<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://gioit.h-cdn.co/assets/16/16/980x980/1461269678-hbz-vintage-paris-1950-gettyimages-3067131.jpg>
<http://www.gioia.it/idee/viaggi/news/g498/parigi-vintage-foto-bianco-nero/>