**Defined in ontology: Slot-constraint-sugar****Source pathname: /tmp_mnt/vol/q/htw/cms/ontolingua/examples/ontolingua/../../all-ontologies/ontolingua/slot-constraint-sugar.lisp**

**Instance-Of:**Binary-Relation, Relation,*Set***Arity:**2**Documentation:**Binary relation R HAS-SOME values on domain instance i if there exists at least one value v such that R(i,v) holds.

When used in the definition of a class where ?i is the instance variable, (HAS-SOME ?i R) means that the slot R must always have a value when applied to instance of that class.

(<=> (Has-Some ?Instance ?Binary-Relation) (Has-At-Least ?Instance ?Binary-Relation 1))