ConstraintPropertyType for DependsOn

Comment on current RDF Schemas working draft WD-rdf-schema-19980409.

I cannot see how the value of one property can be constrained,
depending on the value of another property.

This situation is best explained by an example. To specify a contact
person the set of metadata elements would include COUNTRY and STATE.

If the value of COUNTRY is "Australia" then exactly one STATE is
chosen from a controlled list of states. However, if the value of
COUNTRY is "New Zealand" then STATE does not apply.

Is this something that the RDF Schema mechanism should be capable of,
or does this belong solely in the domain of validating parser

David Crossley <>

Received on Thursday, 23 April 1998 01:18:15 UTC