<xs:simpleType name="LogarithmicPowerRatioUom">
  <xs:restriction base="eml:UomEnum">
    <xs:enumeration value="B">
      <xs:annotation>
        <xs:documentation>bel</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="dB">
      <xs:annotation>
        <xs:documentation>decibel</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>