<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/320x320/54feffe118012-bike-bellvela-0706-lgn.jpg>
<http://www.goodhousekeeping.com/health-products/bicycle-reviews/g482/bike-like-0606/>