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Object Flow
Description
Object Flows are used in Activity diagrams and StateMachine diagrams. When used in an Activity diagram, an Object Flow connects two elements, with specific data passing through it, modeling an active transition. To view sample Activity diagrams using Object Flows, see the Object Flows in Activity Diagrams topic.
In StateMachine diagrams, an Object Flow is a specification of a state flow or transition. It implies the passing of an Object instance between elements at run-time.
You can insert an Object Flow from the 'State' or 'Activity' pages of the Toolbox, or from the drop-down list of all relationships located in the header toolbar. You can also modify a transition connection to an Object Flow by selecting the 'ObjectFlow' checkbox on the connection 'Properties' dialog.
See the Control Flow topic for information on setting up Guards and Weights on Object Flows.
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OMG UML Specification:
The OMG UML specification (UML Superstructure Specification, v2.1.1, p.389) states:
An object flow is an activity edge that only passes object and data tokens.