<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/2013/07/09/130709123429_bogota_304x171_reuters.jpg>
<http://www.bbc.com/mundo/blogs/2013/07/130709_blog_editores_semana_intensa.shtml>