10.5 Exchanging Messages between Lifelines
Messages can be exchanged between the instances represented by lifelines to achieve interactions. A message can be sent from a lifeline to itself to represent a message that is sent and received by the same instance.
A message represents an invocation or request for service from the sending lifeline to the receiving lifeline, or the sending of a signal from the sending lifeline to the receiving lifeline. A message is shown on a sequence diagram as a line with different arrow heads and annotations depending on the type of message.
Messages are sent by behaviors that are executing on a lifeline, or more precisely invocation actions, such as send signal or call operation actions, within those behaviors. ...
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