<http://schema.org/thumbnail>
"http://media.cnlive.it/wp-content/uploads/2015/01/2985902006001_3800767925001_video-still-for-video-3800889295001-400x221.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cnlive.it/news/2014/09/23/emma-watson-allonu-parita-genere.html>