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Fixing the screwups introduced by amaya, Daniel

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Daniel Veillard
2006-06-09 13:40:33 +00:00
parent d9d50ec150
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17 changed files with 2116 additions and 2100 deletions
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@ -8,52 +8,56 @@ H2 {font-family: Verdana,Arial,Helvetica}
H3 {font-family: Verdana,Arial,Helvetica}
A:link, A:visited, A:active { text-decoration: underline }
</style><title>Python and bindings</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="120"><a href="http://swpat.ffii.org/"><img src="epatents.png" alt="Action against software patents" /></a></td><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/XSLT/"><img src="Libxslt-Logo-180x168.gif" alt="Made with Libxslt 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 XSLT C library for Gnome</h1><h2>Python and bindings</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="http://xmlsoft.org/wiki">Wiki</a></li><li><a href="intro.html">Introduction</a></li><li><a href="docs.html">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="FAQ.html">FAQ</a></li><li><a href="news.html">News</a></li><li><a href="xsltproc2.html">The xsltproc tool</a></li><li><a href="docbook.html">DocBook</a></li><li><a href="API.html">The programming API</a></li><li><a href="python.html">Python and bindings</a></li><li><a href="internals.html">Library internals</a></li><li><a href="extensions.html">Writing extensions</a></li><li><a href="contribs.html">Contributions</a></li><li><a href="EXSLT/index.html" style="font-weight:bold">libexslt</a></li><li><a href="xslt.html">flat page</a>, <a href="site.xsl">stylesheet</a></li><li><a href="html/index.html" style="font-weight:bold">API Menu</a></li><li><a href="ChangeLog.html">ChangeLog</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="tutorial/libxslttutorial.html">Tutorial</a>,
<a href="tutorial2/libxslt_pipes.html">Tutorial2</a></li><li><a href="xsltproc.html">Man page for xsltproc</a></li><li><a href="http://mail.gnome.org/archives/xslt/">Mail archive</a></li><li><a href="http://xmlsoft.org/">XML libxml2</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.explain.com.au/oss/libxml2xslt.html">MacOsX binaries</a></li><li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxslt">Bug Tracker</a></li><li><a href="http://www.zend.com/php5/articles/php5-xmlphp.php#Heading17">XSLT with PHP</a></li><li><a href="http://www.mod-xslt2.com/">Apache module</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://xsldbg.sourceforge.net/">Xsldbg Debugger</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>API Indexes</b></center></td></tr><tr><td bgcolor="#fffacd"><ul><li><a href="APIchunk0.html">Alphabetic</a></li><li><a href="APIconstructors.html">Constructors</a></li><li><a href="APIfunctions.html">Functions/Types</a></li><li><a href="APIfiles.html">Modules</a></li><li><a href="APIsymbols.html">Symbols</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>There is a number of language bindings and wrappers available for
libxml2,the list below is not exhaustive. Please contact the <a href="http://mail.gnome.org/mailman/listinfo/xml-bindings">xml-bindings@gnome.org</a>(<a href="http://mail.gnome.org/archives/xml-bindings/">archives</a>) inorder to
get updates to this list or to discuss the specific topic of libxml2or
libxslt wrappers or bindings:</p><ul><li><a href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">MattSergeant</a>developped
<a href="http://axkit.org/download/">XML::LibXMLand XML::LibXSLT</a>,
Perl wrappers for libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML application server</a></li>
<li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a>provides
andearlier version of the libxml/libxslt <a href="http://www.rexx.com/~dkuhlman">wrappers for Python</a></li>
<li>Petr Kozelka provides <a href="http://sourceforge.net/projects/libxml2-pas">Pascal units to
gluelibxml2</a>with Kylix, Delphi and other Pascal compilers</li>
<li>Wai-Sun "Squidster" Chia provides <a href="http://www.rubycolor.org/arc/redist/">bindings for
Ruby</a>andlibxml2 bindings are also available in Ruby through the <a href="http://libgdome-ruby.berlios.de/">libgdome-ruby</a>modulemaintained
by Tobias Peters.</li>
<li>Steve Ball and contributors maintains <a href="http://tclxml.sourceforge.net/">libxml2 and libxslt bindings
forTcl</a></li>
<li><a href="mailto:xmlwrapp@pmade.org">Peter Jones</a>maintains
C++bindings for libxslt within <a href="http://pmade.org/pjones/software/xmlwrapp/">xmlwrapp</a></li>
<li><a href="phillim2@comcast.net">Mike Phillips</a>provides a moduleusing
<a href="http://siasl.dyndns.org/projects/projects.html">libxsltfor
PHP</a>.</li>
<li><a href="http://savannah.gnu.org/projects/classpathx/">LibxmlJ</a>isan
effort to create a 100% JAXP-compatible Java wrapper for libxml2
andlibxslt as part of GNU ClasspathX project.</li>
<li>Patrick McPhee provides Rexx bindings fof libxml2 and libxslt, look
for<a href="http://www.interlog.com/~ptjm/software.html">RexxXML</a>.</li>
<li><a href="http://www.satimage.fr/software/en/xml_suite.html">Satimage</a>provides
<a href="http://www.satimage.fr/software/en/downloads_osaxen.html">XMLLibosax</a>.
