Non-zero, non-infinite float

Is this the best way to define a non-zero, non-infinite float?

 <simpleType name="nonZeroNonInfiniteFloat">
  <union>
   <simpleType>
    <restriction base="float">
     <minExclusive value="0"/>
     <maxExclusive value="INF"/>
    </restriction>
   </simpleType>
   <simpleType>
    <restriction base="float">
     <minExclusive value="-INF"/>
     <maxExclusive value="-0"/>
    </restriction>
   </simpleType>
  </union>
 </simpleType>

Thanks

Hugh

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