SYSML17 — Suggest capability to list :features on Pin symbols and on elided Pin "ObjectNode" rectangle symbol

SysML already has the capability to list :features (such as :values, :operations etc.) in compartments on Property and Port symbols in IBDs.

The same capability could be introduced for Pin symbols in Activity Diagrams to reveal :features of the types of Pins.

UML2.5.1 describes also an elided Pin notation where a single rectangular "ObjectNode" symbol along with two arrows (not edges) represents two Pins of identical type and a single ObjectFlow edge (in the underlying model). This notation does not have good support in all tools. It could however also benefit from the ability to list :features on that "ObjectNode" symbol (where the type is the type of the 2 Pins it actually represents).