Using non-flow properties means to read or write them, and using behavioral features means to invoke them.

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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
Property
BehavioralFeature
Operation
Reception
SysML keywords
DirectedFeature
FeatureDirectionKind::required
value property
block property
(the owning block for features on types of proxy ports is the type of the block usage the proxy port is standing in for, which might be an internal part).
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Using non-flow properties means to read or write them, and using behavioral features means to invoke them.
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Provided non-flow properties are read and written on the owning block, while required non-flow properties are read or written on an external block
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[SysML1.6: PREFER SysML1.7] A DirectedFeature indicates whether the feature is supported by the owning block (provided), or is to be supported by other blocks for the owning block to use (required), or both ...
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Provided behavioral features are invoked with the owning block as target, while required behavioral features are invoked with an external block as target (required).
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