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| <h1>The XML C library for Gnome</h1> |
| <h2>The SAX interface</h2> |
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| <p>Sometimes the DOM tree output is just too large to fit reasonably into |
| memory. In that case (and if you don't expect to save back the XML document |
| loaded using libxml), it's better to use the SAX interface of libxml. SAX is |
| a <strong>callback-based interface</strong> to the parser. Before parsing, |
| the application layer registers a customized set of callbacks which are |
| called 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 |
| libxml, see the <a href="http://www.daa.com.au/~james/gnome/xml-sax/xml-sax.html">nice |
| documentation</a>.written by <a href="mailto:james@daa.com.au">James |
| Henstridge</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 the |
| binary packages of libxml, but you can find it in the tar source |
| distribution). Here is the sequence of callbacks that would be reported by |
| testSAX 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 libxml are based on the DOM tree-building |
| facility, so nearly everything up to the end of this document presupposes the |
| use of the standard DOM tree build. Note that the DOM tree itself is built by |
| a set of registered default callbacks, without internal specific |
| interface.</p> |
| <p><a href="bugs.html">Daniel Veillard</a></p> |
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