<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/06/05/140605174248_oprah_winfrey_464x261_ap.jpg>
<http://www.bbc.com/mundo/noticias/2014/06/140605_vert_cap_malos_consejos_laborales_yv.shtml>