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XML Programming in Java

XML Programming in Java. Andy Clark. Which API?. Standard APIs for XML programming in Java Document Object Model (DOM) Defined by W3C Generic tree model Simple API for XML (SAX) Defined by members of xml-dev mailing list “Event” model Others DOM4J, JDOM, XNI, etc…. DOM Design Premise.

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XML Programming in Java

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  1. XML Programming in Java Andy Clark 17 Apr 2002

  2. Which API? • Standard APIs for XML programming in Java • Document Object Model (DOM) • Defined by W3C • Generic tree model • Simple API for XML (SAX) • Defined by members of xml-dev mailing list • “Event” model • Others • DOM4J, JDOM, XNI, etc…

  3. DOM Design Premise • Derived from browser document model • Defined in IDL • Lowest common denominator programming lang. • Most methods packed into base Node object • Re-invents basic collection interfaces • Factory model • Allows custom classes to be used for nodes • Separation between required and optional modules

  4. DOM Modules • DOM Level 1 • Core (required) • HTML (optional) • DOM Level 2 • Core (required) • Views, Events, Style, Traversal, Range (optional) • DOM Level 3 – working draft • Core (required) • Abstract Schema, Load/Save, Events, XPath (optional)

  5. Pros and Cons of DOM • Pros • Entire document is in memory • Fully navigable and editable structure and content • Recognized standard for XML tree model • Cons • Entire document is in memory • IDL mapping not intuitive to Java programmers

  6. Parent Prev. Sibling Next Sibling First Child Node Last Child Document Object Model • Generic tree model • Node • Type, name, value • Attributes • Parent node • Previous, next sibling nodes • First, last child nodes • Collections • Lists • Maps

  7. SAX Design Premise • Generic method of creating XML parser, parsing documents, and receiving document information • “Streaming” information set • Application registers handlers • Parser “pushes” information to handlers • Serial (“as you see it”) notification • Application only uses information it needs

  8. Pros and Cons of SAX • Pros • Simple API designed for Java • Uses very little memory • Recognized standard for XML event model • Cons • Application forced to do everything

  9. Useful Links • DOM Specification • Level 1: http://www.w3.org/TR/REC-DOM-Level-1 • Level 2: http://www.w3.org/TR/REC-DOM-Level-2 • SAX • http://sax.sourceforge.net/

  10. XML Programming in Java Andy Clark

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