<input type="submit" value="hint" name="param.action" />
          <input type="submit" value="match" name="param.action" />
          <input type="submit" value="elim" name="param.action" />
+         <input type="submit" value="instance" name="param.action" />
        </td>
        <td>   </td>
        <td>
 
   <input type="submit" value="hint" name="param.action" />
   <input type="submit" value="match" name="param.action" />
   <input type="submit" value="elim" name="param.action" />
+  <input type="submit" value="instance" name="param.action" />
   </td>
   <td valign="top" width="25%">
    <font size="-2">
 
   | "/hint" -> "Hint"
   | "/locate" -> "Locate"
   | "/elim" -> "Elim"
+  | "/instance" -> "Instance"
   | _ -> ""
 
   (* given a uri with a query part in input try to find in it a string
     let uris =
       match req#path with
       | "/match" -> MetadataQuery.match_term ~dbd term
+      | "/instance" -> MetadataQuery.instance ~dbd term
       | "/hint" ->
           let status = ProofEngineTypes.initial_status term metasenv in
           let intros = PrimitiveTactics.intros_tac () in
         end
     | "/hint"
     | "/elim"
+    | "/instance"
     | "/match" -> exec_action dbd req outchan
     | invalid_request ->
         Http_daemon.respond_error ~code:(`Status (`Client_error `Bad_request))