<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/76131000/jpg/_76131475_spreeuwstarlingimg_984222mei2013joukealtenburg.jpg>
<http://www.bbc.co.uk/news/science-environment-28216810>