<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/480x552/54ebc028745c5_-_05-sweet-potatoes-pan-xl.jpg>
<http://www.womansday.com/health-fitness/nutrition/advice/g1275/most-nutritious-vegetables/>