Reuters
Henry S. Thompson
XML Schema, London 1999-12-15
32
Where are we headed?
nA number of design decisions can now be stated:
nShould 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?
nThe new proposal says 'yes', you do this by using the "source" and "derivedBy" attributes on your <type> or <datatype> element.