Re: [idn] Report from the ACE design team
"Jim Fleming" <JimFleming@prodigy.net> Mon, 25 June 2001 18:04 UTC
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From: Jim Fleming <JimFleming@prodigy.net>
To: idn@ops.ietf.org, Makoto Ishisone <ishisone@sra.co.jp>
References: <p0510032cb74fd055e43c@[165.227.249.18]> <20010626013216L.ishisone@sra.co.jp>
Subject: Re: [idn] Report from the ACE design team
Date: Mon, 25 Jun 2001 12:36:23 -0500
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http://www.ntia.doc.gov/ntiahome/domainname/130dftmail/unir.txt ??? DUDE ??? ACE 4:86 RACE Jim Fleming http://www.unir.com Mars 128n 128e http://www.unir.com/images/architech.gif http://www.unir.com/images/address.gif http://www.unir.com/images/headers.gif http://msdn.microsoft.com/downloads/sdks/platform/tpipv6/start.asp http://www.ietf.org/mail-archive/ietf/Current/msg12213.html http://www.ietf.org/mail-archive/ietf/Current/msg12223.html ----- Original Message ----- From: "Makoto Ishisone" <ishisone@sra.co.jp> To: <idn@ops.ietf.org> Sent: Monday, June 25, 2001 11:32 AM Subject: Re: [idn] Report from the ACE design team > In message <p0510032cb74fd055e43c@[165.227.249.18]>, > Paul Hoffman / IMC <phoffman@imc.org> wrote: > > Greetings again. This report from the ACE design team was turned in > > yesterday and will appear in the official Internet Drafts directory > > on Monday. > > ... > > As draft-ietf-idn-ace-report-00 says, the current recommendation of the > ACE design team is DUDE. However, as stated in the draft, the design > team has not yet come to a complete agreement on DUDE, and I'm one of > the members who is not convinced of the recommendation. > > My opinion is certainly reflected in the draft, but I'd like to > explain here the reason why I think DUDE may not be the best choice. > > What I'm worrying about DUDE is its relative inefficiency for CJK > scripts. > > DUDE's compression algorithm (variable-length differential encoding) > seems to work very efficiently when the code points of the characters > in a name are clustered in a small range. It is the case for most of > Western scripts. > > However, for languages with large number of characters (such as CJK), > the algorithm tends to work poorly. In the worst case DUDE encodes > one Unicode character (in the Basic Multilingual Plane) as 4-octet > sequence. This happens frequently for CJK Han or Hangul names because > the characters in these scripts are scattered in the Unicode code > point space. > > This means that in the worst case a name of 15 characters might not > fit into a 63-octet label (assuming 4-octet prefix such as 'dq--'). > We expect that typically up to 15 character name can be encodable by > DUDE. > > The following points are my main concern: > > 1) Is 14-15 character is enough? > At least for Japanese domain names, name of a company or an > organization is sometimes quite long. My question is whether the > maximum of 14-15 character name for CJK is enough or not. If it > is, DUDE would be fine. But if it isn't, other ACE which is > more efficient (in dealing long names) but less simple might be > better. > > 2) Potential migration problem > Many NICs has already begun registering internationalized domain > names using RACE as the ACE. In RACE, any names up to > 17-characters can be fit in 63-octet label. So it is possible that > some of the registered names suddenly become invalid when migration > from RACE to DUDE take place. Of course it is a risk that they > have to take, but if choosing other ACE can prevent it, or lower > the possibility, it might be a better choice. > > -- ishisone@sra.co.jp >
- Re: [idn] Report from the ACE design team James Seng/Personal
- Re: [idn] Report from the ACE design team Kenneth Whistler
- Re: [idn] Report from the ACE design team liana.ydisg
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Makoto Ishisone
- Re: [idn] Report from the ACE design team Maurizio Codogno
- Re: [idn] Report from the ACE design team Tony Hansen
- [idn] Report from the ACE design team Paul Hoffman / IMC
- Re: [idn] complexity/simplicity: NAMEPREP code vs… Mark Davis
- Re: [idn] Report from the ACE design team Eric Brunner-Williams in Portland Maine
- Re: [idn] Report from the ACE design team Dan
- Re: [idn] Report from the ACE design team Eric Brunner-Williams in Portland Maine
- Re: [idn] Report from the ACE design team Yoshiro YONEYA
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Dave Crocker
- RE: [idn] Report from the ACE design team Hollenbeck, Scott
- Re: [idn] Report from the ACE design team Dan
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Makoto Ishisone
- Re: [idn] Report from the ACE design team Kenneth Whistler
- Re: [idn] Report from the ACE design team Marc Blanchet
- Re: [idn] Report from the ACE design team Kenneth Whistler
- RE: [idn] Report from the ACE design team Brian W. Spolarich
- RE: [idn] Report from the ACE design team Hollenbeck, Scott
- Re: [idn] Report from the ACE design team Jim Fleming
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Makoto Ishisone
- Re: [idn] Report from the ACE design team Paul Hoffman / IMC
- Re: [idn] Report from the ACE design team Eric Brunner-Williams in Portland Maine
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] complexity/simplicity: NAMEPREP code vs… Makoto Ishisone
- RE: [idn] Report from the ACE design team Larson, Matt
- Re: [idn] Report from the ACE design team Adam M. Costello
- Re: [idn] Report from the ACE design team Jim Fleming
- Re: [idn] Report from the ACE design team liana.ydisg
- Re: [idn] Report from the ACE design team Marc Blanchet
- Re: [idn] Report from the ACE design team Mark Davis
- Re: [idn] Report from the ACE design team James Seng/Personal
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Maurizio Codogno
- [idn] complexity/simplicity: NAMEPREP code vs ACE… Soobok Lee
- Re: [idn] complexity/simplicity: NAMEPREP code vs… Soobok Lee
- Re: [idn] Report from the ACE design team Soobok Lee
- Re: [idn] Report from the ACE design team Paul Hoffman / IMC
- Re: [idn] Report from the ACE design team liana.ydisg
- Re: [idn] complexity/simplicity: NAMEPREP code vs… Makoto Ishisone
- RE: [idn] Report from the ACE design team Marc Blanchet
- Re: [idn] Report from the ACE design team Yoshiro YONEYA
- Re: [idn] Report from the ACE design team Makoto Ishisone
- Re: [idn] Report from the ACE design team Kenneth Whistler
- Re: [idn] Report from the ACE design team liana.ydisg
- Re: [idn] complexity/simplicity: NAMEPREP code vs… Mark Davis