<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/2014/04/07/140407114552_bartomeu_464x261_afp.jpg>
<http://www.bbc.com/mundo/blogs/2014/04/140407_blog_de_lalo_antigona_cule.shtml>