The class of behavior constraint structural-element-models.
(=> (= (It-Is-* ?Entity) ?Result) (Or (Model-Fragment ?Entity) (Qualitative-Parameter ?Entity) (Quantity-Slot ?Entity) (Other-Slot ?Entity) (Behavior-Constraint ?Entity))) (=> (= (Notes ?Entity) ?Result) (Or (Model-Fragment ?Entity) (Qualitative-Parameter ?Entity) (Quantity-Slot ?Entity) (Other-Slot ?Entity) (Behavior-Constraint ?Entity))) (=> (Constraint-Expression $X $Y) (Behavior-Constraint $X))