<complexType name="MeasureType">
    <annotation>
      <documentation>Number with a scale.  
      The value of uom (Units Of Measure) attribute is a reference to a Reference System for the amount, either a ratio or position scale. </documentation>
    </annotation>
    <simpleContent>
      <extension base="double">
        <attribute name="uom" type="anyURI" use="required"/>
      </extension>
    </simpleContent>
  </complexType>