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Where are we headed?
n A number of design decisions can now be
stated:
n Should we make it easy to construct type
definitions which restrict or extend other type
definitions, by specifying only the method of
derivation and the differences between the
source and derived type definitions?
n The new proposal says 'yes', you do this by
using the "source" and "derivedBy"
attributes on your <type> or <datatype>
element.