Creating lifelines in UML diagrams

In UML diagrams, such as sequence and communication diagrams, you can create lifelines to represent objects in a system.
You must have a sequence or communication diagram open.
To create a lifeline:
  1. In the Palette, click Lifeline.
  2. Click in an interaction frame where you want to add the new lifeline.
  3. Type a name for the new lifeline and press Enter.
  4. Type a name for object type and press Enter.
If you are creating a lifeline in a sequence diagram, the lifeline is aligned vertically with other lifelines in the interaction, and extends downward to cover the length of the interaction frame.
Note: You can move a lifeline to make a diagram easier to read. To move the lifeline left or right in a sequence diagram, drag the selected lifeline horizontally to a new location in the interaction frame.
Tip: You can also assign an existing element type in the navigation view to a lifeline. In the navigation view, click a class, interface, or data type and drag it onto a lifeline in the interaction frame.
Related concepts
Sequence diagrams
Lifelines in UML diagrams

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