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First Class Entities

First class entities are those entities of the PCM that can exist within model instances without depending on other entities. Modelling instances have to start with a first class entity. First class entities of the PCM are: All other entities depend on first class entities - they cannot exist without an instance of first class entities. Those entities are called second class entities. For example a signature cannot exist without an interface.



Snowball 2007-03-16