:IS-CLASS

Purpose

Succeeds if the argument is a class.

Parameters

frame: A frame to be checked.

Examples

  (:IS-CLASS  :THING)
  (:IS-CLASS  Cats)
  (:IS-CLASS  ?x)

Success criteria

Succeeds if the frame is a class.

Failure criteria

Fails if the frame is not a class.

Notes

None.

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