<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/58660000/jpg/_58660492_m1320334-immunofluorescent_lm_of_melanoma_cancer_cells-spl.jpg>
<http://www.bbc.co.uk/news/health-17128925>