Name	Data Type	Definition
name	TextNameType	The name or designator used to identify an apron at an airport/heliport which has more than one apron.
abandoned	CodeYesNoType	An indicator that an apron is no longer in operational use, but it is still physically present and visible, although usually in a degraded state.

Association	Multiplicity	Role	To	Role description
isSituatedAt	0..1	associatedAirportHeliport	AirportHeliport
hasSurfaceDescribedBy	0..1	surfaceProperties	SurfaceCharacteristics	The surface characteristics of the apron.
isOperationalBy	0..*	availability	ApronAreaAvailability	The operational status of the Apron.
hasAnnotations	0..*	annotation	Note
isContaminated	0..*	contaminant	ApronContamination	Apron contaminant.

From	Association	Multiplicity	Role	To	Role description
ApronLightSystem	isProvidedFor	0..1	lightedApron	The apron lighted by the ApronLightSystem
ApronMarking	isMarkedOn	0..1	markedApron	The Apron marke by the ApronMarking
ApronElement	describesPartOf	0..1	associatedApron	The Apron that is associated with the ApronElement.
GuidanceLine	connects	0..*	connectedApron	Apron connected by the Guidance Line.
DeicingArea	isLocatedOn	0..1	associatedApron	Apron associated with the DeicingArea.

1 - Apron , 1 - Surface Contamination , 1 - Surface Marking , 2 - AirportHeliport Association , 2 - Guidance Line , 2 - Surface Lighting Elements , 3 - Runway Operational Point , 5 - Apron Area Availability