<https://secure.gravatar.com/avatar/c2652c6a176b3467496edddba7e1a1fb?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.yourelectricalguide.com/2023/09/3d-solar-cell-systems.html>