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  1. OMG Issue

UML14 — Change events issue

  • Key: UML14-882
  • Legacy Issue Number: 1689
  • Status: closed  
  • Source: Anonymous
  • Summary:

    Summary: Change events should be generalizable. For example, a traffic light
    changing to any color is a more general event than a change of that
    traffic light to Red only. If the second event happens, then the
    first must have happened also. A state machine with a trigger event
    on the first event will transition if the second event occurs.

    The semantics document says that an event can trigger transitions which
    have a more general event [p 113, UML 1.1 Semantics].


    This is close to issue # 29, "Events should be generalizable
    elements", which Rumbaugh filed and withdrew. His reasoning is that
    signals are generalizable and event are just pointers to them, so it
    is not necessary for events to be generalizable. In fact, events are
    more than pointers to signals, as shown in the event meta-model
    [figure 18, page 98, of UML 1.1 Semantics]. Events also cover call
    events, time events, and change events.

  • Reported: UML 1.1 — Fri, 17 Jul 1998 04:00 GMT
  • Disposition: Resolved — UML 1.2
  • Disposition Summary:

    Considered and declined.

  • Updated: Fri, 6 Mar 2015 21:36 GMT