<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/480x552/54ff15d6d8e08-0312-whirlpool-refrigerator-filter-xl.jpg>
<http://www.goodhousekeeping.com/health-products/g684/water-filters/?click=main_sr>