This choice has no attribute.

Association	Multiplicity	Role	To	Role description
	0..1	airportReferencePoint	AirportHeliport	the point designated as the center of the airport.
	0..1	aimingPoint	TouchDownLiftOff	The point at the centre of the TLOF.
	0..1	runwayPoint	RunwayCentrelinePoint	A designated point on the runway centreline.
	0..1	position	Point	An unnamed point designated only with a latitude/longitude.
	0..1	navaidSystem	Navaid	A navaid used as significant point.
	0..1	fixDesignatedPoint	DesignatedPoint	A selected point that may have references (distance and/or angle indications)

From	Association	Multiplicity	Role	To	Role description
Surface
AngleIndication	uses	0..1	pointChoice	A choice of a navaid, an airport reference point, a TLOF aiming Point, a fix , a lat/long indicated by point object, or a Rwy threshold which defines the facility makeup..
DistanceIndication	uses	0..1	pointChoice	A choice of a navaid, an airport reference point, a TLOF aiming Point, a fix , a lat/long indicated by point object, or a Rwy threshold which defines the facility makeup.
SegmentPoint	isLocatedAt	0..1	pointChoice	A choice of a navaid, an airport reference point, a TLOF aiming Point, a fix , a lat/long indicated by point object, or a Rwy threshold that defines the point.
RoutePortion	startsAt	0..1	start	The starting SignificantPoint for the route portion.
SignificantPointInAirspace	isLocatedAt	0..1	location	The location of the SignificantPointInAirspace.
FlightConditionElementChoice		0..1	significantPointCondition	A condition based on a SignificantPoint.
DirectFlightSegment	endsAt	0..1	end	End point of a direct flight segment.
DirectFlightSegment	startsAt	0..1	start	Start of a direct flight segment.
FlightRoutingElementChoice		0..1	pointElement	Significant Point which is impacted by a flight restriction.
TerminalArrivalArea	isUsedForAngle	0..1	IAF	Initial Approach Fix. The starting point of the Initial Segment.
RoutePortion	passesThrough	0..1	intermediatePoint	The intermedia SignificantPoint for the route portion used to uniquely identify a route portion.
ChangeOverPoint	isLocatedAt	0..1	location	Location of the change over point.
SafeAltitudeArea	isBasedOn	0..1	centrePoint	The point used to build the Safe Altitude Area.
NavigationArea	isBasedOn	0..1	centrePoint	The point which the navigation area is based on.
RoutePortion	endsAt	0..1	end	The ending SignificantPoint for the route portion.
TerminalArrivalArea	isUsedForDistance	0..1	IF	The Intermediate fix. The ending point of the initial segment and the starting point of the intermediate segment.
FinalLeg	isAlignedBy	0..1	finalPathAlignmentPoint	A point defined by a latitude, longitude and MSL elevation used in conjunction with the LTP and the geometric center of the WGS-84 ellipsoid to define the vertical plane of a PA RNAV final approach course.

1 - Airspace Feature , 1 - Segment Points , 1 - Significant Points , 1 - Terminal Arrival Area , 1- Minimum and Emergency Safe Altitude , 2 - Airspace Associations , 2 - Flight restrictions - conditions , 2 - NavigationArea , 2 - Point Reference , 2 - Unplanned Holding , 3 - Flight restriction - routings , 3 - Route Portion , 4 - SegmentLegSpecialization , 5 - Route Portion Change Over Points