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SysML enforces its equivalence of navigation and ownership by means of constraints that the block stereotype enforces on the existing UML metamodel.

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SysMLv1: Why ParticipantProperty is needed for an AssociationBlock. (And why you should NOT use the optional Cameo Systems Modeler variant with owned ends.)
Source
OMG Systems Modeling Language (SysML) 1.7
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Association
Property::isNavigable()
Association::ownedEnd
SysML keywords
Block
Keywords
The only form of an association end that SysML allows an association to own directly is an unnamed end used to carry an inverse multiplicity of a reference property. This unnamed end provides a metamodel element to record an inverse multiplicity ...
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SysML enforces its equivalence of navigation and ownership by means of constraints that the block stereotype enforces on the existing UML metamodel.
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Related snippets
SysML excludes variations of associations in UML in which navigable ends can be owned directly by the association. In SysML, navigation is equivalent to a named property owned directly by a block.
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