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The default multiplicity of an attribute usage is [1..1], under the conditions described in 7.6.3.

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ISSUE: SysMLv2.0 spec Annex example and multiple SysMLv2 PILOT GitHub samples: Inconsistent use of subsetted ISQ «attribute» (has multiplicity [*] in Cameo) without explicit multiplicity. According to SysML2.0 spec. rules would inherit multiplicity [*].
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OMG Systems Modeling Language TM (SysML®) Version 2.0 formal/2025-09-03 (Sep 2025)
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The default multiplicity of an attribute usage is [1..1], under the conditions described in 7.6.3.
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If a multiplicity is not declared for a usage, then the usage inherits the multiplicity constraints of any other usages it subsets or redefines.
If no tighter constraint is inherited, the effective default is the most general multiplicity [0..*].
However, a tighter default of [1..1] is implicitly declared for the usage if all of the following conditions hold:
1. The usage is an attribute usage, an item usage (including a part usage, except if it is a connection usage), or a port usage.
2. The usage is owned by a definition or another usage (not a package).
3. The usage does not have any explicit owned subsettings or owned redefinitions.
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