<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/59701000/jpg/_59701364_t1100691-oil_plant_settling_pond-spl.jpg>
<http://www.bbc.co.uk/news/science-environment-17741416>