<https://forum.motor1.com/topic/16861-quesito-%C3%A8-pi%C3%B9-importante/#comment-203267>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.motor1.com/topic/16861-quesito-%C3%A8-pi%C3%B9-importante/?tab=comments#comment-203294>