Signal shape

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A signal UML Signal shape icon is a generalizable element defined independently of the classes handling the signal. It specifies an asynchronous stimulus communicated between instances to which there is no reply. The receiving instance handles the signal by a state machine. A signal can be attached to a classifier, which means that instances of the classifier can receive the signal.

Name a Signal shape and add other property values

Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.

Tip: Control which property values display on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.





Type a name for the signal.

Full Path

The UML Model Diagram template automatically provides full information about the element's path in the system model hierarchy. You can't edit this information but if you move elements the path automatically updates.


Choose the stereotype you want from the drop-down list. If a stereotype you want to use isn't listed, you can add a new stereotype or edit an existing one by clicking Stereotypes on the UML menu.


Choose the type of visibility (public, private, or protected) that applies to the signal.


Select to indicate that the signal can't have ancestors.


Select to indicate that the signal can't have descendants.


Select to indicate that the signal is abstract and that no instances can be created for the signal.


Type any documentation you want to add to the element as a tagged value. When you select the shape or icon representing the element, the documentation you type here also appears in the Documentation window.

Control which property values are displayed on the Signal shape

Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.

Hide the parameters on a Signal shape

Right-click the shape, click Shape Display Options, and then, under Suppress, select Parameter.

Navigate to other views of the signal

Right-click the shape, click Views, select the view you want, and then click OK.

Show, in a view, the relationships between the signal and other elements

Right-click the shape, and then click Show Relationships.

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