How to get info from iTunes Store

how to get information/retrieve data from iTunes Store like this website?

http://app-store.appspot.com/?url=viewTVSeason%3Fid%3D388769641

After search on the net, I get clue that Apple/iTunes Store is n开发者_如何学运维ot provide API for its content, is it true?

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API Documentation

PDF http://www.apple.com/itunesaffiliates/API/AffiliatesSearch2.1.pdf

http://www.apple.com/itunes/affiliates/resources/blog/introduction---search-api.html

Example Request

http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/wa/wsSearch?term=jack+johnson&country=UK