodePtr)dtd);
336 else xmlAddPrevSibling(doc-&gt;children, (xmlNodePtr)dtd);
Daniel Veillardaf743792000-07-01 11:49:28 +0000337 </pre>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000338</li>
339<li>etc ...</li>
Daniel Veillardaf743792000-07-01 11:49:28 +0000340</ol>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000341<p>
Daniel Veillardc5d64342001-06-24 12:13:24 +0000342<p><a href="mailto:daniel@veillard.com">Daniel Veillard</a></p>
Daniel Veillardb8cfbd12001-10-25 10:53:28 +0000343</td></tr></table></td></tr></table></td></tr></table></td>
344</tr></table></td></tr></table>
Daniel Veillardaf743792000-07-01 11:49:28 +0000345</body>
346</html>