<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/68087000/jpg/_68087066_c0062678-steel_works_in_hangdang,_china-spl.jpg>
<http://www.bbc.com/news/science-environment-22841356>