Stop nodes in sequence diagrams

In sequence diagrams, a stop node represents the destruction of an object or indication that the object is no longer needed. Stop nodes are denoted by an X and can be created by a destroy message or by a destruction event.

As the following figure illustrates, a stop node is displayed at the bottom of a lifeline and is indicated by a destruction marker, which is denoted as an X.

An interaction frame shows two lifelines with one synchronous message and one combined fragment that crosses the lifelines. A stop node appears on the left lifeline below the combined fragment.

When you create a destroy message, a stop node is created automatically. However, you can manually create a stop node on a lifeline to indicate the object is no longer needed at a specific position using a destruction event.


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