[Uml-devel] bug

[Jens Krüger]

Am Donnerstag, 28. November 2002 22:43 schrieb Luis De la Parra Blum:
> On Thursday 28 November 2002 12:10, Jens Krüger wrote:
> > Am Donnerstag, 28. November 2002 11:50 schrieb Jonathan Riddell:
> > > > > Do you have an opinion on multiple outgoing associations in state
> > > > > diagrams?
> >
> > saves only two elements. I guess this diagramm comes from the early UML
> > specification (1.0 or 1.1)
>

I did not find anything in the spec that multiple associations from/to 
activities are __not__ allowed. (Part 10 "Activity Diagrams" of Chapter 3 
"UML Notation Guide" of the UML spec version 1.4)

> do the specs mention the branch/merge at all??  I know the fork/join is
> included (for concurrent activities) but (as far as I know) the only thing
> it says about multiple outgoing transitions is that if there is more than
> one outgoing transitions, then they MUST be differentiated by conditions.
>

You are right and I suggest to forbid (or not allow as you want) multiple 
associations from/to states. The user should use elements for branch/merge 
and fork/join to show what are her/his ideas.

> I think it is up to the tool (up to us) if we want to show this outgoing
> transitions going directly from the activity or if we want to use a branch.
> I think having them out of the activity is easier when you are doing the
> diagram, but it is not as clear to read as when you explicitly have to go
> through a branch, so I would say to force the use of branch.
>
> as for merges.... Incoming transitions are really no problem at all, and I
> would see no harm in having several incoming transitions to an activity,
> but maybe it would be confusing because it would not be balanced.... and it
> could get even worse when you have forks in your diagram.. so I guess for
> incomming transitions we should use merges explicitly.
>
>
> luis
>
>
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