<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2014/04/23/140423075325_liaoning_464x261_reuters_nocredit.jpg>
<http://www.bbc.com/vietnamese/world/2014/04/140423_china_elephant_in_the_room.shtml>