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components/expat: add expat library description

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add XML instruction, see expat file.
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liuhan 2016-09-26 20:44:42 +08:00 committed by Wu Jian Gang
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The Expat XML Parse Instruction
=============================
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 four function as follows:
*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 will show them on http://expat.sourceforge.net
An introductory article on using Expat is available on http://xml.com