RE: signals



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From: Peter Green (peter.n.green@co.umist.ac.uk)
Date: Fri 27 Sep 2002 - 10:25:54 BST


Hi,
 
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. 
 
Peter.
 
Dr. Peter Green,
Department of Computation,
UMIST,
Manchester M60 1QD,
UK.
Phone: +44-161-200-3378
Fax: +44-161-200-3324
Email: peter.n.green@co.umist.ac.uk
 
-----Original Message-----
From: puml-list-request@cs.york.ac.uk
[mailto:puml-list-request@cs.york.ac.uk] On Behalf Of Esha Ray
Sent: 25 September 2002 18:58
To: puml-list@cs.york.ac.uk
Subject: signals
 
Hi!
 
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.
 
-Esha

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