<simpleType name="MixingTypeEnumType">
  <union>
    <simpleType>
      <restriction base="string">
        <enumeration value="dry mixing"/>
        <enumeration value="slurry mixing"/>
        <enumeration value="single fluid jet"/>
        <enumeration value="double fluid jet"/>
        <enumeration value="triple fluid jet"/>
      </restriction>
    </simpleType>
    <simpleType>
      <restriction base="string">
        <pattern value="Other: .{2,}"/>
      </restriction>
    </simpleType>
  </union>
</simpleType>