<https://secure.gravatar.com/avatar/5675c5a2fc8ed20f3ae8cbb7aa37eaf7?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://artigos.etc.br/como-o-estudo-dos-fundamentos-da-ead-podera-subsidiar-suas-praticas-nos-projetos-de-cursos-a-distancia.html>