crd:posAngleReferenceType 

Position angles may be counted from North (through East), (positive) X (to positive Y), or (positive) Y (to positive X) axis

Simple Type Information

Used By

Attribute crd:posAngleType/@reference

Source 

<xs:simpleType name="posAngleReferenceType">
  <xs:annotation>
    <xs:documentation>Position angles may be counted from North (through East), (positive) X (to positive Y), or (positive) Y (to positive X) axis</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:enumeration value="North"/>
    <xs:enumeration value="X"/>
    <xs:enumeration value="Y"/>
  </xs:restriction>
</xs:simpleType>