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Sequential Node

On a diagram, Sequential Activity Nodes have broken borders, and can contain nested elements that define a sequence of actions.

Sequential Nodes are flagged as composite elements in the context menu ('New Child Diagram | Composite'); however, when you add the child diagram the element converts to a simple composite Activity.

A UML Sequential Activity Node element.

OMG UML Specification:

The OMG UML specification (UML Superstructure Specification, v2.1.1, p.408) states:

A sequence node is a structured activity node that executes its actions in order.