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Proxy ports can be connected to internal parts or ports on internal parts, identifying features on those parts or ports that are available to external blocks.

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SysMLv1.6 Provided/required DirectedFeature contracts for ProxyPorts SHOULD be satisfiable Feature-wise (including as subsets of Features) not necessarily just at the level of entire Blocks (types)! [See also the SysMLv1.7 spec changes.]
ProxyPort cases - ADVANCED TOPIC
SysML directional FlowProperty contracts for ProxyPorts SHOULD be satisfiable Property-wise (including as subsets of Properties) not necessarily just at the level of entire Blocks!
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
Snippet kind
INFO
UML keywords
Port
part
Feature
SysML keywords
ProxyPort
part property
MD:PartProperty
Full quote
Proxy ports can be connected to internal parts or ports on internal parts, identifying features on those parts or ports that are available to external blocks.
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When a proxy port is connected to a single internal part [or port or internal part], the connector shall be a binding connector, or have the same semantics as a binding connector ...
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When a proxy port is connected to a single internal part [or port or internal part], the connector shall be a binding connector, or have the same semantics as a binding connector ...
(the value of the proxy port and the connected internal part are the same; links of associations typing the connector are between all objects and themselves, and no others)
When a proxy port is connected to multiple internal parts, the connectors have the same semantics as a single binding connector to an aggregate of those parts, supporting all their features, and treating flows and invocations from outside the aggregate...
This aggregate is not a separate element of the system, and only groups the internal parts for purposes of binding to the proxy port.
Internal connectors to proxy ports can be typed by association blocks, including when the connector is binding. Association
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