[EAI] Proposed resolution of List-* and downgrade- Issues

[Randall Gellens <randy at qualcomm.com>]

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Proposed resolution of "List-*" headers:

EAI to define new versions of List-* headers which can have unencoded 
UTF8 values. This is just a trivial revision of the current forms. 
Like the current forms, each header can have multiple IRI, URL, URL, 
etc.  Note that this is orthogonal to new "mailto" -- when mailto-bis 
is ready, it just drops in as any other scheme such as HTTP.

This is accomplished by creating a new WG document for 2369-bis to 
extend List-* headers to "permit UTF8 whenever UTF8 is otherwise 
permitted in header fields".  There isn't a need to do more than 
adding this one sentence to the existing 2369, I think.  So hopefully 
it will be very simple to produce.  We need to be very clear that, as 
2369-bis is being done by EAI, its scope is strictly limited to 
permitting UTF8 and not to any other changes that anyone might desire 
in 2369.

A preference is for List-ID to be considered special and remain ASCII 
(same as Message-ID). There is an open question on internationalized 
domain names: since these are used in Sieve scripts, users need to be 
able to type them in.

Note that allowing UTF8 in List-* headers is equivalent to allowing 
UTF8 in address headers.  Presumably, only EAI-aware clients will see 
either.

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New text in -downgrade:

List-* headers which contain native UTF8 should be copied into
Downgrade-List-* and the UTF8 IRI should be dropped (alternate:
encoded per IRI).

Add informative reference to new 2369-bis draft along the lines of 
"Since [2369-bis] permits UTF8 in List-* headers, which are vital to 
user's experience of mailing lists, this document needs to specify 
how such headers are to be downgraded and remain valid."

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New text in -mailinglist:

Where available, mailing lists SHOULD include an ASCII form of List-* 
headers as well as a UTF8 form. Because these headers are vital to 
good operations and use of mailing lists, special rules are defined 
in [downgrade] so that such headers are not stripped during 
downgrade, but are preserved with working values whenever possible.

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New text in -framework-bis:

New versions of List-* headers are also defined, which permit native UTF8.

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-utf8headers:

My suggestion is to create an I-D for utf8headers-bis which adds
List-* headers, and keep it around as an I-D for when we go to
standards track.

--
Randall Gellens
Opinions are personal;    facts are suspect;    I speak for myself only
-------------- Randomly-selected tag: ---------------
Nobody can be exactly like me. Even I have trouble doing it.
                                       --Tallulah Bankhead
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