<https://secure.gravatar.com/avatar/9a09e1491d3777a4c3f8e2b9f256254d?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://qualitymant.com/el-ciclo-de-vida-de-los-activos-y-el-mantenimiento/>