Explore the UML sequence diagram
developer.ibm.com/articles/the-sequence-diagram/
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Use cases are often refined into one or more sequence diagrams.
sequence diagrams useful in documenting how a future system should behave.
he sequence diagram is used primarily to show the interactions between objects in the sequential orde
diagram's label, while providing a graphical boundary for the diagram
Lifelines represent either roles or object instances that participate in the sequence being modeled.
The first message of a sequence diagram always starts at the top and is typically located on the left side of the diagram for readability. Subsequent messages are then added to the diagram slightly lower then the previous message.
return message is drawn as a dotted line with an open arrowhead back to the originating lifeline,
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