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| </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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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 |
| intomemory. In that case (and if you don't expect to save back the XML |
| documentloaded using libxml), it's better to use the SAX interface of libxml. |
| SAX isa <strong>callback-based interface</strong>to the parser. Before |
| parsing,the application layer registers a customized set of callbacks which |
| arecalled 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 |
| oflibxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nicedocumentation</a>.written |
| by <a href="mailto:james@daa.com.au">JamesHenstridge</a>.</p><p>You can debug the SAX behaviour by using the |
| <strong>testSAX</strong>program located in the gnome-xml module (it's usually |
| not shipped in thebinary packages of libxml, but you can find it in the tar |
| sourcedistribution). Here is the sequence of callbacks that would be reported |
| bytestSAX when parsing the example XML document shown earlier:</p><pre>SAX.setDocumentLocator() |
| SAX.startDocument() |
| SAX.getEntity(amp) |
| SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp; linux too') |
| SAX.characters( , 3) |
| SAX.startElement(head) |
| SAX.characters( , 4) |
| SAX.startElement(title) |
| SAX.characters(Welcome to Gnome, 16) |
| SAX.endElement(title) |
| SAX.characters( , 3) |
| SAX.endElement(head) |
| SAX.characters( , 3) |
| SAX.startElement(chapter) |
| SAX.characters( , 4) |
| SAX.startElement(title) |
| SAX.characters(The Linux adventure, 19) |
| SAX.endElement(title) |
| SAX.characters( , 4) |
| SAX.startElement(p) |
| SAX.characters(bla bla bla ..., 15) |
| SAX.endElement(p) |
| SAX.characters( , 4) |
| SAX.startElement(image, href='linus.gif') |
| SAX.endElement(image) |
| SAX.characters( , 4) |
| SAX.startElement(p) |
| SAX.characters(..., 3) |
| SAX.endElement(p) |
| SAX.characters( , 3) |
| SAX.endElement(chapter) |
| SAX.characters( , 1) |
| SAX.endElement(EXAMPLE) |
| SAX.endDocument()</pre><p>Most of the other interfaces of libxml2 are based on the DOM |
| tree-buildingfacility, so nearly everything up to the end of this document |
| presupposes theuse of the standard DOM tree build. Note that the DOM tree |
| itself is built bya set of registered default callbacks, without internal |
| specificinterface.</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> |