This is an osax for Mac OS X with a set of commands toimplement in
AppleScript the XML DOM, XPATH and XSLT.</li>
</ul><p>The libxslt Python module depends on the <a href="http://xmlsoft.org/python.html">libxml2 Python</a>module.</p><p>The distribution includes a set of Python bindings, which are garanteed
tobe maintained as part of the library in the future, though the
Pythoninterface have not yet reached the completeness of the C API.</p><p><a href="mailto:stephane.bidoul@softwareag.com">St<EFBFBD>phane
Bidoul</a>maintains <a href="http://users.skynet.be/sbi/libxml-python/">a
Windows portof the Python bindings</a>.</p><p>Note to people interested in building bindings, the API is formalized as<a href="libxslt-api.xml">an XML API description file</a>which allows toautomate
a large part of the Python bindings, this includes functiondescriptions,
enums, structures, typedefs, etc... The Python script used tobuild the
bindings is python/generator.py in the source distribution.</p><p>To install the Python bindings there are 2 options:</p><ul><li>If you use an RPM based distribution, simply install the <a href="http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python">libxml2-pythonRPM</a>and
the <a href="http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python">libxslt-pythonRPM</a>.</li>
<li>Otherwise use the <a href="ftp://xmlsoft.org/libxml2/python/">libxml2-pythonmodule
distribution</a>corresponding to your installed version oflibxml2 and
libxslt. Note that to install it you will need both libxml2and libxslt
installed and run "python setup.py build install" in themodule tree.</li>
</ul><p>The distribution includes a set of examples and regression tests for
thepython bindings in the <code>python/tests</code>directory. Here are
someexcepts from those tests:</p><h3>basic.py:</h3><p>This is a basic test of XSLT interfaces: loading a stylesheet and
adocument, transforming the document and saving the result.</p><pre>import libxml2
<a href="tutorial2/libxslt_pipes.html">Tutorial2</a></li><li><a href="xsltproc.html">Man page for xsltproc</a></li><li><a href="http://mail.gnome.org/archives/xslt/">Mail archive</a></li><li><a href="http://xmlsoft.org/">XML libxml2</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.explain.com.au/oss/libxml2xslt.html">MacOsX binaries</a></li><li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxslt">Bug Tracker</a></li><li><a href="http://www.zend.com/php5/articles/php5-xmlphp.php#Heading17">XSLT with PHP</a></li><li><a href="http://www.mod-xslt2.com/">Apache module</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://xsldbg.sourceforge.net/">Xsldbg Debugger</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>API Indexes</b></center></td></tr><tr><td bgcolor="#fffacd"><ul><li><a href="APIchunk0.html">Alphabetic</a></li><li><a href="APIconstructors.html">Constructors</a></li><li><a href="APIfunctions.html">Functions/Types</a></li><li><a href="APIfiles.html">Modules</a></li><li><a href="APIsymbols.html">Symbols</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>There is a number of language bindings and wrappers available for libxml2,
the list below is not exhaustive. Please contact the <a href="http://mail.gnome.org/mailman/listinfo/xml-bindings">xml-bindings@gnome.org</a>
(<a href="http://mail.gnome.org/archives/xml-bindings/">archives</a>) in
order to get updates to this list or to discuss the specific topic of libxml2
or libxslt wrappers or bindings:</p><ul><li><a href="http://mail.gnome.org/archives/xml/2001-March/msg00014.html">Matt
Sergeant</a> developped <a href="http://axkit.org/download/">XML::LibXML
and XML::LibXSLT</a>, Perl wrappers for libxml2/libxslt as part of the <a href="http://axkit.com/">AxKit XML application server</a></li>
<li><a href="mailto:dkuhlman@cutter.rexx.com">Dave Kuhlman</a> provides and
earlier version of the libxml/libxslt <a href="http://www.rexx.com/~dkuhlman">wrappers for Python</a></li>
<li>Petr Kozelka provides <a href="http://sourceforge.net/projects/libxml2-pas">Pascal units to glue
libxml2</a> with Kylix, Delphi and other Pascal compilers</li>
<li>Wai-Sun "Squidster" Chia provides <a href="http://www.rubycolor.org/arc/redist/">bindings for Ruby</a> and
libxml2 bindings are also available in Ruby through the <a href="http://libgdome-ruby.berlios.de/">libgdome-ruby</a> module
