<http://schema.org/description>
"As the prices of apps have fallen towards free, many developers have turned to either freemium or ad-supported business models. While many of these apps are simply crapware, there are ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apple/2012/11/30/what-happens-when-an-ad-in-an-app-is-too-good/>