The interaction contains a combined fragment with 'alt', 'opt', or 'break' operator to model alternative execution sequences. The purpose of a sequence diagram is to show one scenario, not a set of different possible sequences. Activity diagrams are better suited for that purpose.

Consider using several sequence diagrams showing one scenario each, or use an activity diagram.

• Suggested in [Oes04].
• Value returned: name of the operator of the combined fragment.