<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/54eae4699c40d_-_03-what-s-worth-buying-in-bulk.jpg>
<http://www.womansday.com/life/work-money/tips/a2089/whats-worth-buying-in-bulk-113191/>