<https://secure.gravatar.com/avatar/c9f7a0664fc9340b8f01f5d22d249c5b?s=96&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.e-service-online.com/big-data-la-nuova-era-dei-vantaggi-per-le-pmi-e-realta-2/>