<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/69275000/jpg/_69275337_c0107912-cervical_cancer_cells,_sem-spl.jpg>
<http://www.bbc.co.uk/news/health-23665996>