Magnetic Link hat Probleme mit doppelten http:// Paaren
Try putting
http%3A%2F%2Fcorrespsearch.bbaw.de%2Fapi%2Fv1%2Fkml.xql%3Fcorrespondent%3Dhttp%3A%2F%2Fd-nb.info%2Fgnd%2F118540238%26startdate%3D1793-01-01%26enddate%3D1808-02-02
in via KML File URL, and then try the magnetic Link
Doesn't work! Please check!