<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/2014/10/22/141022110313_refresco_624x351_thinkstock.jpg>
<http://www.bbc.com/mundo/noticias/2015/07/150731_salud_cuanto_azucar_consumimos_sin_darnos_cuenta_ig>