<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eb4ba38c3bb_-_whats-it-worth-modular-bookcase-0112-lgn.jpg>
<http://www.countryliving.com/shopping/antiques/g1098/what-its-worth/>