<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/06/27/130627163130_chocolate_info.jpg>
<http://www.bbc.com/mundo/noticias/2013/07/130627_ecuador_chocolate_cacao_finde.shtml>