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Daniel Veillard1177ca42003-04-26 22:29:54 +0000[diff] [blame]1<?xml version="1.0" encoding="ISO-8859-1"?>
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Daniel Veillard373a4752002-02-21 14:46:29 +0000[diff] [blame]4TD {font-family: Verdana,Arial,Helvetica}
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Daniel Veillardf781dba2006-06-09 13:34:49 +0000[diff] [blame]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" 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href="xml.html">flat page</a>, <a href="site.xsl">stylesheet</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><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://www.blastwave.org/packages.php/libxml2">Solaris binaries</a></li><li><a href="http://www.explain.com.au/oss/libxml2xslt.html">MacOsX binaries</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
11memory. In that case (and if you don't expect to save back the XML document
12loaded using libxml), it's better to use the SAX interface of libxml. SAX is
13a <strong>callback-based interface</strong> to the parser. Before parsing,
14the application layer registers a customized set of callbacks which are
15called 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
16libxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
17documentation</a>.written by <a href="mailto:james@daa.com.au">James
18Henstridge</a>.</p><p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
19program located in the gnome-xml module (it's usually not shipped in the
20binary packages of libxml, but you can find it in the tar source
21distribution). Here is the sequence of callbacks that would be reported by
22testSAX when parsing the example XML document shown earlier:</p><pre>SAX.setDocumentLocator()
Daniel Veillardc9484202001-10-24 12:35:52 +0000[diff] [blame]23SAX.startDocument()
24SAX.getEntity(amp)
25SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp;amp; linux too')
26SAX.characters( , 3)
27SAX.startElement(head)
28SAX.characters( , 4)
29SAX.startElement(title)
30SAX.characters(Welcome to Gnome, 16)
31SAX.endElement(title)
32SAX.characters( , 3)
33SAX.endElement(head)
34SAX.characters( , 3)
35SAX.startElement(chapter)
36SAX.characters( , 4)
37SAX.startElement(title)
38SAX.characters(The Linux adventure, 19)
39SAX.endElement(title)
40SAX.characters( , 4)
41SAX.startElement(p)
42SAX.characters(bla bla bla ..., 15)
43SAX.endElement(p)
44SAX.characters( , 4)
45SAX.startElement(image, href='linus.gif')
46SAX.endElement(image)
47SAX.characters( , 4)
48SAX.startElement(p)
49SAX.characters(..., 3)
50SAX.endElement(p)
51SAX.characters( , 3)
52SAX.endElement(chapter)
53SAX.characters( , 1)
54SAX.endElement(EXAMPLE)
Daniel Veillardf781dba2006-06-09 13:34:49 +0000[diff] [blame]55SAX.endDocument()</pre><p>Most of the other interfaces of libxml2 are based on the DOM tree-building
56facility, so nearly everything up to the end of this document presupposes the
57use of the standard DOM tree build. Note that the DOM tree itself is built by
58a set of registered default callbacks, without internal specific
59interface.</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>