[idn] Comments on IDN requirement

[wenhui zhang <zwh6810@yahoo.com>]

Hello

  I have several comments as follows, I hope you
can give the comments your consideration.
  To my understanding, the Requirement is a general 
IDN requirement,so
  first,it should have a good framework for many
possible solutions,however ,there are so many hints or
restrictions. I suggest we should find them and delete
them. 
  second, the Requirement should take future possible
resolutions into account,unfortunately,it has been
paid  so much attention to transitional and temporal
ways. Maybe we can think the requirement in general
,complete and long term way, and can include the
temporal thoughts, similar to IPV6 case.
   
  And, I have some comments on certain items in
requirement:

[1] It MUST make the minimum number of changes to
existing protocols on all layers of the
stack. It MUST continue to allow any system anywhere
to resolve any internationalized domain name.

ˇ°any systemˇ±should be any idn-compatible  system 


[4] The protocol MUST NOT require that the current DNS
cache servers be modified to support IDN.  If a cache
server can have additional functionality to support
IDN better, this additional functionality MUST NOT
cause problems for resolving correctly
functioning current domain names.

  If the requirement is subject to IDN final solution,
it should not have restrictions on cache server.
  If the requirement is only considering temporal
solution, the requirement should clearly say it is 
a temporal requirement.
  I suggest we change the [4] to:

The IDN compatible cache server MUST NOT cause
problems for resolving correctly
functioning current domain names.

[5] A caching server MUST NOT return data in response
to a query that would not have been returned if the
same query had been presented to an
authoritative server. This applies fully for the cases
when:

- The caching server does not know about IDN
- The caching server implements the whole
specification
- The caching server implements a valid subset of the
specification

what is specification?it need a clarification.

[33] An IDN-capable resolver or server SHALL NOT
generate more traffic than a non-IDN-capable resolver
or server would when resolving an ASCII-only domain
name.  The amount of traffic generated when resolving
an IDN SHALL be similar to that generated when
resolving an ASCII-only
name.

The traffic is a important factor ,but not only.We
should also consider the efficiency, simplicity and
other things of the IDN protocol. I suggest we delete
this item because we should find a solution which 
has the best ratio among little traffic, good
efficiency, simplicity and others.

[35] Within a single zone, the zone manager MUST be
able to define equivalence rules that suit the purpose
of the zone, such as, but not limited to, and not
necessarily, non-ASCII case folding, Unicode
normalizations (if Unicode is chosen),
Cyrillic/Greek/Latin folding, or raditional/simplified
Chinese equivalence. Such defined equivalences
MUST NOT remove equivalences that are assumed by (old
or local-rule-ignorant) caches.

I do not know why we have this item?
If the equivalence rules are be defined by zone
manager,the global ones will be inconsistent and
ambiguous.


Thanks for your consideration

wenhui








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