![]() You can use an Interaction element to insert an Interaction diagram as a child of a Class element. The State/Continuation element serves two different purposes for Sequence diagrams, as State Invariants and Continuations. This example Sequence diagram demonstrates several different elements.Īn Actor is a user of the system user can mean a human user, a machine, or even another system or subsystem in the model.Ī Lifeline represents a distinct connectable element and is an individual participant in an interaction.īoundary elements are used in analysis to capture user interactions, screen flows and element interactions.Ī Control organizes and schedules other activities and elements.Īn Entity is a stereotyped Object that models a store or persistence mechanism that captures the information or knowledge in a system.Ī Fragment element can represents iterations or alternative processes in a Sequence diagram.Īn Endpoint is used in Interaction diagrams to reflect a lost or found Message in sequence.Ī Diagram Gate is a simple graphical way to indicate the point at which messages can be transmitted into and out of interaction fragments. You generate Sequence diagram elements and connectors from the 'Interaction' pages of the Toolbox. To toggle the numbering of messages on a Sequence diagram, select or deselect the 'Show Sequence Numbering' checkbox on the 'Preferences' dialog.
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