[dsdl-discuss] Schemas: "is" or "ought"

There is an interesting discussion in another place on whether (or at what times)
schema languages specify "necessarily is" or "ought-to-be".

In the "is" interpretation of a schema (e.g X is a Y) would be used by
interface generators which assume validity.

The "ought-to-be" interpretation (e.g. X ought to be a Y) would be used
by validators.

ISO DSDL, at least the visible/prospective parts of it so far (RELAX NG,
Schematron), really only concerned with "ought-to-be"?

What is our story on this?

Cheers
Rick Jelliffe

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