|E28-CIDOC - This class comprises non-material products of our minds, in order to allow for reasoning about their identity, circumstances of creation and historical implications.
++Philosurfical: Refers-to-concept of type type has been removed. Instead an additional slot is required called refers-to-crm-meta-entity to allow concepts such as classes to be referred to. Refers-to has been written as refers-to-crm-entity. This is used to refer to anything in the CRM knowledge base. The subclass -language- has been taken away, and put under form-of-expression.
Class(CONCEPTUAL-OBJECT partial MAN-MADE-THING
Class Description/Definition (Necessary Conditions)