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ProxyPort::2_interfaceblock Proxy ports shall only be typed by interface blocks.

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ProxyPort minimal example - delegation to part
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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CONSTRAINT
SysML keywords
ProxyPort
InterfaceBlock
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2_interfaceblock

Proxy ports shall only be typed by interface blocks.

InterfaceBlock.allInstances().base_Class->includes(self.base_Port.type)
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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.
Proxy ports are always typed by interface blocks, a specialized kind of block that has no behaviors or internal parts.
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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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