<http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>
<http://www.bbc.com/mundo/ultimas_noticias/2014/09/140902_ultnot_somalia_shabab_estados_unidos_ig.shtml>