<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://del.h-cdn.co/assets/cm/15/10/54f68be2dce28_-_ea101428_0705_cheeseburger_sxl-2.jpg>
<http://www.delish.com/cooking/g2117/ground-beef-recipes-021709/>