<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/61705000/jpg/_61705015_c0119851-salt_content_in_bread,_conceptual_image.jpg>
<http://www.bbc.co.uk/news/health-21685022>