<https://secure.gravatar.com/avatar/5e58ed0fca76d6c6b22624748931dc1b?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://locatronic.com.br/blog/escolas-e-creches-adotam-sistema-de-seguranca-para-monitoramento/>