<xs:simpleType name="distanceType">
  <xs:annotation>
    <xs:documentation>The distance unit (can be meters, us_feet, int_feet, us_feet_inches, int_feet_inches, us_chains, int_chains, mile, int_inches, us_inches, millimeters, centimeters, kilometers, microinches, mils, int_yards, us_yards, angstroms, nanometers, microns, decimeters, decameters, hectometers, gigameters, astronomical_units, light_years or parsecs)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="meters"/>
    <xs:enumeration value="us_feet"/>
    <xs:enumeration value="int_feet"/>
    <xs:enumeration value="us_feet_inches"/>
    <xs:enumeration value="int_feet_inches"/>
    <xs:enumeration value="us_chains"/>
    <xs:enumeration value="int_chains"/>
    <xs:enumeration value="mile"/>
    <xs:enumeration value="int_inches"/>
    <xs:enumeration value="us_inches"/>
    <xs:enumeration value="millimeters"/>
    <xs:enumeration value="centimeters"/>
    <xs:enumeration value="kilometers"/>
    <xs:enumeration value="microinches"/>
    <xs:enumeration value="mils"/>
    <xs:enumeration value="int_yards"/>
    <xs:enumeration value="us_yards"/>
    <xs:enumeration value="angstroms"/>
    <xs:enumeration value="nanometers"/>
    <xs:enumeration value="microns"/>
    <xs:enumeration value="decimeters"/>
    <xs:enumeration value="decameters"/>
    <xs:enumeration value="hectometers"/>
    <xs:enumeration value="gigameters"/>
    <xs:enumeration value="astronomical_units"/>
    <xs:enumeration value="light_years"/>
    <xs:enumeration value="parsecs"/>
  </xs:restriction>
</xs:simpleType>