Architecting and designing : SysML : Model Elements : Ports : Port on Property
  
Port on Property
Ports are notated by rectangles overlapping the boundary of their owning blocks or properties (parts or ports) typed by the owning block.
Modeling a Port on a Property
The Port on Property symbol can only be drawn onto a Property symbol on a SysML Block diagram.
A Port is a specialized Property.
While the Port on Class symbol populates the appropriate property references when drawn, the Port on Property symbol does not, because it is an indirect reference.
See also
Port on Class
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Ports