<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/60988000/jpg/_60988750_c0090748-sayano-shushenskaya_hydroelectric_dam-spl.jpg>
<http://www.bbc.com/news/science-environment-18353963>