Valid search indices for the us locale and the browsenode operation.
The default value is Books, unless mode is specified.
The list of available values are:
Apparel Automotive Baby Beauty Books Classical DVD DigitalMusic Electronics GourmetFood HealthPersonalCare HomeGarden Industrial Jewelry Kitchen Magazines Merchants Miscellaneous Music MusicalInstruments OfficeProducts OutdoorLiving PCHardware PetSupplies Photo SilverMerchants Software SportingGoods Tools Toys UnboxVideo VHS Video VideoGames Wireless WirelessAccessories