Comments on the Unicode Codepoints and IDNA Internet-Draft

Mark Davis mark.davis at
Tue Jul 29 16:02:23 CEST 2008

> 'd need straight forward tool showing me
for most of the properties, there is tool at

Put in the character or code point and you'll get the properties. You can
also pass in the parameter in the query part of the URL, eg for the
properties of U+2019, use:

You can also navigate from there to seeing the lists of all characters with
a given property value, and a few other windows.


On Tue, Jul 29, 2008 at 6:54 AM, Frank Ellermann <
hmdmhdfmhdjmzdtjmzdtzktdkztdjz at> wrote:

> Stéphane Bortzmeyer wrote:
> >> There is a reason why many code points such as "mathematical
> >> fraktur capital B" or "black-letter capital C" are disallowed.
> > Do you mind if I ask the reason?
> Of course I don't mind.  I'm also very interested in "rationale"
> and "alternatives" questions.  Several points in the IDNA design
> are *very* far from obvious.  It's certainly not about the goal
> "get some LDH output for non-ASCII Unicode input".
> In that specific case I'd need straight forward tool showing me
> all properties of any given code point in a human readable form,
> but I don't have that, and I'm too lazy to write it.
> I'd guess that those two code points are not really letters in
> an Unicode sense, and back in IDNA2003 folks decided to emulate
> the spirit of "ASCII LDH" also for U-labels.  I cannot say WHY.
> But taking this as given "no letter and no digit => disallowed"
> is clear.  For the reasons why an obvious letter is no letter
> in Unicode I better don't speculate.  I certainly don't need a
> code point for "black-letter capital C", but admittedly I'm no
> typesetter for mathematical books.
>  Frank
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