<https://forums.FreeBSD.org/threads/how-to-make-the-laptop-sleep-when-lid-is-closed.6942/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forums.freebsd.org/threads/how-to-make-the-laptop-sleep-when-lid-is-closed.6942/page-2#post-363121>