<https://libra-mente.com/sette-blog-per-un-autorem-d-frostern-con-la-terza-perla>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://libra-mente.com/sette-blog-per-un-autorem-d-frostern-con-la-terza-perla>