Bundling vs Mapping

[Mark Davis]

Because of the mapping required in IDNA2003, it is possible to use href="
http://Bücher.de <http://b%c3%bccher.de/>", as well as
"HTTP://BÜCHER.DE<http://b%c3%9ccher.de/>",
or "HTTP://BU¨CHER.DE <http://bu%cc%88%cc%88cher.de/>" (where the ¨
represents a U+0308 <http://unicode.org/cldr/utility/character.jsp?a=0308> (
̈ ) COMBINING DIAERESIS), or many other variations.

According to IDNA2008, uppercase Unicode is simply illegal. href="
http://Bücher.de <http://b%c3%bccher.de/>" would simply fail. So bundling of
case variants is not necessary. However, many of us are quite concerned
about the interoperability and security problems that will ensue. See the
draft mapping being worked on by the Unicode consortium, so as to preserve
interoperability as much as possible: http://www.unicode.org/reports/tr46/

Mark


On Tue, Feb 24, 2009 at 13:36, Shawn Steele (???) <
Shawn.Steele at microsoft.com> wrote:

> There's lots of discussion of bundling of related names instead of mapping.
>  I'm curious how that behaves when round tripping?
>
> Presumably a registrant would like a specific name.  Related names are also
> interesting, hence bundling, however there is probably one preferred
> specific name.  How does the client device get from some input variant to
> the preferred name in the UI (eg: browser address bar)?
>
> Bundling also has some limitations.  Bundling (or not) Eszett with ss may
> be interesting and helpful, however that won't scale to casing.  Currently
> DNS is expected to be case insensitive, and it isn't really practical to
> register all the variants of some IDN form of mYdOmAiN.com.  So there's
> still a question of mapping, clients are still going to have to do at least
> some mapping.
>
> - Shawn
>
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