If you want specify log-parameters for loggers of a whole namespace normally you use a scheme like
<logger name="GrandNS.ParentNS.ChildNS.*" ..
this is the same like
<logger name="GrandNS.ParentNS.ChildNS" ..
There is no ambiguous name possible, because it is not allowed to define a class with the name of a namespace at the same namespace-level.