ASSIGNED-TIME_RANGE returns a time range to which a job is assigned.
(Slot-Cardinality ?Class Assigned-Time-Range 1) (<=> (Temporally-Fixed-Job-Class ?Class) (And (Class ?Class) (Subclass-Of ?Class Job) (Slot-Cardinality ?Class Assigned-Time-Range 1))) (=> (Assigned-Time-Range $X $Y) (Jat-Time-Range $Y)) (=> (Assigned-Time-Range $X $Y) (Job $X))