<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/05/13/130513152522_cerveza_norcoreana_304x171_josepha.ferris.jpg>
<http://www.bbc.com/mundo/noticias/2013/05/130513_tecnologia_cerveza_corea_norte_aa.shtml>