CalDAV - Calendaring Extensions to [WebDAV], specified in [https://www.rfc-editor.org/rfc/rfc4918%|%RFC4918%|%]. See [dav] and [CalTasks]. A simplistic overview what CalDAV does was presented at [LEG%|%my%|%] talk at [EuroTcl2025], start with the following slide: https://jorge.at.anteris.net/tcl/EuroTcl2025/slides/dav.html