<http://schema.org/image_url>
"http://media.al.com/nightlife/photo/thomas-function-vert-housejpg-9c39ebe4ea47cf9a.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://blog.al.com/nightlife/2010/06/whats_the_perfect_time_of_nigh.html>