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If a multiplicity is not explicitly declared for an end feature, then a default of 1..1 is implicitly declared for it (regardless of the usual conditions for default multiplicity ...

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SysMLv2: Cameo 2026xR1: Evaluation Plugin: CAUTION with connection end multiplicities when reference subsetting a usage with a tighter multiplicity constraint greater than 1 (tighter than [*] such as [3]). FORCE that end multiplicity explicitly to [1].
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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The end features of a connection definition or usage identify the participants in the connections that are instances of the connection definition or usage and must have multiplicity 1..1
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If a multiplicity is not explicitly declared for an end feature, then a default of 1..1 is implicitly declared for it (regardless of the usual conditions for default multiplicity given in 7.6.3 ).
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Note however that this is NOT automatically respected by Cameo in all cases:
SysMLv2: Cameo 2026xR1: Evaluation Plugin: CAUTION with connection end multiplicities when reference subsetting a usage with a tighter multiplicity constraint greater than 1 (tighter than [*] such as [3]). FORCE that end multiplicity explicitly to [1].
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