protected function handleSubdirectives(array $data, $arg)
	{
		if (count($data) <= 1)
		{
			return $arg;
		}

		// remove base directive

		array_shift($data);

		// call handler for each filter

		foreach ($data as $value)
		{
			$arg = $this->handlers_filters->call($value, $arg);
		}

		return $arg;
	}