the class of model fragments about a contol-volume
the control volume
(Forall (?Cv-Involved) (<=> (Control-Volume ?Cv-Involved) (Exists (?Self) (And (Control-Volume-Op-Mode ?Self) (= (Cv-Involved ?Self) ?Cv-Involved))))) (Forall (?Self ?Time) (<=> (Active ?Time Control-Volume-Op-Mode ?Self) (Control-Volume-Op-Mode ?Self)))