<https://secure.gravatar.com/avatar/1a2271df8328c76bfc23814738c135b8?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://barghgostaran.com/blog/resetting-the-fire-alarm-system/>