<xs:element name="result">
  <xs:annotation>
    <xs:documentation>Operation result</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="success"/>
      <xs:enumeration value="partial"/>
      <xs:enumeration value="failure"/>
    </xs:restriction>
  </xs:simpleType>
</xs:element>