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A calculation usage is an action usage that is a usage of a calculation definition.

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30. Calculations: Calculation Usages-1.sysml
30. Calculations: Calculation Usages-2.sysml
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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 calculation definition specifies a reusable computation that returns a result in the result parameter.
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A calculation usage is an action usage that is a usage of a calculation definition.
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A calculation definition is a kind of action definition ... that has a distinguished parameter with direction out called the result parameter (which is usually the only out parameter).
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In addition, the result parameter for a calculation definition or usage can be declared as an out parameter using the keyword return instead of out. Note that a calculation definition or usage always has a result parameter, inherited if not owned.
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