<https://www.italiamac.it/forum/topic/77122-gioco-della-linea-continua/page/3357/#comment-4293615>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.italiamac.it/forum/topic/77122-gioco-della-linea-continua/page/3357/?tab=comments#comment-4293615>