<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/54321000/jpg/_54321667_xiaotingia_reconstruction_xing_lida_and_liu_yi.jpg>
<http://www.bbc.com/news/science-environment-14307985>