<https://blog.solignani.it/2000/05/10/connessioni-a-provider%e2%80%a6-remoti/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.solignani.it/2000/05/10/connessioni-a-provider%E2%80%A6-remoti/>