An association role to the coordinate system used by this CRS.
<gml:coordinateSystem xlink:href="" nilReason="" xmlns:gml="http://www.opengis.net/gml/3.2"> <gml:AbstractCoordinateSystem aggregationType="" gml:id="">{1,1}</gml:AbstractCoordinateSystem> </gml:coordinateSystem>
<element name="coordinateSystem" type="gml:CoordinateSystemPropertyType"> <annotation> <documentation>An association role to the coordinate system used by this CRS.</documentation> </annotation> </element>