<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/04/16/130416132532_acv_304x171_pa.jpg>
<http://www.bbc.com/portuguese/noticias/2013/07/130711_cinco_conselhos_viver_mais_fn.shtml>