<xs:simpleType name="ItemUnitDescriptorCodeType">
  <xs:annotation>
    <xs:documentation>Fully adopted GS1 classifier: defines the hierarchical level of the trade item unit</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:pattern value="BASE_UNIT_OR_EACH"/>
    <xs:pattern value="CASE"/>
    <xs:pattern value="DISPLAY_SHIPPER"/>
    <xs:pattern value="MIXED_MODULE"/>
    <xs:pattern value="PACK_OR_INNER_PACK"/>
    <xs:pattern value="PALLET"/>
    <xs:pattern value="TRANSPORT_LOAD"/>
  </xs:restriction>
</xs:simpleType>