to the specific 
 set of legal values (<code>shipping=any|free</code>, 
 <code>in_stock=yes|no|all</code>).  
 </p>

 <pre class="prettyprint">
 &lt;requestHandler name="/select" class="solr.SearchHandler"&gt;
   &lt;lst name="defaults"&gt;
     &lt;str name="in_stock"&gt;yes&lt;/str&gt;
     &lt;str name="shipping"&gt;any&lt;/str&gt;
   &lt;/lst&gt;
   &lt;lst name="appends"&gt;
     &lt;str name="fq"&gt;{!switch case.all='*:*'
                             case.yes='inStock:true'
                          