<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/320x408/5500212a41174-eye-chart-vitamina-lg.jpg>
<http://www.goodhousekeeping.com/health/diet-nutrition/g1768/vitamin-a-44010609/?src=shelter_footer>