A class C HAS-SLOT-VALUE v of relation R if for every instance i of C, R(i,v).
(Nth-Domain Has-Slot-Value 2 Binary-Relation)
(Nth-Domain Has-Slot-Value 1 Class)
(<=> (Has-Slot-Value ?Class ?Binary-Relation ?Slot-Value)
(And (Class ?Class)
(Binary-Relation ?Binary-Relation)
(=> (Instance-Of ?Instance ?Class)
(Holds ?Binary-Relation ?Instance ?Slot-Value))))