Derivation by Restriction

[Fabio Arciniegas A.]

Hi all.
During the definition of a schema for instances product of Object
serialization, I begin to wonder about the implications of derivation
by restriction in XML: Schema when used with OO apps...

Is derivation by restriction necessary/desirable? could anyone
please explain the need behind it a bit? Is D by R a "threat" to
the conformance[1] principle when using schema to define object
hierarchies? 

just oblique thoughts... :) comments?

Fabio


[1] loosely put, the traditional conformance principle in OO states: If B
inherits from A, B can be used wherever A can be used.

--
Fabio Arciniegas A.		        Viaduct Technologies, Inc.
fabio at viaduct.com			         Software Engineer
Interests: XML, Wittgenstein and just about everything in between.
Oblique Strategy of the day: "Feed the recording back out of the medium"

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