Lifeline
A Lifeline in a UML Sequence Diagram represents an individual participant in the interaction. In Modeldraw, you can use Lifelines to model objects, actors, or processes that interact over time in your system.
Understanding Lifeline
A Lifeline represents a participant in a sequence of interactions. Key characteristics include:
It depicts an object, actor, or process in the system
It extends vertically to show the participant's existence over time
It can have activation bars to show when the participant is active or performing actions
It can be created or destroyed during the sequence
A Lifeline is represented in UML by a rectangle at the top (known as the "head") with a dashed line extending downwards.
Lifelines are fundamental elements in Sequence Diagrams and are used to:
Show the participants involved in a particular interaction
Indicate when participants are created or destroyed
Serve as sources and targets for messages
Display activation bars to show when a participant is active
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