<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/02/28/140228123540_russian_soldiers_304x171_ap.jpg>
<http://www.bbc.com/mundo/noticias/2014/02/140228_ucrania_claves_crisis_crimea_jp.shtml>