Issue 6991: transtion (uml2-rtf) Source: Commissariat a l Energie Atomique-CEA (Dr. Sebastien Gerard, sebastien.gerard(at)cea.fr) Nature: Clarification Severity: Minor Summary: Issue 2: In the same spirit, we would like also to specifiy that a transtion is fired only if an event is not available at a given instant. We need the concepts of instant and event absence. Note that the absence combined with "and" and "or" can express kinds of priorities (e.g., "a and not b"). Resolution: Triggering a transition with the absence of an event seems to make sense only under a synchronous semantics which defines slices of time where that event might occur or not. It require a major modification or enhancement to the current, asynchronous Run-To-Completion semantics, where events are handled one by one in a timeless sequence. This therefore needs to be postponed to a more major revision, when we will have time to investigate this proposal and see if and how it can be accommodated. Revised Text: N/A Disposition: Closed, out of scope Revised Text: Actions taken: February 17, 2004: received issue April 26, 2010: closed issue April 26, 2010: closed issue Discussion: This proposal is relevant in case where simultaneity of events is allowed as requested in issues 6990. Since 6990 is deferred, this request shall be deferred as well. Due to lack of time, the RTF/FTF agrees that the following are problems that need fixing, but decided to defer their resolution to a future RTF working on this specification. End of Annotations:===== m: webmaster@omg.org Date: 17 Feb 2004 10:59:08 -0500 To: Subject: Issue/Bug Report -------------------------------------------------------------------------------- Name: Sébastien Gérard Company: CEA-List mailFrom: sebastien.gerard@cea.fr Notification: Yes Specification: UML2 superstructure Section: Behavior FormalNumber: ptc/03-08-02 Version: 2.0 RevisionDate: 08/01/03 Page: 217- Nature: Clarification Severity: Minor HTTP User Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705) Description Issue 2: In the same spirit, we would like also to specifiy that a transtion is fired only if an event is not available at a given instant. We need the concepts of instant and event absence. Note that the absence combined with "and" and "or" can express kinds of priorities (e.g., "a and not b").