How to use operations as messages in collaborations?



Hello,
for my project I have to check the consistency between Activity Diagrams and Collaboration Diagrams (based on UML 1.5). Therefore I have to compare the operations called in the diagrams.
The diagrams should show the flow of operations.
In an ActivityDiagram I connected an <ActionSate> to an <Operation> by adding an <internalTransition> which has a <trigger< to the <Operation> as <CallEvent>.
But in collaborations I haven't found a way to connect the <AssociationRoles> between two <ClassifierRoles> to an Operation.
Two <ClassifierRoles> could be connected through a <AssociationRole> which could contain some <Message>s. But it seems that there is no connection between a <Message> and an <Operation>.


Is there a way to connect the <AssociationRole> with <Operation> in the UML 1.5 MetaModel?
Or, do I have to enhance the Meta Model?
Or, would you suggest to check the consistency by comparing the name of the message in the Collaboration Diagram with the name of the operation used in the Activity Diagram.


Thank you
Chris





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