Extending DTDs for Backward Compatibility
ak117 at freenet.carleton.ca
Fri Jan 30 15:17:30 GMT 1998
Rick Jelliffe writes:
> The first declaration of an entity has precedence.
> So you can derive a new DTD by merely declaring the new
> element types you need in the internal subset, and then
> defining the appropriate parameter entity.
Absolutely right, but this doesn't solve his other problem -- that
processing software written for the base version of the DTD has to be
able to deal with documents written for the extended version.
All the best,
David Megginson ak117 at freenet.carleton.ca
Microstar Software Ltd. dmeggins at microstar.com
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