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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="SHORTCUT ICON" href="/favicon.ico" /><style type="text/css">
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H1 {font-family: Verdana,Arial,Helvetica}
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A:link, A:visited, A:active { text-decoration: underline }
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</style><title>The SAX interface</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"> |    | The XML C parser and toolkit of GnomeThe SAX interface |
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| <center>Developer Menu</center> | | <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> |
| <center>API Indexes</center> | |
| <center>Related links</center> | |
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| Sometimes the DOM tree output is just too large to fit reasonably into |
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memory. In that case (and if you don't expect to save back the XML document
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loaded using libxml), it's better to use the SAX interface of libxml. SAX is
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a callback-based interface to the parser. Before parsing,
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the application layer registers a customized set of callbacks which are
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called by the library as it progresses through the XML input.To get more detailed step-by-step guidance on using the SAX interface of
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libxml, see the nice
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documentation.written by James
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Henstridge.You can debug the SAX behaviour by using the testSAX
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program located in the gnome-xml module (it's usually not shipped in the
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binary packages of libxml, but you can find it in the tar source
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distribution). Here is the sequence of callbacks that would be reported by
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testSAX when parsing the example XML document shown earlier:SAX.setDocumentLocator()
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SAX.startDocument()
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SAX.getEntity(amp)
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SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='& linux too')
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SAX.characters( , 3)
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SAX.startElement(head)
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SAX.characters( , 4)
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SAX.startElement(title)
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SAX.characters(Welcome to Gnome, 16)
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SAX.endElement(title)
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SAX.characters( , 3)
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SAX.endElement(head)
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SAX.characters( , 3)
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SAX.startElement(chapter)
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SAX.characters( , 4)
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SAX.startElement(title)
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SAX.characters(The Linux adventure, 19)
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SAX.endElement(title)
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SAX.characters( , 4)
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SAX.startElement(p)
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SAX.characters(bla bla bla ..., 15)
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SAX.endElement(p)
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SAX.characters( , 4)
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SAX.startElement(image, href='linus.gif')
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SAX.endElement(image)
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SAX.characters( , 4)
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SAX.startElement(p)
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SAX.characters(..., 3)
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SAX.endElement(p)
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SAX.characters( , 3)
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SAX.endElement(chapter)
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SAX.characters( , 1)
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SAX.endElement(EXAMPLE)
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SAX.endDocument()Most of the other interfaces of libxml2 are based on the DOM tree-building
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facility, so nearly everything up to the end of this document presupposes the
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use of the standard DOM tree build. Note that the DOM tree itself is built by
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a set of registered default callbacks, without internal specific
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interface.Daniel Veillard </body></html>
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