Loop in MSC should have boundaries
The Formal semantics of Message Sequence Charts by the INTERNATIONAL TELECOMMUNICATION UNION say that the inline expression for a loop should include boundaries in angle brackets “<>” (please see picture “loop_example_MSC_doku.png” for an example). Those should be editable in the MSC editor.
(from redmine: issue id 754, created on 2012-03-28, closed on 2012-04-13)