<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/2013/04/130412_ultnot_bbc_transmitira_extracto_cancion_anti_thatcher.shtml>