<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/2013/05/29/130529151333_bbc_vietnamese_forum_464x261_bbc_nocredit.jpg>
<http://bbcvietnamese.com/vietnamese/vietnam/2013/05/130529_forum_index_bbc_vietnamese.shtml>