An output-argument always explicitly names the parameter to which it is to be matched. Any parameters that are not named are considered to have implicit wildcard arguments. (There is thus no need for an explicit wildcard notation for output-arguments.)

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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 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. However, if the Message has a signature that is an Operation with out or inout ownedParameters, then ...
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An output-argument always explicitly names the parameter to which it is to be matched. Any parameters that are not named are considered to have implicit wildcard arguments. (There is thus no need for an explicit wildcard notation for output-arguments.)
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If a reply-message-label does not include an output-argument-list and the Message has a signature, then this denotes that the Message has wildcard arguments corresponding to all out and inout ownedParameters of the signature Operation (if any).
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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