<https://secure.gravatar.com/avatar/7e2f873bab482a87577bce4a3c683239?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://aela.es/reflexiones/con-el-tiempo-todo-se-descubre/>