<https://secure.gravatar.com/avatar/48965f6a54c83cd1908f9849649b6a9a?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.miniserver.it/en/pfsense/ufs-compatibility-issue/>