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Multiple arrows coming out of a standalone Pin rectangle is an optional notation for multiple edges coming out of an OutputPin.

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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
NOTATION
UML keywords
ObjectNode
ActivityEdge
ObjectFlow
The standalone Pin in the notation maps to an OutputPin and an InputPin and one ObjectFlow edge between them in the underlying model. This form should be avoided if the Pins are not of the same type.
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Multiple arrows coming out of a standalone Pin rectangle is an optional notation for multiple edges coming out of an OutputPin.
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An object flow is notated by an arrowed line. In Figure 15.9, upper right, the two object flow arrows denote a single object flow edge between two pins in the underlying model, as shown in the lower middle of the figure.
The situation in which the OutputPin of one Action is connected to the InputPin of the same name in another Action via an ObjectFlow may be shown by the optional notations of Figure 16.6.
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