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The port types have an additional flow property that is not in the nested ports. These are for the flow of the engine, as opposed to its parts.

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Figure 9-17: Usage example of item flow decomposition
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Connector
InformationFlow::conveyed
SysML keywords
ItemFlow
AssociationBlock
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In Figure 9-17, the item flow classifier (Engine) composes the classifiers of the items flows in the decomposition from Figure 9-17.
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The port types have an additional flow property that is not in the nested ports. These are for the flow of the engine, as opposed to its parts.
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Constraints can be added between the flow properties for the engine and those for the parts, to indicate the flowing parts are inside the flowing engine, or are separate, for example as spare parts.
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Connectors with item flows can be decomposed by association blocks that have additional item flows. The relationship between an item flow and those in the association block is determined by the modeler.
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