<http://schema.org/thumbnailUrl>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2011/05/oedpassion-769022-520x245.jpg>
<http://thenextweb.com/google/2011/05/13/google-updates-its-definitions-service-makes-it-a-lot-more-useful/>