<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/12/5509304161e59-lemons-cleaning-de-7041978.jpg>
<http://www.goodhousekeeping.com/home/cleaning/tips/a24885/make-at-home-cleaners/>