/** {@inheritDoc} */
 public boolean parseUnrecognizedElement(Element element, Properties props) throws Exception {
   if ("connectionSource".equals(element.getNodeName())) {
     Object instance = DOMConfigurator.parseElement(element, props, ConnectionSource.class);
     if (instance instanceof ConnectionSource) {
       ConnectionSource source = (ConnectionSource) instance;
       source.activateOptions();
       setConnectionSource(source);
     }
     return true;
   }
   return false;
 }