> 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
--
David Megginson ak117@freenet.carleton.ca
Microstar Software Ltd. dmeggins@microstar.com
http://home.sprynet.com/sprynet/dmeggins/
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