<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/2013/07/03/130703054443_afghan_war_taliban_624x351_ap.jpg>
<http://www.bbc.com/mundo/noticias/2014/07/140729_tecnologia_bala_cambia_direccion_ch.shtml>