<https://secure.gravatar.com/avatar/3e0c1ba892d9206e7b7e8bc0a0361a96?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sfia.it/catalogo-corsi-2/area-sicurezza-sul-lavoro/print-area-sicurezza-sul-lavoro/>