<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://gioit.h-cdn.co/assets/16/16/980x1470/1461269665-hbz-vintage-paris-1900-gettyimages-92387609.jpg>
<http://www.gioia.it/idee/viaggi/news/g498/parigi-vintage-foto-bianco-nero/>