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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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
Snippet kind
INFO
UML keywords
Association
Property::isNavigable()
Association::ownedEnd
SysML keywords
Block
Keywords
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.
Full quote
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, to cover the specific case of a unidirectional reference that defines no named property for navigation in the inverse direction.
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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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