<https://www.isotools.org/evento/nueva-iso-45001-sustituta-ohsas-18001/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.isotools.org/evento/novedades-iso-45001-sistemas-gestion-y-seguridad-trabajo-es14jul16/>