uml - composition relationship with abstract class -

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is possible there composition relationship ِabstract class using uml? think can't, because need object make relation, , when create abstract class, can't create object it.

yes possible, , useful. @ example :

uml composition abstract http://app.genmymodel.com/engine/xaelis/compositionabstract.jpg

building , room abstract , have composition relationship. right, need use 1 concrete class (house or flat) implement relationship.


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