<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/75866000/jpg/_75866730_t1520625-solar_panels_on_city_hall,_london,_uk-spl.jpg>
<http://www.bbc.com/news/science-environment-28041525>