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</style><title>Python and bindings</title></head><bodybgcolor="#8b7765"text="#000000"link="#a06060"vlink="#000000"><tableborder="0"width="100%"cellpadding="5"cellspacing="0"align="center"><tr><tdwidth="120"><ahref="http://swpat.ffii.org/"><imgsrc="epatents.png"alt="Action against software patents"/></a></td><tdwidth="180"><ahref="http://www.gnome.org/"><imgsrc="gnome2.png"alt="Gnome2 Logo"/></a><ahref="http://www.w3.org/Status"><imgsrc="w3c.png"alt="W3C Logo"/></a><ahref="http://www.redhat.com/"><imgsrc="redhat.gif"alt="Red Hat Logo"/></a><divalign="left"><ahref="http://xmlsoft.org/"><imgsrc="Libxml2-Logo-180x168.gif"alt="Made with Libxml2 Logo"/></a></div></td><td><tableborder="0"width="90%"cellpadding="2"cellspacing="0"align="center"bgcolor="#000000"><tr><td><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"bgcolor="#fffacd"><tr><tdalign="center"><h1>The XML C parser and toolkit of Gnome</h1><h2>Python and bindings</h2></td></tr></table></td></tr></table></td></tr></table><tableborder="0"cellpadding="4"cellspacing="0"width="100%"align="center"><tr><tdbgcolor="#8b7765"><tableborder="0"cellspacing="0"cellpadding="2"width="100%"><tr><tdvalign="top"width="200"bgcolor="#8b7765"><tableborder="0"cellspacing="0"cellpadding="1"width="100%"bgcolor="#000000"><tr><td><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>Developer Menu</b></center></td></tr><tr><tdbgcolor="#fffacd"><formaction="search.php"enctype="application/x-www-form-urlencoded"method="get"><inputname="query"type="text"size="20"value=""/><inputname="submit"type="submit"value="Search ..."/></form><ul><li><ahref="index.html"style="font-weight:bold">Main Menu</a></li><li><ahref="html/index.html"style="font-weight:bold">Reference Manual</a></li><li><ahref="examples/index.html"style="font-weight:bold">Code Examples</a></li><li><ahref="guidelines.html">XML Guidelines</a></li><li><ahref="tutorial/index.html">Tutorial</a></li><li><ahref="xmlreader.html">The Reader Interface</a></li><li><ahref="ChangeLog.html">ChangeLog</a></li><li><ahref="XSLT.html">XSLT</a></li><li><ahref="python.html">Python and bindings</a></li><li><ahref="architecture.html">libxml2 architecture</a></li><li><ahref="tree.html">The tree output</a></li><li><ahref="interface.html">The SAX interface</a></li><li><ahref="xmlmem.html">Memory Management</a></li><li><ahref="xmlio.html">I/O Interfaces</a></li><li><ahref="library.html">The parser interfaces</a></li><li><ahref="entities.html">Entities or no entities</a></li><li><ahref="namespaces.html">Namespaces</a></li><li><ahref="upgrade.html">Upgrading 1.x code</a></li><li><ahref="threads.html">Thread safety</a></li><li><ahref="DOM.html">DOM Principles</a></li><li><ahref="example.html">A real example</a></li><li><ahref="xml.html">flat page</a>, <ahref="site.xsl">stylesheet</a></li></ul></td></tr></table><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>API Indexes</b></center></td></tr><tr><tdbgcolor="#fffacd"><ul><li><ahref="APIchunk0.html">Alphabetic</a></li><li><ahref="APIconstructors.html">Constructors</a></li><li><ahref="APIfunctions.html">Functions/Types</a></li><li><ahref="APIfiles.html">Modules</a></li><li><ahref="APIsymbols.html">Symbols</a></li></ul></td></tr></table><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>Related links</b></center></td></tr><tr><tdbgcolor="#fffacd"><ul><li><ahref="http://mail.gnome.org/archives/xml/">Mail archive</a></li><li><ahref="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li><li><ahref="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li><li><ahref="http://www.aleksey.com/xmlsec/">XML-DSig xmlsec</a></li><li><ahref="ftp://xmlsoft.org/">FTP</a></li><li><ahref="http://www.zlatkovic.com/projects/libxml/">Windows binaries</a></li><li><ahref="http://opencsw.org/packages/libxml2">
ctxt.xpathFreeContext()</pre><p>This test parses a file, then create an XPath context to evaluate XPath
expression on it. The xpathEval() method execute an XPath query and returns
the result mapped in a Python way. String and numbers are natively converted,
and node sets are returned as a tuple of libxml2 Python nodes wrappers. Like
the document, the XPath context need to be freed explicitly, also not that
the result of the XPath query may point back to the document tree and hence
the document must be freed after the result of the query is used.</p><h3>xpathext.py:</h3><p>This test shows how to extend the XPath engine with functions written in
ctxt.xpathFreeContext()</pre><p>Note how the extension function is registered with the context (but that
part is not yet finalized, this may change slightly in the future).</p><h3>tstxpath.py:</h3><p>This test is similar to the previous one but shows how the extension
function can access the XPath evaluation context:</p><pre>def foo(ctx, x):
libxml2.dumpMemory()</pre><p>Those activate the memory debugging interface of libxml2 where all
allocated block in the library are tracked. The prologue then cleans up the
library state and checks that all allocated memory has been freed. If not it
calls dumpMemory() which saves that list in a <code>.memdump</code> file.</p><p><ahref="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html>
