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Proxy ports do not specify their own behaviors or internal parts, and shall be typed by interface blocks. Their nested ports shall also be proxy ports.

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Source
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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INFO
UML keywords
Port
Behavior
part
SysML keywords
ProxyPort
InterfaceBlock
nested Port
part property
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Proxy ports do not specify their own behaviors or internal parts, and shall be typed by interface blocks. Their nested ports shall also be proxy ports.
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Proxy ports define the boundary by specifying which features of the owning block or internal parts are visible through external connectors, while full ports define the boundary with their own features.
Proxy ports are always typed by interface blocks, a specialized kind of block that has no behaviors or internal parts.
Proxy ports identify features of the owning block or its internal parts that are available to external blocks through external connectors to the ports. They do not specify a separate element of the system from the owning block or internal parts.
ProxyPort::2_interfaceblock Proxy ports shall only be typed by interface blocks.
ProxyPort::3_subports_are_proxyports Ports owned by the type of a proxy port shall be proxy ports.
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