<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/54ffc31f10e2a-ghk-blog-greenies2.jpg>
<http://www.goodhousekeeping.com/institute/a23640/pet-dental-health-and-greenies/?src=shelter_footer>