<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54d0e8acd0205_-_engine_cleaning_26_0810-md.jpg>
<http://www.popularmechanics.com/cars/how-to/a6008/how-to-clean-an-engine/>