SysML1.0:
'An ItemFlow describes the flow of items across a connector or an association. It may constrain the item exchange between blocks, block usages, or flow ports as specified by their flow properties. For example, a pump connected to a tank: the pump has an “out” flow property of type Liquid and the tank has an “in” FlowProperty of type Liquid. To signify that only water flows between the pump and the tank, we can specify an ItemFlow of type Water on the connector.'
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