RE: Fallback mechanism for the datatype

I interpret Makoto's paragraph differently. To me it says:

"If a conformant RELAX NG processor encounters a datatype library that it
does not recognize, it MAY report a warning. It may, for example, continue
or abort normal processing."

So if I am writing a fridge-firmware implementation, I don't think I am
forced to produce a warning or error, and I am happy.

-Mike