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Understanding XML Programming in Java: DOM, SAX, and More

This document explores XML programming in Java, focusing on key standard APIs like DOM and SAX. The Document Object Model (DOM) provides a generic tree model defined by W3C, allowing full document navigation and editing. In contrast, Simple API for XML (SAX) offers a streaming model, notifying applications with event-driven updates. The text covers the pros and cons of both DOM and SAX, detailing their architecture and usability, along with links to official specifications. A comprehensive guide for Java developers working with XML.

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Understanding XML Programming in Java: DOM, SAX, and More

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Presentation Transcript

  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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