<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/54ff26c918c1a-eggs-vitamin-d-foods-lg.jpg>
<http://www.goodhousekeeping.com/health/diet-nutrition/g797/sources-of-vitamin-d-in-foods/?click=smart&kw=ist&src=smart&mag=GHK&link=-SMT-GHK>