The Expat XML Parse Instruction
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Expat is an XML parser library written in C which be used for parse XML documents.

It is a stream-oriented parser in which an application registers handlers for things the parser might find in the XML document.
    
It can parse some larger files.
    
-   Expat XML Parser support many different processor, but for the most part function you only need the following functions:

    *XML_ParserCreate:*  Create a new parser object

    *XML_SetElementHandler:*  Set handlers for start and end tags

    *XML_SetCharacterDataHandler:*  Set handler for text

    *XML_Parse:*  Pass a buffer full of document to the parser

More information about Expat library can be found on http://expat.sourceforge.net

An introductory article on using Expat is available on http://xml.com