Re: signals

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From: Esha Ray (
Date: Fri 27 Sep 2002 - 19:50:56 BST

Hi Peter,

Can you give the exact web adress of this proposal because I searched on google but didn't find it.

  ----- Original Message ----- 
  From: Peter Green 
  Sent: Friday, September 27, 2002 5:25 AM
  Subject: RE: signals



  We've had trouble understanding the semantics of signals too. However, I found the proposal for UML 2.0 (dated 28th Jan 2002) from Rational, Telelogic et al very helpful in tying up a lot of loose ends. 




  Dr. Peter Green,

  Department of Computation,


  Manchester M60 1QD,


  Phone: +44-161-200-3378

  Fax: +44-161-200-3324



  -----Original Message-----
  From: [] On Behalf Of Esha Ray
  Sent: 25 September 2002 18:58
  Subject: signals




  I am student at UMass, Amherst and I am working with LASER(Lab for Advanced Software Engineering Research). I am working with activity diagrams and tring desperately to understand its semantics. We are really stuck with signals right now. The UML user guide, reference manual give very ambigous statemnets about signals. They also say that acticity diagrams do not have events but only signals. I am not clear on teh exact semantics about signals. Signals are also classifiers and we can have a class diagram on the hierarchy of signals int he system. Can anyone please tell me what exactly signals do in an activity diagram and how are they interpreted.



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