Re: XML cfg entries for custom levels

It is not a facility that I have used, but it is tested in the unit 
tests by tests/src/customlogger/xloggertestcase.cpp.
I compared your config file with the tests/input/xml/customLogger1.xml, 
the config file for that test and didn't see any significant 
differences.

I believe the more likely problem is a registration failure of the 
level class.  You might try comparing your level class with 
tests/src/xml/XLevel.cpp which implements two additional levels 
"lethal" and "trace" used in the unit tests and see if you might have 
missed some registration macro.