<https://blog.iplace.com.uy/categorias/mac/mac-2/conociendo-el-mac/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.iplace.com.uy/2015/07/06/aprenda-a-habilitar-o-dark-mode-no-seu-os-x-yosemite/>