<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/768x516/54ebbe00320a3_-_4-sweet-potatoes-xl.jpg>
<http://www.womansday.com/food-recipes/cooking-tips/tips/g1250/food-facts/?src=shelter_footer>