<https://secure.gravatar.com/avatar/237ab41188ecdeca564c7474ffb91a63?s=96&amp;d=mm&amp;r=pg>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.112hardenberg.nu/opsporing-verzocht-levert-vier-tips-op/>