OuterEnds

trait OuterEnds:
    .doc: """
    This trait is used with composite arms that consists of several
    articulating intermediate parts. These two mate connectors
    will store references to the start of the first arm segment and
    the end of the last arm segment.
    """

    start_connector is Physics3D.Interactions.MateConnector reference
    end_connector is Physics3D.Interactions.MateConnector reference

    start_arm_segment is MachineModeling.Components.Primitive.Base or MachineModeling.Components.Composite.Base reference
    end_arm_segment is MachineModeling.Components.Primitive.Base or MachineModeling.Components.Composite.Base reference