<https://www.kropf-multimedia.ch/contents/de-ch/Product-P42556>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.kropf-multimedia.ch/contents/de-ch/d45764_Fotozubehoer-zu-Sony-A7R-III-ILCE-7RM3.html>