<http://schema.org/image_url>
"http://media.masslive.com/mass_river_worcester_news/photo/ecotarium-abf44aa4237a1ba2.png"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.masslive.com/news/worcester/index.ssf/2013/08/ecotarium_offers_free_admissio.html>