<https://secure.gravatar.com/avatar/ed669061974502d59b475dfcded29a93?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.advancedsecure.co.uk/digital-certificates-user-group-cardiff-castle/>