<https://vwi.org/mein-kalender/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://vwi.org/mein-kalender/?yr=2020&time=week&cid=my-calendar&format=calendar&dy=04&month=05&mcat=all,2,6,4,3>