Наконец нашел описание сути  данного термина
> -- Цитата:
> Zonnon uses a compositional inheritance model based on aggregation. Typically, an object (or module) is composed of a number of functional components, each of them presenting itself to clients in the form of an abstract definition. The set of definitions plus the object’s intrinsic interface (that is the set of all public elements of the object) constitutes the interface between the object and its clients.