<https://secure.gravatar.com/avatar/3a0cd329d0c8a46ed0932c160c5eec5b?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://rexel.be/productnieuws/siemens-communicatie-en-meetfuncties/>