concrete extension

From: Peter F. Patel-Schneider ([email protected])
Date: 01/23/01 

Hi:

There are differences between the abstract and concrete relationships that
show up in the syntactic definition.  For example, toClass has a range of
Class, which is different from the range of toDataType.  This indicates
that we would lose something if we used toClass for both abstract and
concrete properties.

peter

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