<https://secure.gravatar.com/avatar/cd770b2563810a7f5e64adde16215388?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.impulsadesarrollo.com/2020/03/20/hacer-sin-hacer/>