public function content($arg=null)
	{
		switch($this->format)
		{
			case 'json':
				if(!isset($arg))
				{
					$arg = false;
				}
				return $this->json($arg);
				break;
			case 'xml' :
				if(!isset($arg))
				{
					$arg = 'dom';
				}
				return $this->xml($arg);
				break;
			default :
				return $this->getContent();
				break;
		}
	}