UML22 — Multiple activity edges between a given pair of activity nodes possible ?

Multiple activity edges between a given pair of activity nodes possible ?

Currently, there is no constraint which would forbid two Activity Edges with the same source/target pair, i.e.

--------- -------- | A1 | --------> | A1 | | | | | | | --------> | | -------- ---------

The following constraint should be added to the Constraints section of Activity Edge on page 293:

Constraints

[3] There is at most one ActivityEdge given a source and a target Activity Node. source.outgoing->select(ae | ae.source = source and ae.target = target)>size() = 1 and target.incoming>select(ae | ae.source = source and ae.target = target)->size() = 1

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