<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/2014/07/09/140709184657_high_school_students_624x351_reuters.jpg>
<http://www.bbc.com/mundo/noticias/2014/07/140708_eeuu_desigualdad_hispanos_mas_pronunciada_tsb.shtml>