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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>
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86<p>Sometimes the DOM tree output is just too large to fit reasonably into
87memory. In that case (and if you don't expect to save back the XML document
88loaded using libxml), it's better to use the SAX interface of libxml. SAX is
89a <strong>callback-based interface</strong> to the parser. Before parsing,
90the application layer registers a customized set of callbacks which are
91called by the library as it progresses through the XML input.</p>
92<p>To get more detailed step-by-step guidance on using the SAX interface of
93libxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice
94documentation</a>.written by <a href="mailto:james@daa.com.au">James
95Henstridge</a>.</p>
96<p>You can debug the SAX behaviour by using the <strong>testSAX</strong>
97program located in the gnome-xml module (it's usually not shipped in the
98binary packages of libxml, but you can find it in the tar source
99distribution). Here is the sequence of callbacks that would be reported by
100testSAX when parsing the example XML document shown earlier:</p>
101<pre>SAX.setDocumentLocator()
102SAX.startDocument()
103SAX.getEntity(amp)
104SAX.startElement(EXAMPLE, prop1='gnome is great', prop2='&amp;amp; linux too')
105SAX.characters( , 3)
106SAX.startElement(head)
107SAX.characters( , 4)
108SAX.startElement(title)
109SAX.characters(Welcome to Gnome, 16)
110SAX.endElement(title)
111SAX.characters( , 3)
112SAX.endElement(head)
113SAX.characters( , 3)
114SAX.startElement(chapter)
115SAX.characters( , 4)
116SAX.startElement(title)
117SAX.characters(The Linux adventure, 19)
118SAX.endElement(title)
119SAX.characters( , 4)
120SAX.startElement(p)
121SAX.characters(bla bla bla ..., 15)
122SAX.endElement(p)
123SAX.characters( , 4)
124SAX.startElement(image, href='linus.gif')
125SAX.endElement(image)
126SAX.characters( , 4)
127SAX.startElement(p)
128SAX.characters(..., 3)
129SAX.endElement(p)
130SAX.characters( , 3)
131SAX.endElement(chapter)
132SAX.characters( , 1)
133SAX.endElement(EXAMPLE)
134SAX.endDocument()</pre>
135<p>Most of the other interfaces of libxml are based on the DOM tree-building
136facility, so nearly everything up to the end of this document presupposes the
137use of the standard DOM tree build. Note that the DOM tree itself is built by
138a set of registered default callbacks, without internal specific
139interface.</p>
Daniel Veillard3f4c40f2002-02-13 09:19:28 +0000[diff] [blame]140<p><a href="bugs.html">Daniel Veillard</a></p>
Daniel Veillardc9484202001-10-24 12:35:52 +0000[diff] [blame]141</td></tr></table></td></tr></table></td></tr></table></td>
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