public static function getResourceRegistryByVersion($requestApiVersion)
 {
     switch ($requestApiVersion) {
         case 'v0':
             require_once 'resourceregistry/v0ResourceRegistry.class.php';
             self::$resourceRegistry = new v0ResourceRegistry();
             break;
         case 'v1':
             /*require_once 'resourceregistry/v1ResourceRegistry.php';
             		self :: $resourceRegistry = new v1ResourceRegistry();*/
             break;
         default:
             require_once 'exceptions/UnsupportedApiVersionException.class.php';
             throw new UnsupportedApiVersionException("Only 'v0' version supported");
             break;
     }
     return self::$resourceRegistry;
 }