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XMP (including file naming scheme) is an ISO Standard (16684-1), so there is no room for flexibility. Yes, it could result into file naming conflict if you have, for example, filename.CR2 and filename.TIF in same folder and want to use sidecar files for both files. To specify exact extension, XMP uses special photoshop:SidecarForExtension tag. This is not perfect way, but prescribed by the standard.

Thus, digiKam breaks the (ISO) standard at least in file naming scheme.

Changing XMP naming scheme in FRV is not as easy as it looks because of lot of (complex) code that detects (possible) XMP naming conflicts and deals with it. It is very unlikely we'll do this change (to support standard break), sorry.