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Ordering in Sequence Diagrams [message #1090332] Tue, 20 August 2013 02:01
Belen Rolandi is currently offline Belen RolandiFriend
Messages: 4
Registered: August 2013
Junior Member


I'm working with the UML metamodel for sequence diagrams and i have a question regarding the ordering of occurrence specifications. According to the UML spec, occurrence specifications are ordered along a lifeline, but i'm not sure how is it that this ordering is actually determined. Can it be deduced from the physical ordering (position) of interaction fragments in the coveredBy list of each lifeline? Or it needs to be specified by defining additional ordering constraints, i.e., using the GeneralOrdering element?

And in general, how is the overall sequence of messages in the diagram inferred according to the metamodel?

Thanks a lot for the help.

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