[gme-users] Re: Small question and discussion forums

Zoltan Molnar zolmol at isis.vanderbilt.edu
Thu Feb 23 10:17:44 CST 2006

If you specify 0..1 on the containment line the paradigm will have a constraint defined automatically.
However if you'd like to make that constraint preventive, you 
-either specify events for all automatic constraints in the Options dialog shown during MetaInterpretation [select the Event button near Containment and tick the newchild event]
-or create a custom constraint on the Constraint aspect attached to the Any container and select it to be checked on every OnNewChild event

If you chose the 1st option, any container/contaiment which is not 0..* will be checked on the NewChild event.
In the 2nd case your custom constraint can be defined so that it will check only Any models, upon NewChild event arrivals.


> Zawar Qayyum wrote:
> > Akos
> >  
> > I am using GME as part of my research in modelling an architectural
> > definition language Pi-ADL at Université de Bretagne-Sud. I 
> must say 
> > that its a very robust and well written tool. I have a 
> little question 
> > however: In my meta model I have a <<Model>> called Any, which can 
> > contain (through a containment relationship) atmost one instance of 
> > <<Atom>> BaseType. How do I express that in the subset of 
> OCL that GME 
> > implements? Customizing the multiplicity doesn't seem to have the 
> > desired effect since I want to /*prevent*/ the addition of 
> more than one 
> > BaseTypes.
> >  
> > I would have liked to post this question on a relevant discussion 
> > forum
> > but didn't find any. Could you point me to any such forum 
> that you know of?
> >  
> > Thanks in advance.
> > Zawar
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