It seems that there still are problems with conf mappings containing whitespace around semicolon separator. The rules for using semicolon are supposedly self-evident and are not explained anywhere AFAICS.
My understanding is that semicolon is used in situtations when different confs have different mappings, like "A->default;B->master" or "A;B->master" when defaultconfmapping is set. I cannot find a specification, though, what should happen when defaultconfmapping is not set or when conf is "A;B": an exception or semicolon interpreted as comma? Gintas