<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/69049000/jpg/_69049278_22896_oneofcrossrail_stunnelboringmachines_tbm_.jpg>
<http://www.bbc.co.uk/news/magazine-23518137>