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can dtds be extended?

• From: Matt Brown <mbrown@i...>
• To: xml-dev@l...
• Date: Wed, 12 Sep 2001 12:02:13 -0700

Hi,
I am using a published DTD (PMML) and need to add attributes to one of the
elements. Is there any way I can do this, ie, extend the DTD in a way such
that I can include extra information for my needs while still conforming to
the published standard? For example, is there any way I can overwrite an
element or attlist in an xml doc with a new one of the same name with more
attributes? Can I reference 2 DTD's an include a smaller "DTD addition" with
my xml? Is there any way to support inheritance in XML?
thanks,
matt

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