<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/54ffce06a40d0-irobot20scooba20230.jpg>
<http://www.goodhousekeeping.com/institute/a24122/products-that-clean-while-you-sleep/>