<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://gioit.h-cdn.co/assets/16/27/640x1138/1467957761-syn-xxx-1467919818-img-2641.png>
<http://www.gioia.it/magazine/personaggi/news/a1163/kate-middleton-serena-williams-snapchat/>