<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
   <ogc:ClassifiedAs>
      <ogc:TypeName>csw:Record</ogc:TypeName>
      <ogc:ClassificationScheme>GetClass</ogc:ClassificationScheme>
      <ogc:ClassificationNode>/GeoClass/NorthAmerica/%/Ontario</ogc:ClassificationNode>
   </ogc:ClassifiedAs>
</ogc:Filter>