<xs:simpleType name="RetrievalMethodEnumType">
  <xs:annotation>
    <xs:documentation>The RetrievalMethodEnumType enumerates values that describe methods of retrieving a single point from a set of points in a cylindrical acceptance window. AVERAGE will average all points within the window. MAXEXTREME will retrieve the single point furthest in the direction of the cylinder's axis. MINEXTREME will retrieve the single point furthest against the direction of the cylinder's axis, CLOSEST1D will retrieve the single point closest to the cylinder center point along the cylinder's axis without regard to the perpendicular distance from the cylinder's axis. CLOSEST2D will retrieve the single point closest to the cylinder's axis without regard to the distance up or down the axis from the cylinder center point. CLOSEST3D will retrieve the single point closest to the cylinder's center point in three dimensions.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="AVERAGE"/>
    <xs:enumeration value="MAXEXTREME"/>
    <xs:enumeration value="MINEXTREME"/>
    <xs:enumeration value="CLOSEST1D"/>
    <xs:enumeration value="CLOSEST2D"/>
    <xs:enumeration value="CLOSEST3D"/>
  </xs:restriction>
</xs:simpleType>