<https://aereawiki.com/corsi/acrobatica-aerea/dynamic-hoop-3/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://aereawiki.com/corsi/acrobatica-aerea/dynamic-hoop-3/lezioni/dynamic-hoop-2-copy>