subclass | Class | Class | singleValued | Class C is a subclass of Class P only if every instance of C is also an instance of P. A class may have multiple superclasses and subclasses | (=> (instance ?OBJ CorpuscularObject) (exists (?SUBSTANCETYPE1 ?SUBSTANCETYPE2 ?SUBSTANCE1 ?SUBSTANCE2) (and (subclass ?SUBSTANCETYPE1 Substance) (subclass ?SUBSTANCETYPE2 Substance) (instance ?SUBSTANCE1 ?SUBSTANCETYPE1) (instance ?SUBSTANCE2 ?SUBSTANCETYPE2) (material ?SUBSTANCE1 ?OBJ) (material ?SUBSTANCE2 ?OBJ) (not (equal ?SUBSTANCE1 ?SUBSTANCE2)))))
| | PartialOrderingRelation |