--- a/directmapping-webapp/src/main/scala/Servlet.scala	Wed Feb 02 16:18:13 2011 -0500
+++ b/directmapping-webapp/src/main/scala/Servlet.scala	Wed Feb 02 18:55:59 2011 -0500
@@ -31,9 +31,10 @@
   val encoding = "utf-8"
 
   override def doPost(request:HttpServletRequest, response:HttpServletResponse) = {
+    val hierarchy = request.getParameter("hierarchy") == "on"
     request.getParameter("sql") match {
       case null | "" => processIndex(request, response)
-      case sql       => processSQL(request, response, sql)
+      case sql       => processSQL(request, response, sql, hierarchy)
     }
   }
 
@@ -55,7 +56,8 @@
         { if (result isDefined) <pre name="result" id="result">{ result.get }</pre> }
         <form method="POST" action="/">
           <p>
-            <textarea rows="15" cols="80" name="sql" id="sql">{ sql }</textarea>
+            <textarea rows="15" cols="80" name="sql" id="sql">{ sql }</textarea><br />
+            <input name="hierarchy" checked="checked" type="checkbox" />Detects hierarchy relation
             <input type="submit" value="submit SQL" />
           </p>
         </form>
@@ -66,12 +68,12 @@
       </body>
     </html>
 
-  def processSQL(request:HttpServletRequest, response:HttpServletResponse, sql:String) {
+  def processSQL(request:HttpServletRequest, response:HttpServletResponse, sql:String, hierarchy:Boolean) {
 
     val result =
       try {
         val db = SQLParser.toDB(sql)
-        DirectMapping.HierarchyDetection = true
+        DirectMapping.HierarchyDetection = hierarchy
         val computedGraph:Graph = directDB(db)
         jenaSerializer(computedGraph)
       } catch {