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Whereas flow properties specify what “can” flow in or out of a block, item flows specify what “does” flow between blocks and/or parts in a particular usage context.

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ItemFlow without and with itemProperty - and compatible ItemFlows
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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
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INFO
SysML keywords
ItemFlow
Item flows specify the things that flow between blocks and/or parts and across associations or connectors.
Full quote
Whereas flow properties specify what “can” flow in or out of a block, item flows specify what “does” flow between blocks and/or parts in a particular usage context.
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This important distinction enables blocks to be interconnected in different ways depending on its usage context.
Related snippets
An ItemFlow describes the flow of items across a connector or an association. It may constrain the item exchange between blocks, block usages, or ports as specified by their flow properties.
An ItemFlow describes the flow of items across a connector or an association. The notation of an item flow is a black arrowhead on the connector or association. The arrowhead is towards the target element.
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.
Item flows in internal block diagrams specify flows local to a block.
Item flows specify the things that flow between blocks and/or parts and across associations or connectors.
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