<http://schema.org/thumbnail>
"http://ichef-1.bbci.co.uk/news/560/media/images/66420000/jpg/_66420083_c0121354-aids_virus-spl.jpg"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bbc.co.uk/news/science-environment-21806562>