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   RE: [xml-dev] Subtyping in XML

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How does one make an abstract type "generous"?

Serious question because of one design I've 
worked on that insists on a primary schema 
with derived secondary schemas.  To me the 
term "generous" resonates with what is to 
be achieved in that design, so I would like 
to understand you more formally.


From: ht@cogsci.ed.ac.uk [mailto:ht@cogsci.ed.ac.uk]

There's a whole rich and interesting topic I think of as "Designing
for Extensibility" wrt W3C XML Schema, and my thinking on this for
some time has been to focus on achieving this via the use of
'generous' abstract types and derivation by restriction, for just the
kind of reasons you cite.


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