<https://secure.gravatar.com/avatar/6a8ea26d33b32704838ca5dc0e325202?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.neocekavanydychanek.cz/bezproblemova-komunikace-s-datovou-schrankou/>