<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2012/10/25/121025170729_pez2_304x171_ap_nocredit.jpg>
<http://www.bbc.com/mundo/noticias/2012/10/121025_pez_arquero_am.shtml>