The occurrence of a frame, i.e. a 'frame situation'. Its automatic classification under a frame is not trivial, since a frame is a reification of a multigrade predicate, and its semantic roles can be more or less required for a frame to be instantiated. When applicable, OWL keys can be used to express the minimal conditions, under which a frame class can be instantiated into a FrameOccurrence. Frame can be also (extensionally) represented as subclasses of FrameOccurrence.