gYearMonth, gYear... etc.

Remove those nasty g letters from gYearMonth etc. gregorian
calendar built-in simple date types. Or remove those datatypes
entirely. It is nice that you have simplified built-in datatype
hierarchy but at least I don't think that those gregorian calendar
datatypes are relevant to be included in XML Schema specification.

They are also bit confusing because the lexical reprensentation of
them is a little bit strange. And we already have dateTime, date
and time primitive types. I can't see any reason for those datatypes
to be included in final recommendation. If someone needs them they
can always derive new simple types to represent those gregorian
datatypes.

Kind Regards
Aapo Laakkonen