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MessageEvent (from Communications ) on page 463
A SendOperationEvent models the invocation of an operation call.
No additional attributes
• operation : Operation  The operation associated with this event.
No additional constraints
A send operation event specifies the sending of a request to invoke a specific operation on an object. The send operation
event may result in the occurrence of a call event in the receiver object (see Common Behaviors on page 437), and may
consequentially cause the execution of a behavior by the receiver object.
Changes from previous UML
New in UML 2.0.