[news.eclipse.modeling.mdt.uml2] Re: Sequence Diagram Messages

[Timothy Marc <timothymarc@xxxxxxxxxx>]

Mary,

the ordering of the messages in an interaction is determined by the 
elements MessageOccurrenceSpecification(MOS), which represent the 
sending and receiving of a message.

Each MOS contains exactly one association to an Event 
(SendOperationEvent, SendSignalEvent, etc.), that represents the kind of 
message event. So, the ordering depends on the ordering of the MOS. If 
you want to add to message as the first message afterwards, you have r 
create not only the message, but also the corresponding occurrence 
specifications.

HTH
Timothy

mary schrieb:
> Hi, How can we add a message to an existing Interaction. I checked the 
> metamodel for the element Message and I can't find which attribute is 
> responsible to define the source and target of the message.
> For example in State Machine if you want to create a transition there is 
> an attribute source and target that specify the two ends of the 
> transition.. How can we do that in sequence diagrams?
>
> Also which element/attribute is responsible to specify the position of 
> the message in the interaction diagram.. (i.e. first message in a 
> specific lifeline or the second..etc)
>
> Thanks.