 <code>shipping_cost</code> field has a value less then that number.
 </p>

 <p>
 A similar use case would be to combine the switch parser with the bbox parser to 
 support an optional geographic filter that is applied if and only if the client 
 specifies a <code>location</code> param containing a lat,lon pair to be used as 
 the center of the bounding box:
 </p>
 <pre class="prettyprint">
 &lt;requestHandler name="/select" class="solr.SearchHandler"&gt;
   &lt;lst name="invariants"&gt;
     &lt;str name="