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Incoming flows of a decision node [message #628265] Thu, 25 February 2010 13:11
Vincent   is currently offline Vincent Friend
Messages: 35
Registered: December 2009
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According to the UML specification UML Superstructure Specification, v2.2 (12.3.22, p360):
[1] A decision node has one or two incoming edges and at least one outgoing edge.

Hence, there is nothing in the specification that prevents the situations :
- a control node has two incoming control flow and one outgoing control flow (and no decision input flow)
- a control node has two incoming object flow and one outgoing object flow (and no decision input flow)

By reading the specification, I have the feeling that in case there is a second incoming flow it is necessarily the decision input flow. Moreover, the constraints on the decision input behavior ([5], [6], [7]) describe all cases but these two.

Do you think that these situations make sense or is there a constraint missing in the UML specification ?

Thanks in advance for your answers.
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