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))