<http://schema.org/description>
"The Kindle app for iOS has just gained one of the best features of the hardware Kindle devices in X-Ray, the subtext service that gives you contextual info on the book you're reading ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apps/2012/10/24/kindle-app-for-ios-gets-cool-x-ray-feature-but-just-for-textbooks-with-japanese-support-and-more/>