[Modeling] Modeling an Agent Class- register your opinion

[Joaquin Peña]

Hello Stephen:

> Also, I think of UML's part-whole relationships as static
> modelling constructs. UML doesn't have anything to say about 
> the dynamic aspects of these relationships, except to say 
> that a composite has "responsibility for the existence and 
> storage of the composed objects". 

I agree with you Stephen, but I think that UML collaborations could 
be used to modell such dynamic associations.

> I think this is the right
> way to go. Your idea of congregation seems to be an attempt 
> to provide a whole-part relationship that has dynamic as well 
> as static semantics. In my opinion, it would be better to 
> keep these aspects of modelling orthogonal and provide 
> appropriate constraints that can be added to aggregations or 
> compositions to assert relationships between the lifetimes of 
> the composite and the parts.