<https://secure.gravatar.com/avatar/c9749ce8c9e180e5e69fb7ac222a7c8e?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://defeijenoorder.nl/2017/08/16/gezocht-organisator-klaverjas-toernooi/>