<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/2014/08/05/140805113703_google1_304x171_gettyimages.jpg>
<http://www.bbc.com/mundo/noticias/2014/08/140805_google_pornografia_gmail_am.shtml>