<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/05/09/140509081145_reloj_304x171_ap_nocredit.jpg>
<http://www.bbc.com/mundo/blogs/2014/05/140516_blog_editores_relojes_felices_ms.shtml>