<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/ws/560/amz/worldservice/live/assets/images/2013/02/14/130214122318_john_mccain_vietnam_304x171_afp.jpg>
<http://www.bbc.com/vietnamese/vietnam/2013/03/130315_mccain_wsj.shtml>