| http://www.w3.org/ns/prov#value | - The data structure representing a given type relation preferably includes the following data members: one or e subject object type identifiers???object type identifiers (or keys or pointers) that identify one or more types of subject objects of the given type relation; one or more direct object type identifiers???object type identifiers (or keys or pointers) that identify one or more types, of dir
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