<xs:simpleType name="TokenMappingType" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:restriction base="xs:string">
    <xs:enumeration value="UNIQUE">
      <xs:annotation>
        <xs:documentation>
          <p xmlns="http://Hps.Exchange.PosGateway">This setting instructs the tokenization system to return a new, unique token value for the specified PAN. The returned token value is unique within the merchant’s token group. Some token formats result in a limited pool of unique and valid token values. For this reason, length and format-preserving token formats may not be supported for unique token mappings depending on the customer’s volume and token retention characteristics.</p>
        </xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="CONSTANT">
      <xs:annotation>
        <xs:documentation>
          <p xmlns="http://Hps.Exchange.PosGateway">This setting instructs the tokenization system to return a constant token value for the specified PAN. The returned token value is unique within the merchant’s token group, but the same token is always returned for a particular PAN.</p>
        </xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>