Issue 68: How to model isA relations between types
In the light of formalizing better the relation between Types and CRM Entities, and modelling the events of inventing classification terms and systems, the definition of a property in the CRM that expresses isA semantics as the ISO2788 "BTG" relationship seems to be useful. Other relationships used for thesauri, like RT, UF etc, do not have the same relevance for the kind of reasoning the CRM intends to support.
Introduction of a new property with "BTG" semantics:
has broader term (has narrower term): E55 Type
Proposal accepted, Monterey 22/2/2002.