Write an iPhone application

From 3 different XML files on a FTP server create an app that only does following when the user supplies the product number: - gives the available stock in all available colors - gives his price - gives him the printing options on that product For example He requests product 1234567 The app should tell him - the product is a plastic pen - the colors are black - white - red - stock in black 400 - white 500 - red 900 - standard price per piece blank = 1,00 and decorated 1 color = 1,25