<https://secure.gravatar.com/avatar/d87725da22be7b58dbaf71048e3a7307?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://maurizio.mavida.com/2006/10/08/barcamp-torino-sabato-2-dicembre-2006/>