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| 10 | </style><title>The SAX interface</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/"><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 parser and toolkit of Gnome</h1><h2>The SAX interface</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>Developer 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" style="font-weight:bold">Main Menu</a></li><li><a href="html/index.html" style="font-weight:bold">Reference Manual</a></li><li><a href="examples/index.html" style="font-weight:bold">Code 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href="ftp://xmlsoft.org/">FTP</a></li><li><a href="http://www.zlatkovic.com/projects/libxml/">Windows binaries</a></li><li><a href="http://opencsw.org/packages/libxml2">Solaris binaries</a></li><li><a href="http://www.explain.com.au/oss/libxml2xslt.html">MacOsX binaries</a></li><li><a href="http://lxml.de/">lxml Python bindings</a></li><li><a href="http://cpan.uwinnipeg.ca/dist/XML-LibXML">Perl bindings</a></li><li><a href="http://libxmlplusplus.sourceforge.net/">C++ bindings</a></li><li><a href="http://www.zend.com/php5/articles/php5-xmlphp.php#Heading4">PHP bindings</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://libxml.rubyforge.org/">Ruby bindings</a></li><li><a href="http://tclxml.sourceforge.net/">Tcl bindings</a></li><li><a href="http://bugzilla.gnome.org/buglist.cgi?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>Sometimes the DOM tree output is just too large to fit reasonably into
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| 11 | memory. In that case (and if you don't expect to save back the XML document
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| 12 | loaded using libxml), it's better to use the SAX interface of libxml. SAX is
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| 13 | a <strong>callback-based interface</strong> to the parser. Before parsing,
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| 14 | the application layer registers a customized set of callbacks which are
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| 15 | called by the library as it progresses through the XML input.</p><p>To get more detailed step-by-step guidance on using the SAX interface of
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| 16 | libxml, see the <a href="http://www.jamesh.id.au/articles/libxml-sax/libxml-sax.html">nice
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| 17 | documentation</a>.written by <a href="mailto:[email protected]">James
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| 18 | Henstridge</a>.</p><p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
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| 19 | program located in the gnome-xml module (it's usually not shipped in the
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| 20 | binary packages of libxml, but you can find it in the tar source
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| 21 | distribution). Here is the sequence of callbacks that would be reported by
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| 22 | testSAX when parsing the example XML document shown earlier:</p><pre>SAX.setDocumentLocator()
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| 23 | SAX.startDocument()
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| 24 | SAX.getEntity(amp)
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| 25 | SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too')
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| 26 | SAX.characters( , 3)
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| 27 | SAX.startElement(head)
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| 28 | SAX.characters( , 4)
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| 29 | SAX.startElement(title)
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| 30 | SAX.characters(Welcome to Gnome, 16)
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| 31 | SAX.endElement(title)
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| 32 | SAX.characters( , 3)
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| 33 | SAX.endElement(head)
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| 34 | SAX.characters( , 3)
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| 35 | SAX.startElement(chapter)
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| 36 | SAX.characters( , 4)
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| 37 | SAX.startElement(title)
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| 38 | SAX.characters(The Linux adventure, 19)
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| 39 | SAX.endElement(title)
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| 40 | SAX.characters( , 4)
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| 41 | SAX.startElement(p)
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| 42 | SAX.characters(bla bla bla ..., 15)
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| 43 | SAX.endElement(p)
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| 44 | SAX.characters( , 4)
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| 45 | SAX.startElement(image, href='linus.gif')
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| 46 | SAX.endElement(image)
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| 47 | SAX.characters( , 4)
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| 48 | SAX.startElement(p)
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| 49 | SAX.characters(..., 3)
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| 50 | SAX.endElement(p)
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| 51 | SAX.characters( , 3)
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| 52 | SAX.endElement(chapter)
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| 53 | SAX.characters( , 1)
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| 54 | SAX.endElement(EXAMPLE)
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| 55 | SAX.endDocument()</pre><p>Most of the other interfaces of libxml2 are based on the DOM tree-building
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| 56 | facility, so nearly everything up to the end of this document presupposes the
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| 57 | use of the standard DOM tree build. Note that the DOM tree itself is built by
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| 58 | a set of registered default callbacks, without internal specific
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| 59 | interface.</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>
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