<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/2014/07/23/140723180919_playa_464x261_ap.jpg>
<http://www.bbc.com/mundo/ultimas_noticias/2014/07/140723_ultnot_san_francisco_playa_joven_arena_jg.shtml>