<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/65834000/jpg/_65834397_e6700037-aerial_view_of_meteor_crater,_arizona-spl.jpg>
<http://www.bbc.co.uk/news/science-environment-21413066>