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Importance of XML Parsers

Learn why XML parsers are essential, how to check XML syntax, validate with DTD and XML Schema, and utilize SAX or DOM for programmatic access and data processing.

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Importance of XML Parsers

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  1. XML Parser

  2. Why Need a XML Parser ? • Check XML syntax . ( is well-formed ? ) • Validation. ( DTD and XML Schema ) • Allow programmatic access to the document’s content. ( SAX、DOM、… )

  3. SAX vs. DOM • A SAX-based parser processes the document and generates events when tags、text、… are encountered. • A DOM-based parser builds a tree structure containing the XML document’s data in memory.

  4. DOM ( Document Object Model)

  5. DOM ( Document Object Model)

  6. Examples • Creating Nodes. ( BuildXml.java ) • Traversing the DOM. ( TraverseDOM.java )

  7. XML Parser List • Apache Xerces http://xml.apache.org • IBM XML4J http://alphawork.ibm.com/tech/xml4j • Sun Microsystems JAXP http://java.sun.com/xml/ • James Clark XP http://www.jclark.com/xml/xp • Oracle XML Parser http://technet.oracle.com/tech/xml

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