<http://schema.org/image>
<http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2011/02/Image-by-Joe-Lanman-via-Flickr-Creative-Commons-520x245.png>
<http://thenextweb.com/google/2011/02/23/google-calendar-users-suffering-missing-data/>