<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/08/14/130814023414_sp_kerry_patriota_304x171_afp.jpg>
<http://www.bbc.com/mundo/noticias/2013/08/130822_tecnologia_brasil_snowden_eeuu_dp.shtml>