UML23 — Section: 14.3.20 Actors in Interactions

It is common to model interactions with actors, e.g. to show scenarios how actors interact with the system. For example in the context of a collaboration it is possible to model lifelines that represent system actors. However it is not possible that they receive messages in an interaction. According to constraint [2] in chapter 14.3.20 each message must correspond to an operation or signal. But it is not allowed to have actors with operations or receptions.

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