SAX2: Exceptions

David Megginson david at
Tue Dec 21 14:22:58 GMT 1999

Now that the Namespace-support discussion is pretty-much wrapped up
(aside from some aesthetic questions), I'd like to move on to the
question of exceptions, which I hope will be considerably less

For SAX2, I'm proposing the following major changes in exceptions:

1. SAXException extends IOException.

2. Add SAXNotRecognizedException, for a feature or property name
   that's not recognized.  Extends SAXException.

3. Add SAXNotSupportedException, for a request that the parser doesn't 
   support.  Extends SAXException.

4. Modify SAXParseException so that it also has an integer value
   containing the error number.  If there ever is a standard catalog
   of XML (and related) errors, we can use this to hold the number.

5. Have all callbacks that formerly threw SAXException throw
   IOException instead.  This should help to avoid a lot of exception

Any issues?  I know that a few people suggested extending
IOException back in the SAX 1.0 design a year and a half ago, and
after doing a lot of implementation on top of SAX, I now agree with

All the best,


David Megginson                 david at

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