<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/56196000/jpg/_56196021_m1340336-coloured_x-ray_showing_lung_cancer.jpg>
<http://www.bbc.co.uk/news/health-17960215>