<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/70938000/jpg/_70938705_t1100306-night_view_of_an_oil_refinery-spl.jpg>
<http://www.bbc.com/news/science-environment-24833148>