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If a reply Message does not have a signature, then the only argument that may be specified for it is a return argument as specified above.

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Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
reply-message-label
Message
Message::messageSort
MessageSort
MessageSort::reply
ValueSpecification
Operation
ParameterDirectionKind::return
Parameter
If the Message has a signature without a return parameter, then no assignment-target or value-specification may be given for the reply-message-label as a whole.
Full quote
If a reply Message does not have a signature, then the only argument that may be specified for it is a return argument as specified above.
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Related snippets
17.4.4.1 Message - A message is shown as a line from the sender MessageEnd to the receiver MessageEnd. The line must be such that every line fragment is either horizontal or downwards when traversed from send event to receive event.
A reply Message (messageSort equals reply) has a dashed line with either an open or filled arrow head.
A reply-message-label may optionally have an assignment-target given to the left of the message-name, with a corresponding returned value denoted by the optional value-specification given after a colon at the end of the reply-message-label.
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