Blocks with ports can type other ports (nested ports).

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OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Port
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nested Port
SysML extends blocks to support flow properties and provided and required features.
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Blocks with ports can type other ports (nested ports).
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Ports nest other ports in the same way that blocks nest other blocks. The type of the port is a block (or one of its specializations) that also has ports.
For example, the ports supporting torque flows in the transmission example might have nested ports for physical links to the engine or the driveshaft.
ProxyPort::3_subports_are_proxyports Ports owned by the type of a proxy port shall be proxy ports.
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