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   SAX2: DOM support

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  • From: David Megginson <david@megginson.com>
  • To: XMLDev list <xml-dev@ic.ac.uk>
  • Date: Tue, 18 Jan 2000 09:26:45 -0500 (EST)

We've talked in the past about supplying better DOM support in SAX2
through features and properties.  There are two options:

1. Pull

   Define a read-only 'dom-iterator' feature that tells whether the
   current reader is iterating over a DOM tree or not.  Define a
   read-only 'dom-node' property (valid only during parsing) that
   returns the current DOM node.

   The DOM iterator could either get the root DOM node through its
   constructor (as I imagined), through a magic URI argument to
   parse(), or as David B. suggested, by making the 'dom-node'
   property writable outside of the parse.

2. Push

   Define the 'dom-iterator' feature, and possibly also a 'dom-node'
   property for setting the initial node, but add a 'dom-handler'
   property for an extension handler to report the current DOM node:

   public interface DOMHandler
     startNode (Node node) throws SAXException;
     endNode (Node node) throws SAXException;

   This saves a lot of unnecessary hashtable lookups.

Which of the two do people prefer?

All the best,


David Megginson                 david@megginson.com

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