In the edit field below the list box, enter the constraint expression for this action. The possible options are OCL and plain text. They provide a graphical notation to define the sequential, conditional, and parallel composition of lower-level behaviors. In the Local Precondition and Local Postcondition tabs, select the language of the constraint expression from the Language list box.In the Properties, View, Description, and Custom tabs, configure standard properties of the element.Use the Object Inspector to adjust action properties, including: Using decisions and merges, you can manage multiple outgoing and incoming control flows. An Activity Diagram can be created only from an Activity: right-click the Activity, select New. Note that the flow final may not have any outgoing links. Activity Diagrams allow you to model the behavior of an Activity. The flow final node means that a certain flow within an activity is complete. ![]() Data and control flows are different in UML 2.0.Ī control flow may have multiple sources (it joins several concurrent actions) or it may have multiple targets (it forks into several concurrent actions).Įach flow within an activity can have its own termination, which is denoted by a flow final node. By flow, we mean that the execution of one node affects and is affected by the execution of other nodes, and such dependencies are represented by edges in the activity diagram. The semantics of activities is based on token flow. ![]() The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise. An action is an executable activity node that is the fundamental unit of executable functionality in an activity, as opposed to control and data flow among actions. There are two kinds of final nodes, referred to as as activity final node and flow final node. An activity represents a behavior which is composed of individual elements that are actions. An exit point in an activity diagram is called an final node. An action represents a single step within an activity, that is, one that is not further decomposed within the activity. Actions are not states (compared to UML 1.x) and can have subactions. ![]() In UML 2.0, activities consist of actions. If an action can be broken into a sequence of other actions, you can create an activity to represent them. Actions are the basic units of the system behavior.Īn Activity diagram enables you to group and ungroup actions. They are both behavioral diagrams but have different emphases. The activity diagram enables you to model the system behavior, including the sequence and conditions of execution of the actions. An activity diagram is a means of expression of the Unified Modelling Language (UML), with which temporal processes within a. Proof: A p-planar graph is planar by definition. Go Up to UML 2.0 Activity Diagrams Definition Figure 1: An UML activity diagram taken from the UML 2.0 Su- perstructure.
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