<http://schema.org/description>
"Just as FarmVille is giving away free Spring Mystery Boxes to users who purchase Game Cards from now until April 24, so too is FrontierVille offering users a prize for doing the same (although you"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.aol.com/article/2011/04/11/redeem-frontierville-game-card-receive-free-easter-mystery-crat/19909833/>