actor instance



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From: Gonzalo Génova (ggenova@inf.uc3m.es)
Date: Mon 27 May 2002 - 14:56:02 BST


Hello,

According to the UML Standard (v1.4, p. 3-106), "A sequence diagram presents
either a collection of object symbols and arrows mapping to Instances and
Stimuli, or a collection of classifier-role symbols and arrows mapping to
ClassifierRoles and Messages."

We can represent the initiators of an interaction as actors in a sequence or
collaboration diagram (see the examples in p. 3-105 and p. 3-117).
Therefore, an actor symbol in an interaction diagram at instance level
represents an instance of an actor. However, there is no metaclass
ActorInstance in the UML metamodel. Is this an error in the metamodel?

Thanks,
Gonzalo

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