<xs:simpleType name="temperatureType">
  <xs:annotation>
    <xs:documentation>The temperature units (can be fahrenheit or celsius)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="fahrenheit"/>
    <xs:enumeration value="celsius"/>
  </xs:restriction>
</xs:simpleType>