<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54ca5e5e3ffdc_-_string-trimmers-04-0712-lgn.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g107/electric-string-trimmers-we-test-7-of-the-best/>