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A system is modeled as a composite part, and its part usages may themselves have further composite structure.

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SysML2.0: Inconsistent use of the term 'composite' used to describe BOTH elements that own usages of the corresponding kind AND for usages with isComposite=true (as opposed to referential usages with isComposite=false). Suggest use instead 'composed'.
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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 system is modeled as a composite part, and its part usages may themselves have further composite structure.
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The parts of a system may have attributes ... that represent different performance, physical and other quality characteristics.
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The parts may have ports ... that define the points at which those parts may be interconnected ...
Parts may also perform actions ... resulting in items flowing across the connections between them, and exhibit states ... that enable different actions.
A part can represent any level of abstraction, such as a purely logical component without implementation constraints, or a physical component with a part number, or some intermediate abstraction.
Parts can also be used to represent different kinds of system components such as hardware components, software components, facilities, organizations, or users of a system.
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