/**
  * Determine layout, cached.
  *
  * @return  xp.scriptlet.WebLayout
  */
 private function determineLayout()
 {
     if (null === $this->layout) {
         $ini = new Path($this->webroot, WebConfiguration::INI);
         if ($ini->exists()) {
             $this->layout = new WebConfiguration(new Properties($ini->toString()), $this->config);
         } else {
             $ini = new Path($this->webroot, 'etc', WebConfiguration::INI);
             if ($ini->exists()) {
                 $this->layout = new WebConfiguration(new Properties($ini->toString()), $this->config);
             } else {
                 $this->layout = new ServeDocumentRootStatically();
             }
         }
     }
     return $this->layout;
 }