<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/15/43/980x490/gallery-1445626977-ghk-1115-sweet-potato-croquettes.jpg>
<http://www.goodhousekeeping.com/food-recipes/g657/sweet-potato-recipes/>