After each execution of the bodyPart, the test section is executed again, for the next iteration of the loop.

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LoopNode: basic running example
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Activity
Activity Diagram
LoopNode
LoopNode::test
LoopNode::bodyPart
LoopNode:decider
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After each execution of the bodyPart, the test section is executed again, for the next iteration of the loop.
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A LoopNode is a StructuredActivityNode that represents an iterative loop. A LoopNode consists of a setupPart, a test and a bodyPart, which identify subsets of the ExecutableNodes contained in the LoopNode.
Any ExecutableNode in the LoopNode must be included in the setupPart, test or bodyPart for the LoopNode.
Execution of the test section may precede or follow execution of the bodyPart, depending on whether isTestFirst is true or false, respectively. ... If the bodyPart is executed first (isTestFirst=false), it is always executed at least once ...
The test section has an Action owning the decider OutputPin with type Boolean identified by the LoopNode. When the test section has completed execution, if the value on the decider OutputPin is true, then the bodyPart is executed. Otherwise ...
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A LoopNode may also define a set of loopVariable OutputPins used to hold intermediate values during each loop iteration. These OutputPins may have outgoing ActivityEdges, in order to make the values they hold available within the test and bodyPart ...
If a LoopNode has loopVariable OutputPins, then it must also have matching sets of loopVariableInput InputPins, bodyOutput OutputPins (owned by Actions within the bodyPart), and result OutputPins.
When the LoopNode begins executing, the tokens on the loopVariableInput InputPins are moved to the corresponding loopVariable OutputPins before the first iteration of the loop.
After the completion of each execution of the bodyPart of the LoopNode, any remaining tokens on the loopVariable OutputPins are destroyed and tokens on the bodyOutput OutputPins are copied to the corresponding loopVariable OutputPins so that they are ...
Once the test fails and the loop is completed, the tokens on the bodyOutput OutputPins from the last iteration are moved to the result OutputPins and offered on any edges outgoing from those OutputPins.
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