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Simultaneous composition and generalization

PostPosted: Mon Jul 08, 2019 5:09 pm
I saw a BDD in which a part is also a superclass. In other words, the owner has a part and the owner is also a specialization of its part.

I also saw another BDD, by the same person, in which the owner is a generalization (vs. specialization) of its part.

What does that mean? Why would a modeler do that?