|E70-CIDOC - This general class comprises usable discrete, identifiable, instances of E77 Persistent Item that are documented as single units. They can be either intellectual products or physical things, and are characterized by relative stability. They may for instance either have a solid physical form, an electronic encoding, or they may be logical concept or structure.
++Philosurfical: The Cidoc version we had presented a has-dimension slot at this level, which did not make much sense to us (how to apply it to abstract concepts?) thus we moved it under physical-thing..
Class(THING partial PERSISTENT-ITEM
Class Description/Definition (Necessary Conditions)