<https://aereawiki.com/corsi/acrobatica-aerea/spanset-hoop-2/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://aereawiki.com/corsi/acrobatica-aerea/spanset-hoop-2/lezioni/spanset-hoop-1-copy>