<xs:simpleType name="CoordinateEnumType">
  <xs:annotation>
    <xs:documentation>The CoordinateEnumType enumerates values that describe a coordinate system. CARTESIAN_2D is a two dimensional Cartesian coordinate system with orthogonal X and Y axes. POLAR_2D is a two dimensional polar coordinate system with a radius from the origin and an angle from a starting direction. CARTESIAN_3D is a three dimensional right handed Cartesian coordinate system with orthogonal X, Y, and Z axes. CYLINDRICAL_3D is a three dimensional cylindrical coordinate system with a polar coordinate system where the XY Cartesian plane would be plus height. SPHERICAL_3D is a three dimensional spherical coordinate system with an axis perpendicular to a plane at the origin. It has a radius extending from the origin, an angle that is the angle between the radius and the axis, and an angle that is the angle between a starting direction in the plane and the projection of the radius on the plane.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="CARTESIAN_2D"/>
    <xs:enumeration value="POLAR_2D"/>
    <xs:enumeration value="CARTESIAN_3D"/>
    <xs:enumeration value="CYLINDRICAL_3D"/>
    <xs:enumeration value="SPHERICAL_3D"/>
    <xs:enumeration value="UNDEFINED"/>
  </xs:restriction>
</xs:simpleType>