public function getData($key, $registry = null)
	{
		if ($registry == null) {
			$registry = $this->default;
		}
		if (is_string($key . $registry) && $this->registryExists($registry)) {
			if (array_key_exists($key, $this->data[self::REGISTRY][$registry])) {
				return $this->data[self::REGISTRY][$registry][$key];
			}
		}
		return null;
	}