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ordered – If a usage is ordered, then the values of the usage can be placed in order, indexed from 1 to the number of values. The default is that the feature is unordered.

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SysML2.0: CAUTION: The "modifiers" nonunique and ordered are NOT inherited by redefinitions or subsettings (unlike effective multiplicity inheritance)
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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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nonunique – If a usage is non-unique, then the same value may appear more than once as a value of the usage. The default is that the usage is unique, meaning that no two values of the usage may be the same.
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ordered – If a usage is ordered, then the values of the usage can be placed in order, indexed from 1 to the number of values. The default is that the feature is unordered.
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A multiplicity may be optionally followed by one or both of the following keywords (in either order), or they can be used without giving an explicit muiltiplicity, at any place in the declaration a multiplicity would be allowed.
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