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This includes the direction of flow properties on nested ports, and if the port is full and its type is unencapsulated, ports on parts of the port, recursively. The arrows are perpendicular to the boundary lines they overlap.

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Figure 9-16: Usage example of item flow decomposition
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
SysML keywords
ProxyPort
FullPort
FlowProperty
FlowProperty::direction
FlowDirectionKind::in
FlowDirectionKind::out
Ports with types that have flow properties all in the same direction, either all in or all out, can have an arrow inside them indicating the direction of the properties with respect to the owning block.
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This includes the direction of flow properties on nested ports, and if the port is full and its type is unencapsulated, ports on parts of the port, recursively. The arrows are perpendicular to the boundary lines they overlap.
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Ports with types that have flow properties in different directions or flow properties that are all in both directions, including have two open arrow heads inside them facing away from each other (<>). This includes the directions of nested and...
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Ports with types that have flow properties all in the same direction, either all in or all out, can have an arrow inside them indicating the direction of the properties with respect to the owning block.
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