<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54cac0f876dd7_-_vacuum_abusive_lab_test_0311-de.jpg>
<http://www.popularmechanics.com/technology/gadgets/reviews/a11790/bagless-upright-vacuum-cleaner-comparison-test/>