Prohibiting mapping of PVALID characters

[Eric Brunner-Williams]

Kenneth Whistler wrote:
>> At 2:26 PM -0800 12/9/09, Kenneth Whistler wrote:
>>> The other problem with this is that it might cause implementers'
>>> heads to explode when they realize that normalization to NFC
>>> is required (MUST)
>> Uh, oh. Where did you get that idea?
> 
> Protocol, 5.2:
> 
> 5.2. Conversion to Unicode
...
> 
> The protocol doesn't state that the Label String Input
> has to start out as NFC -- in fact the allowance for
> character set conversion from other local character
> sets into Unicode would actually preclude that.


Whatever it is you are describing it isn't (yet) a label.

It is a sequence of things, characters perhaps, and possibly a string, 
but a label is what such a thing might become, not what it is ab initio.