Re: SIMPLE chat: Internationalization and normalization of nicknames

OK, you guys have obviously gone down this path before.
I'm happy to have you suggest what is reasonable and what is not.

	Thanks,
	Paul

On 3/2/12 4:23 PM, Peter Saint-Andre wrote:
> On 3/2/12 12:08 PM, Ben Campbell wrote:
>>
>> On Mar 2, 2012, at 10:39 AM, Paul Kyzivat wrote:
>>
>>> On 3/1/12 5:54 PM, Ben Campbell wrote:
>>>
>>>>> OK. It seems that you might also be making some authorization
>>>>> decisions based on the nickname, e.g., if you've reserved a
>>>>> nickname then I can't get that nickname (can I join the
>>>>> chatroom but just not with that nickname?).
>>>>>
>>>>
>>>> Yes, that is true. We do need an equality operator in some sense.
>>>> (And yes, assuming no other policy issue was blocking you, you
>>>> could still use a different nickname)
>>>
>>> And this presumably needs some notion of canonicalization, so that
>>> you can't get two nicknames that compare as different but *look*
>>> the same.
>>
>> That's going to be a very hard problem to solve. I suspect we will
>> end up with text that points out that this can happen, but leave it
>> up to implementors to figure out what to do about it.
>
> The problem of so-called confusable characters is impossible to solve.
> See for instance:
>
> http://tools.ietf.org/html/draft-ietf-precis-framework-01#section-10.3
>
> The Unicode Consortium has gone a bit farther:
>
> http://unicode.org/reports/tr39/#Confusable_Detection
>
> You can nibble around the edges here, but foolproof solutions cannot be
> had (in large measure because humans are so easily fooled).
>
>> (Peter: Do you have your Cherokee example handy?)
>
> http://stpeter.im/journal/1420.html
>
> That is: ᏚᎢᎵᏋᎢᏋᏒ != STPETER (and Cherokee Letter Quv = Ꮛ is not defined
> by the Unicode standard as confusable with, mapped to, or otherwise
> equivalent to Latin Uppercase E despite their surface similarity).
>
> Peter
>

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