<http://schema.org/image>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2012/07/103565845_f0f9173dea_z-520x245.jpg>
<http://thenextweb.com/google/2012/07/02/google-improves-search-by-image-now-includes-knowledge-graph-in-results/>