Deleting Things

All of these operations are non-monotonic, and should only be used with great care.

(:delete  predicate)
Removes predicate from the knowledge-base.

(:clear-slot  term slot)
Removes all values from slot slot of the frame referred to by term.

(:del-rule  term rule)

(:del-srule  term rule)
Used to delete a rule (or slot rule) from a frame.

(:del-rules  term slot)

(:del-srules  term slot)
Used to delete all rules (or slot rules) from a slot of a frame.