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"Today, those of us who are paying attention to the Internet have seen a story about Apple rejecting an app for integrating a third-party payment system.  That third-party system is ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apple/2012/05/28/duh-apple-doesnt-want-flattr-money-flowing-through-its-apps-if-it-cant-take-a-cut/>