<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/71139000/jpg/_71139422_c0157665-coast_live_oak,_quercus_agrifolia.jpg>
<http://www.bbc.com/news/health-24957089>