<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/54eae46a6d52f_-_what-s-worth-buying-in-bulk-mdn.jpg>
<http://www.womansday.com/life/work-money/tips/a2089/whats-worth-buying-in-bulk-113191/>