<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/07/01/140701113648_bebes_foca2_304x171_thinkstock.jpg>
<http://www.bbc.com/mundo/noticias/2014/07/140701_ciencia_ternura_bebes_mamiferos_np.shtml>