<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/71693000/jpg/_71693146_m1340336-coloured_x-ray_showing_lung_cancer-spl.jpg>
<http://www.bbc.co.uk/news/health-26014693>