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13<title>The SAX interface</title>
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21<h1>The XML C library for Gnome</h1>
22<h2>The SAX interface</h2>
23</td></tr></table></td></tr></table></td>
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Daniel Veillardc9484202001-10-24 12:35:52 +0000[diff] [blame]41<li><a href="tree.html">The tree output</a></li>
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75<p>Sometimes the DOM tree output is just too large to fit reasonably into
76memory. In that case (and if you don't expect to save back the XML document
77loaded using libxml), it's better to use the SAX interface of libxml. SAX is
78a <strong>callback-based interface</strong> to the parser. Before parsing,
79the application layer registers a customized set of callbacks which are
80called by the library as it progresses through the XML input.</p>
81<p>To get more detailed step-by-step guidance on using the SAX interface of
82libxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
83documentation</a>.written by <a href="mailto:james@daa.com.au">James
84Henstridge</a>.</p>
85<p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
86program located in the gnome-xml module (it's usually not shipped in the
87binary packages of libxml, but you can find it in the tar source
88distribution). Here is the sequence of callbacks that would be reported by
89testSAX when parsing the example XML document shown earlier:</p>
90<pre>SAX.setDocumentLocator()
91SAX.startDocument()
92SAX.getEntity(amp)
93SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp;amp; linux too')
94SAX.characters( , 3)
95SAX.startElement(head)
96SAX.characters( , 4)
97SAX.startElement(title)
98SAX.characters(Welcome to Gnome, 16)
99SAX.endElement(title)
100SAX.characters( , 3)
101SAX.endElement(head)
102SAX.characters( , 3)
103SAX.startElement(chapter)
104SAX.characters( , 4)
105SAX.startElement(title)
106SAX.characters(The Linux adventure, 19)
107SAX.endElement(title)
108SAX.characters( , 4)
109SAX.startElement(p)
110SAX.characters(bla bla bla ..., 15)
111SAX.endElement(p)
112SAX.characters( , 4)
113SAX.startElement(image, href='linus.gif')
114SAX.endElement(image)
115SAX.characters( , 4)
116SAX.startElement(p)
117SAX.characters(..., 3)
118SAX.endElement(p)
119SAX.characters( , 3)
120SAX.endElement(chapter)
121SAX.characters( , 1)
122SAX.endElement(EXAMPLE)
123SAX.endDocument()</pre>
124<p>Most of the other interfaces of libxml are based on the DOM tree-building
125facility, so nearly everything up to the end of this document presupposes the
126use of the standard DOM tree build. Note that the DOM tree itself is built by
127a set of registered default callbacks, without internal specific
128interface.</p>
129<p><a href="mailto:daniel@veillard.com">Daniel Veillard</a></p>
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