<https://secure.gravatar.com/avatar/1c49766d658f4840f97097b1ec1d1f65?s=96&amp;d=wavatar&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.huisvlijt.com/wratten-vooral-overgedragen-op-school/>