<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2012/11/21/121121121242_control_aeropuerto_224x280_thinkstock.jpg>
<http://www.bbc.com/mundo/noticias/2012/11/121121_tecnologia_programa_pasajeros_riesgo_aa.shtml>