UML22 — drawing a frame to represent Combined Fragment or an Interaction Occurrence

I seem to remember that when drawing a frame to represent a Combined Fragment or an Interaction Occurrence there is a notation that indicates whether a given lifeline overlapped by the frame is actually covered by the fragment/occurrence or not. I believe that it hinged on whether the frame obscured the lifeline or not. However, I can't find reference to it in the spec. It would be good to have this notation described with an example, to avoid different vendors inventing their own notations.

Discussion: It is correct that there is no such notation suggested in the standard. The ITU standard Z.120 has a specific notation for lifelines that are not covered by a combined fragment, but we have not included that in UML 2. The reason, I believe, is that it is basically a matter of taste whether you want to include as covered in a combined fragment a lifeline that has no internal fragments (such as occurrence specifications). Disposition: Closed, no change