I have some problems using OCL together with collaborations and collaboration uses. I would be very grateful if you oculd help me with
Imagine we have a Sale collaboration with two roles: buyer and seller. Now, by means of a collaboration use, we bind both roles to the
same classifier, namely Person. An instance of Person may then behave either as a seller or as a buyer in a Sale collaboration.
However, we do not want the same instance of Person to play both the seller and the buyer roles in the same occurrence of a Sale
collaboration (i.e. we do not want a person to sell to herself).
Would the following OCL invariant, specified in the context of the collaboration use, be correct?
inv s.roleBinding->forAll(b1, b2 | b1.client.allInstances->forall(Person p1 | b2.client.allInstances->forall(Person p2 | p1 <> p2)))
Thanks for you help!
Received on Fri 22 Feb 2008 - 18:47:10 GMT