<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/2013/12/04/131204111716_chengdu_304x171_pa.jpg>
<http://www.bbc.com/zhongwen/simp/china/2013/12/131204_cameron_chengdu.shtml>