maintained by Tobias Peters.</li>
<li>Steve Ball and contributors maintains <a href="http://tclxml.sourceforge.net/">libxml2 and libxslt bindings for
Tcl</a></li>
<li><a href="mailto:xmlwrapp@pmade.org">Peter Jones</a> maintains C++
bindings for libxslt within <a href="http://pmade.org/pjones/software/xmlwrapp/">xmlwrapp</a></li>
<li><a href="phillim2@comcast.net">Mike Phillips</a> provides a module
using <a href="http://siasl.dyndns.org/projects/projects.html">libxslt
for PHP</a>.</li>
<li><a href="http://savannah.gnu.org/projects/classpathx/">LibxmlJ</a> is
an effort to create a 100% JAXP-compatible Java wrapper for libxml2 and
libxslt as part of GNU ClasspathX project.</li>
<li>Patrick McPhee provides Rexx bindings fof libxml2 and libxslt, look for
<a href="http://www.interlog.com/~ptjm/software.html">RexxXML</a>.</li>
<li><a href="http://www.satimage.fr/software/en/xml_suite.html">Satimage</a>
provides <a href="http://www.satimage.fr/software/en/downloads_osaxen.html">XMLLib
osax</a>. This is an osax for Mac OS X with a set of commands to
implement in AppleScript the XML DOM, XPATH and XSLT.</li>
</ul><p>The libxslt Python module depends on the <a href="http://xmlsoft.org/python.html">libxml2 Python</a> module.</p><p>The distribution includes a set of Python bindings, which are garanteed to
be maintained as part of the library in the future, though the Python
interface have not yet reached the completeness of the C API.</p><p><a href="mailto:stephane.bidoul@softwareag.com">St<EFBFBD>phane Bidoul</a>
maintains <a href="http://users.skynet.be/sbi/libxml-python/">a Windows port
of the Python bindings</a>.</p><p>Note to people interested in building bindings, the API is formalized as
<a href="libxslt-api.xml">an XML API description file</a> which allows to
automate a large part of the Python bindings, this includes function
descriptions, enums, structures, typedefs, etc... The Python script used to
build the bindings is python/generator.py in the source distribution.</p><p>To install the Python bindings there are 2 options:</p><ul><li>If you use an RPM based distribution, simply install the <a href="http://rpmfind.net/linux/rpm2html/search.php?query=libxml2-python">libxml2-python
RPM</a> and the <a href="http://rpmfind.net/linux/rpm2html/search.php?query=libxslt-python">libxslt-python
RPM</a>.</li>
<li>Otherwise use the <a href="ftp://xmlsoft.org/libxml2/python/">libxml2-python
module distribution</a> corresponding to your installed version of
libxml2 and libxslt. Note that to install it you will need both libxml2
and libxslt installed and run "python setup.py build install" in the
module tree.</li>
</ul><p>The distribution includes a set of examples and regression tests for the
python bindings in the <code>python/tests</code> directory. Here are some
excepts from those tests:</p><h3>basic.py:</h3><p>This is a basic test of XSLT interfaces: loading a stylesheet and a
document, transforming the document and saving the result.</p><pre>import libxml2
import libxslt
styledoc = libxml2.parseFile("test.xsl")
@ -63,28 +67,28 @@ result = style.applyStylesheet(doc, None)
style.saveResultToFilename("foo", result, 0)
style.freeStylesheet()
doc.freeDoc()
result.freeDoc()</pre><p>The Python module is called libxslt, you will also need the libxml2
modulefor the operations on XML trees. Let's have a look at the objects
manipulatedin that example and how is the processing done:</p><ul><li><code>styledoc</code>: is a libxml2 document tree. It is obtained
byparsing the XML file "test.xsl" containing the stylesheet.</li>
<li><code>style</code>: this is a precompiled stylesheet ready to be usedby
the following transformations (note the plural form,
multipletransformations can resuse the same stylesheet).</li>
<li><code>doc</code>: this is the document to apply the transformation
to.In this case it is simply generated by parsing it from a file but
anyother processing is possible as long as one get a libxml2 Doc. Note
thatHTML tree are suitable for XSLT processing in libxslt. This is
actuallyhow this page is generated !</li>
<li><code>result</code>: this is a document generated by applying
thestylesheet to the document. Note that some of the stylesheet
informationsmay be related to the serialization of that document and as
