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All usages declared within the body of a variation definition or usage are declared as variant usages by placing the keyword variant at the beginning of their declarations. Variant usages may only be declared within a variation.

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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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A definition or usage is specified as a variation by placing the keyword variation before its kind keyword. A variation is always abstract, so the abstract keyword is not used on a variation.
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All usages declared within the body of a variation definition or usage are declared as variant usages by placing the keyword variant at the beginning of their declarations. Variant usages may only be declared within a variation.
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The kind of a variant usage must be consistent with the kind of its owning variation.
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