<http://schema.org/description>
"Shoppers in the US will soon see ratings in Google's Product Listing Ads, as the search giant looks to lure more companies on board with the promise of better click-throughs.\r\n\r\nWhile ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2014/07/29/google-brings-ratings-product-listing-ads-blurring-lines-organic-paid-search/gadz/>