Create message is a kind of message that represents the instantiation of (target) lifeline.It's target points to an activation on top of the activation where the message was invoked from. Recursive message is a kind of message that represents the invocation of message of the same lifeline.Self message is a kind of message that represents the invocation of message of the same lifeline.Return message is a kind of message that represents the pass of information back to the caller of a corresponded former message.Call message is a kind of message that represents an invocation of operation of target lifeline.A message defines a particular communication between Lifelines of an Interaction. ![]() The top and the bottom of the of the rectangle are aligned with the initiation and the completion time respectively.A thin rectangle on a lifeline) represents the period during which an element is performing an operation.A lifeline represents an individual participant in the Interaction.A person may play the role of several different actors and, conversely, a given actor may be played by multiple different person.An actor does not necessarily represent a specific physical entity but merely a particular role of some entity.represent roles played by human users, external hardware, or other subjects.external to the subject (i.e., in the sense that an instance of an actor is not a part of the instance of its corresponding subject).a type of role played by an entity that interacts with the subject (e.g., by exchanging signals and data).Note That: Class and object diagrams are static model views. The object initiating the sequence of messages is a Reservation window. The objects involved in the operation are listed from left to right according to when they take part in the message sequence.īelow is a sequence diagram for making a hotel reservation. ![]() The time progresses as you go down the page. Sequence diagrams are organized according to time. Sequence Diagram is an interaction diagram that details how operations are carried out - what messages are sent and when. The vertical space in an interaction diagram is not relevant for the duration of the interaction. Time in a sequence diagram is all a about ordering, not duration.
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