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A flow usage is declared as a streaming flow using the kind keyword flow.

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13. Flows: Flow Definition Example.sysml
SysMLv2: Cameo: TIP: Displays of flow connections (including proxy notation) do not always clearly display the directed features of the ends that participate in the payload exchange. But there are multiple ways of still displaying those directed features.
13. Flows: Flow Usage Example.sysml
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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A flow usage is declared as a streaming flow using the kind keyword flow.
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A flow declaration then includes a specification of not only the source and target related features of the flow, but, more specifically, the output feature of the source from which the flow receives its payload ... and the input feature of the target ...
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This is done by giving a feature chain with at least two features, the last of which identifies the output or input feature, with the preceding part of the chain identifying the source or target of the flow.
If no declaration part or payload specification is included in the flow declaration, then the from keyword may also be omitted.
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