Study Cards on lifeline, received, synchronous
Where either part of the name may be empty, but not both.
As they are not objects, we do not underline the participant names,
From the perspective of the each timeline, moving from the top of the diagram to the bottom represents the order of time
At the CirculationSystem, the mayIBorrowBooks message is received before it sends the yesYouMay message.
However, lifelines can be created during an Interaction, in which case the heads are located at the point of creation.
2. A Synchronous call ( Sen )
3. Synchronous call ( Received )
4. A Synchronous call ( Received)
5. Synchronous message ( Return )
6. Participant Creation
7. Object Destroyed
8. Self Message
9. Execution Specification
You will probably find many examples in the literature of lifelines headed by Actors.
Unfortunately, Actors cannot be connectable elements and cannot be parts.
On the other hand, all the UML tools will support the use of Actors as lifelines.
This approach is usually explained as reasonable because of changing system perspective.
if you focus on one subsystem, all the other subsystems will be as an Actor to the subsystem of interest, but all the subsystems are ultimately only parts of the system-as-a-whole.
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