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In general, a definition element classifies a certain kind of element (e.g., a classification of attributes, parts, actions, etc.). A usage element is a usage of a definition element in a certain context.

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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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In general, a definition element classifies a certain kind of element (e.g., a classification of attributes, parts, actions, etc.). A usage element is a usage of a definition element in a certain context.
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A usage must always be defined by at least one definition element that corresponds to its usage kind. For example, a part usage is defined by a part definition, and an action usage is defined by an action definition.
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If no definition is specified explicitly, then the usage is defined implicitly by the most general definition of the appropriate kind from the Systems Library ... For example, a part usage is implicitly defined by the most general part definition Part ...
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