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Features that are not denoted as a DirectedFeature are implicitly provided features. As such they can be matched against a corresponding required feature.

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In general, the SysML DirectedFeature approach is more powerful and the notation is cleaner than UML provided/required Interfaces. Prefer SysML DirectedFeatures unless you have a really good reason to use Interfaces!
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OMG Systems Modeling Language (SysML) 1.7beta1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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SysML keywords
DirectedFeature
FeatureDirectionKind::provided
FeatureDirectionKind::required
FeatureDirectionKind::providedrequired
FeatureDirectionKind
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Features that are not denoted as a DirectedFeature are implicitly provided features. As such they can be matched against a corresponding required feature.
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The ~InterfaceBlock stereotype (shall be pronounced: "conjugated interface block") is a specialization of InterfaceBlock that has the same features as its original InterfaceBlock except that its DirectedFeatures and FlowProperties are reversed (conjugated
A DirectedFeature has the same notation as other non-flow properties and behavioral features with a feature direction prefix (prov | reqd | provreqd), which corresponds to one the FeatureDirectionKind literals “provided,” “required,” and “providedrequired
Directed features can appear in compartments for the various kinds of properties and behavioral features.
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