<http://schema.org/thumbnail>
"http://cdn-s3.si.com/s3fs-public/videos/2157889318001_3699114505001_SammyWatkins.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/nfl/video/2014/07/27/bills-sammy-watkins-making-it-look-easy>