<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/2013/07/12/130712225237_sp_mercosul_ap_304x171_ap_nocredit.jpg>
<http://www.bbc.com/mundo/noticias/2014/06/140620_cumbre_alianza_pacifico_msd.shtml>