in thisexample a specific saveResultToFilename() method of the stylesheet
shouldbe used to save it to a file (in that case to "foo").</li>
</ul><p>Also note the need to explicitely deallocate documents with
freeDoc()except for the stylesheet document which is freed when its compiled
form isgarbage collected.</p><h3>extfunc.py:</h3><p>This one is a far more complex test. It shows how to modify the
behaviourof an XSLT transformation by passing parameters and how to extend
the XSLTengine with functions defined in python:</p><pre>import libxml2
result.freeDoc()</pre><p>The Python module is called libxslt, you will also need the libxml2 module
for the operations on XML trees. Let's have a look at the objects manipulated
in that example and how is the processing done:</p><ul><li><code>styledoc</code> : is a libxml2 document tree. It is obtained by
parsing the XML file "test.xsl" containing the stylesheet.</li>
<li><code>style</code> : this is a precompiled stylesheet ready to be used
by the following transformations (note the plural form, multiple
transformations can resuse the same stylesheet).</li>
<li><code>doc</code> : this is the document to apply the transformation to.
In this case it is simply generated by parsing it from a file but any
other processing is possible as long as one get a libxml2 Doc. Note that
HTML tree are suitable for XSLT processing in libxslt. This is actually
how this page is generated !</li>
<li><code>result</code> : this is a document generated by applying the
stylesheet to the document. Note that some of the stylesheet informations
may be related to the serialization of that document and as in this
example a specific saveResultToFilename() method of the stylesheet should
be used to save it to a file (in that case to "foo").</li>
</ul><p>Also note the need to explicitely deallocate documents with freeDoc()
except for the stylesheet document which is freed when its compiled form is
garbage collected.</p><h3>extfunc.py:</h3><p>This one is a far more complex test. It shows how to modify the behaviour
of an XSLT transformation by passing parameters and how to extend the XSLT
engine with functions defined in python:</p><pre>import libxml2
import libxslt
import string
@ -105,20 +109,20 @@ def f(ctx, str):
return string.upper(str)
libxslt.registerExtModuleFunction("foo", "http://example.com/foo", f)</pre><p>This code defines and register an extension function. Note that
thefunction can be bound to any name (foo) and how the binding is
alsoassociated to a namespace name "http://example.com/foo". From an XSLT
pointof view the function just returns an upper case version of the string
passedas a parameter. But the first part of the function also read some
contextualinformation from the current XSLT processing environement, in that
case itlooks for the current insertion node in the resulting output (either
theresulting document or the Result Value Tree being generated), and saves it
toa global variable for checking that the access actually worked.</p><p>For more informations on the xpathParserContext and
transformContextobjects check the <a href="internals.html">libray internals
description</a>.The pctxt is actually an object from a class derived from
thelibxml2.xpathParserContext() with just a couple more properties including
thepossibility to look up the XSLT transformation context from the
XPathcontext.</p><pre>styledoc = libxml2.parseDoc("""
libxslt.registerExtModuleFunction("foo", "http://example.com/foo", f)</pre><p>This code defines and register an extension function. Note that the
function can be bound to any name (foo) and how the binding is also
associated to a namespace name "http://example.com/foo". From an XSLT point
of view the function just returns an upper case version of the string passed
as a parameter. But the first part of the function also read some contextual
information from the current XSLT processing environement, in that case it
looks for the current insertion node in the resulting output (either the
resulting document or the Result Value Tree being generated), and saves it to
a global variable for checking that the access actually worked.</p><p>For more informations on the xpathParserContext and transformContext
objects check the <a href="internals.html">libray internals description</a>.
