Re: Inputting mixed SC/TC (Re: [idn] A question...)

["D. J. Bernstein" <djb@cr.yp.to>]

John C Klensin writes:
> many careful explanations of why specialized TC<->SC handling is not
> analogous to case-mapping in alphabetic character sets.

Here is James Seng's answer to the TC/SC complaints:

   The user behavior education about domain names should be that domain
   names are identifier, not names. They should enter into the computer
   exactly as they seen it or reference it.

This answer destroys the stated reasons for case-mapping. (Case-mapping
was, in turn, the primary excuse for sticking IDNA into applications.)

This is not just an analogy. It is a literal application of Seng's
principle. Do you think that the principle is incorrect? If so, what
exactly is wrong with it?

I agree with your comment that these issues go beyond Chinese. We have
vowels in Hebrew, accents on capital letters in French, o-umlaut and oe
in German, etc. But I do not agree with your claim that this has all
been settled in previous IDN discussions. Nobody has given a coherent
explanation of _why_ IDNA needs to do certain mappings and not others.

---D. J. Bernstein, Associate Professor, Department of Mathematics,
Statistics, and Computer Science, University of Illinois at Chicago