<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/images/stories/2010/06/ibooks-hero-20100607.png?itok=kH0_c0yf>
<http://www.imore.com/apple-updates-ibooks-ipad-iphone-adds-notes-bookmarks-pdf-support>