<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="PQ">
      <xs:annotation>
         <xs:documentation>
            A dimensioned quantity expressing the result of a
            measurement act.
        </xs:documentation>
         <xs:appinfo>
            <diff>PQ</diff>
         </xs:appinfo>
      </xs:annotation>
      <xs:complexContent>
         <xs:extension base="QTY">
            <xs:sequence>
               <xs:element maxOccurs="unbounded" minOccurs="0" name="translation" type="PQR">
                  <xs:annotation>
                     <xs:documentation>
                        An alternative representation of the same physical
                        quantity expressed in a different unit, of a different
                        unit code system and possibly with a different value.
                     </xs:documentation>
                  </xs:annotation>
               </xs:element>
            </xs:sequence>
            <xs:attribute name="value" type="real" use="optional">
               <xs:annotation>
                  <xs:documentation>
                     The magnitude of the quantity measured in terms of
                     the unit.
                  </xs:documentation>
               </xs:annotation>
            </xs:attribute>
            <xs:attribute default="1" name="unit" type="cs" use="optional">
               <xs:annotation>
                  <xs:documentation>
                     The unit of measure specified in the Unified Code for
                     Units of Measure (UCUM)
                     [http://aurora.rg.iupui.edu/UCUM].
                  </xs:documentation>
               </xs:annotation>
            </xs:attribute>
         </xs:extension>
      </xs:complexContent>
   </xs:complexType>