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Schemas and the open world assumption.

Hello everyone.

Sorry to be 5 years late, but it is just today that I question myself
about derivation by extension and closed world assumption.

Please do not hesitate to comment the following points:

If I define "a" as being a sequence of b,c:

and i extend "a" into "aa" that extends that sequence with d:

then any "aa" will not validate against the definition of "a".
this sounds like a MAJOR difference with OO paradigm (where any "aa" is
also a "a").

that is what i call the closed world assumption in xml validation.

considering i need a more open world approach, i plan
to relax my schema by defining "a" in this way:

then i feel like i could extend my "a" definition  without breaking
the "subclass" philosophy.

can anyone comment that point of view?
i am especially interested in possible pitfalls i could have missed in
using the "any" statement.
i am also interested in best practices when defining modular expandable models.

any help is very welcome.

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