<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/980x1306/54ff67fdd689f-03-ghk-cleaning-your-cleaners-vacuum-cleaner-s2.jpg>
<http://www.goodhousekeeping.com/health/fitness/g1325/calorie-burning-winter-activities/>