<https://blog.aspiration.marketing/es/what-is-user-generated-content-ugc-and-how-can-i-make-use-of-it>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.aspiration.marketing/es/what-is-user-generated-content-ugc-and-how-can-i-make-use-of-it>