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These multiplicities may be assumed if not shown on a diagram. To avoid confusion, any multiplicity other than the default should always be shown on a diagram.

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Figure D.18 - Defining Structure of Power Subsystem (PowerSubsystem Breakdown)
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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
RULE
UML keywords
Association
AggregationKind
multiplicity
AggregationKind::composite
AggregationKind::shared
MultiplicityElement::upperValue
MultiplicityElement::lowerValue
MultiplicityElement
MultiplicityElement::/lower
MultiplicityElement::/upper
Property::isNavigable()
DirectedRelationship::/target
SysML defines defaults for multiplicities on the ends of specific types of associations.
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These multiplicities may be assumed if not shown on a diagram. To avoid confusion, any multiplicity other than the default should always be shown on a diagram.
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A part or shared association has a default multiplicity of [0..1] on the black or white diamond end. A unidirectional association has a default multiplicity of 1 on its target end.
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