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   SAX2: Proposed alternative DTD interface

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  • From: David Megginson <david@megginson.com>
  • To: "XML Developers' List" <xml-dev@ic.ac.uk>
  • Date: Fri, 26 Mar 1999 17:23:28 -0500 (EST)

Here's another alternative for SAX2: forget about trying to report DTD 
declarations as events, and simply make the whole DTD available
through an interface with a Parser2.get() call.

I threw together a quick (read-only) DTD interface this morning, and
uploaded it to the following location


The package consists of the following interfaces (and exception class)
in the org.xml.sax.dtd package:

  Attribute extends DTDComponent
  ContentGroup extends ContentParticle
  ContentToken extends ContentParticle
  DTDException extends java.lang.Exception
  Element extends DTDComponent
  Entity extends DTDComponent
  Notation extends DTDComponent

The interface itself is pretty small -- the compiled class files add
up to just over 4K -- and a SAX application would get the information
like this:

  try {
    DTD dtd = (DTD)parser.get("http://xml.org/sax/props/dtd");
  } catch (SAXNotSupportedException e) {
    // ...

This would print out the names of all of the declared elements:

  DTDComponentIterator it = dtd.getElements();
  while (it.hasMoreMembers()) {

etc., etc.

All the best,


David Megginson                 david@megginson.com

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