<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/55437000/jpg/_55437620__51475569_m865136-coloured_sem_of_a_prostate_cancer_cell-spl-1.jpg>
<http://www.bbc.co.uk/news/uk-wales-politics-17105899>