<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/2016/03/20/160320190702_banderas_eeuu_cuba_624x351_epa_nocredit.jpg>
<http://www.bbc.com/mundo/noticias/2016/03/160320_obama_visita_cuba_habana_all>