True ("true" or "1") indicates that the well surface point is the origin of this CRS. False ("false" or "0") or not given indicates otherwise. A pointer to the reference point that is the origin of this CRS. A textual description of the origin. The angle of the Y axis from North (as described in attribute northDirection). Defaults to zero. Positive clockwise. A free-form description of the Y axis. Examples would be 'parallel to the west side of the platform', or 'along the main entry road'. True ("true" or "1") indicates that the X axis is rotated counter-clockwise from the Y axis when viewed from above the earth looking down. False ("false" or "0") or not given indicates a clockwise rotation. Generally the X axis is rotated clockwise.