public static function getValidValues()
{
return array(self::VALUE_SPELL, self::VALUE_WEB, self::VALUE_IMAGE, self::VALUE_RELATED_SEARCH, self::VALUE_PHONEBOOK, self::VALUE_SHOWTIMES, self::VALUE_WEATHER, self::VALUE_VIDEO, self::VALUE_AD, self::VALUE_XRANK, self::VALUE_INSTANT_ANSWER, self::VALUE_NEWS, self::VALUE_QUERY_LOCATION, self::VALUE_MOBILE_WEB, self::VALUE_TRANSLATION);
}