<http://schema.org/url>
<http://www.bbc.com/mundo/noticias/2014/04/140423_tecnologia_twitter_nypd_policia_nueva_york_rg>
<http://www.bbc.com/mundo/noticias/2014/04/140423_tecnologia_twitter_nypd_policia_nueva_york_rg.shtml>