Example Record Query Request File To Filter Null Value Attribute

<ns:Context>
  <ns:Variable name="SUPPRESS_NULL_EMPTY_ATTRIBUTES" type="string">true</ns:Variable>
</ns:Context>
<ns0:Transaction>
    <ns0:Command type="Query">
     <ns0:MaxCount>10</ns0:MaxCount>
     <ns0:MasterCatalogRecord etype="Entity">
        <ns0:ExternalKeys>
          <ns0:Key name="MASTERCATALOGNAME">APPLIANCES</ns0:Key>
          <ns0:Key name="PRODUCTID">a</ns0:Key>
        </ns0:ExternalKeys>
     </ns0:MasterCatalogRecord>
    </ns0:Command>
</ns0:Transaction>