<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/71951000/jpg/_71951406_c0155612-ash_fraxinus_excelsior_tree-spl(1).jpg>
<http://www.bbc.co.uk/news/science-environment-24169859>