<http://schema.org/description>
"Almost two months after Amazon first announced it, the Kindle MatchBook service has now officially been launched in the US, letting you purchase discounted ebook equivalents of the ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/media/2013/10/29/amazons-kindle-matchbook-service-goes-live-discounting-ebooks-physical-books-youve-already-bought/>