<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/480x360/55004bae6a0cc-potato-potassium-zogxdc-lgn.jpg>
<http://www.goodhousekeeping.com/health/diet-nutrition/g2065/potassium-superfoods/?src=shelter_footer>