<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/75565000/jpg/_75565572_retinitis_pigmentosa_fundus_camera_image-spl-1.jpg>
<http://www.bbc.com/news/health-27768890>