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An interface definition is a kind of connection definition ... whose ends are restricted to be port definitions ...

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11. Interfaces: Interface Example.sysml
11. Interfaces: Interface Decomposition Example.sysml
SysML2.0: Webel: Suggest it needs to be clarified whether a regular connection (that is not an interface) may be used between ports.
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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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An interface definition is a kind of connection definition ... whose ends are restricted to be port definitions ...
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An interface usage is a kind of connection that is usage of an interface definition. The ends of an interface usage are restricted to be port usages.
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An interface is simply a connection all of whose ends are ports. As such, an interface facilitates the specification and reuse of compatible connections between parts.
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