R102 - modelint/shlaer-mellor-metamodel GitHub Wiki

Facet is a Superclass or Subclass

These are the only two roles that a Class may play in a Generalization.

Regardless of role, we abstract the concept of a Facet so that we can gather together all roles that must be instantiated to fully represent some real world entity.

<subclass>.(Rnum, Class, Domain) -> Facet.(Rnum, Class, Domain)