<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/2011/06/14/110614111645_8091_466_2.gif>
<http://www.bbc.com/mundo/noticias/2016/02/160217_mar_meridional_china_islas_misiles_amv>