<http://schema.org/ratingValue>
"5,00"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.businessonline.it/news/46367/tfa-terzo-ciclo-decreto-scuola-nuove-misure-al-voto-e-mobilita-con-ulteriori-spiegazioni-ufficiali.html>