The pctxt is actually an object from a class derived from the
libxml2.xpathParserContext() with just a couple more properties including the
possibility to look up the XSLT transformation context from the XPath
context.</p><pre>styledoc = libxml2.parseDoc("""
&lt;xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'
xmlns:foo='http://example.com/foo'
@ -129,21 +133,21 @@ XPathcontext.</p><pre>styledoc = libxml2.parseDoc("""
&lt;article&gt;&lt;xsl:value-of select='foo:foo($bar)'/&gt;&lt;/article&gt;
&lt;/xsl:template&gt;
&lt;/xsl:stylesheet&gt;
""")</pre><p>Here is a simple example of how to read an XML document from a
pythonstring with libxml2. Note how this stylesheet:</p><ul><li>Uses a global parameter <code>bar</code></li>
""")</pre><p>Here is a simple example of how to read an XML document from a python
string with libxml2. Note how this stylesheet:</p><ul><li>Uses a global parameter <code>bar</code></li>
<li>Reference the extension function f</li>
<li>how the Namespace name "http://example.com/foo" has to be bound to
aprefix</li>
<li>how the Namespace name "http://example.com/foo" has to be bound to a
prefix</li>
<li>how that prefix is excluded from the output</li>
<li>how the function is called from the select</li>
</ul><pre>style = libxslt.parseStylesheetDoc(styledoc)
doc = libxml2.parseDoc("&lt;doc/&gt;")
result = style.applyStylesheet(doc, { "bar": "'success'" })
style.freeStylesheet()
doc.freeDoc()</pre><p>that part is identical, to the basic example except that thetransformation
is passed a dictionnary of parameters. Note that the stringpassed "success"
had to be quoted, otherwise it is interpreted as an XPathquery for the childs
of root named "success".</p><pre>root = result.children
doc.freeDoc()</pre><p>that part is identical, to the basic example except that the
transformation is passed a dictionnary of parameters. Note that the string
passed "success" had to be quoted, otherwise it is interpreted as an XPath
query for the childs of root named "success".</p><pre>root = result.children
if root.name != "article":
print "Unexpected root node name"
sys.exit(1)
@ -154,14 +158,12 @@ if nodeName != 'article':
print "The function callback failed to access its context"
sys.exit(1)
result.freeDoc()</pre><p>That part just verifies that the transformation worked, that the
parametergot properly passed to the engine, that the function f() got called
and thatit properly accessed the context to find the name of the insertion
node.</p><h3>pyxsltproc.py:</h3><p>this module is a bit too long to be described there but it is basically
arewrite of the xsltproc command line interface of libxslt in Python.
Itprovides nearly all the functionalities of xsltproc and can be used as a
basemodule to write Python customized XSLT processors. One of the thing to
noticeare:</p><pre>libxml2.lineNumbersDefault(1)
libxml2.substituteEntitiesDefault(1)</pre><p>those two calls in the main() function are needed to force the
libxml2processor to generate DOM trees compliant with the XPath data
model.</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>
result.freeDoc()</pre><p>That part just verifies that the transformation worked, that the parameter
got properly passed to the engine, that the function f() got called and that
it properly accessed the context to find the name of the insertion node.</p><h3>pyxsltproc.py:</h3><p>this module is a bit too long to be described there but it is basically a
rewrite of the xsltproc command line interface of libxslt in Python. It
provides nearly all the functionalities of xsltproc and can be used as a base
module to write Python customized XSLT processors. One of the thing to notice
are:</p><pre>libxml2.lineNumbersDefault(1)
libxml2.substituteEntitiesDefault(1)</pre><p>those two calls in the main() function are needed to force the libxml2
processor to generate DOM trees compliant with the XPath data model.</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>