Re: [lemonade] WGLC compress-02: multiple COMPRESS algorithms

[Tony Hansen <tony at att.com>]

One addition, below.

	Tony

Tony Hansen wrote:
> I think the following covers all that is needed to handle the
> possibility of future algorithms being needed, while making it suitably
> difficult to actually add one.
> 
> *IF* in the future, another algorithm were added, and a server supported
> both algorithms, how would the additional algorithms be announced? I
> think we should choose a method comparable to that used in other
> mechanisms that allow multiple values, that is, a comma separated list.
> 
> There is no ABNF specified for the COMPRESS capability, so we need to
> add this to the ABNF section.
> 
> 	capability =/ "COMPRESS=" algorithm-list
> 	algorithm-list = algorithm *["," algorithm]
> 
> Just in case, some future algorithms may require arguments to be passed.
> I suggest adding the following to the compress ABNF:
> 
>         compress    = "COMPRESS" SP algorithm *[SP argument]
> 	argument    = 1*TEXT
> 
> For the IANA considerations section, I think the following would be
> appropriate:
> 
> 7. IANA Considerations
> 
>     The IANA is requested to add COMPRESS=DEFLATE to the list of IMAP
>     extensions.
> 
>     The IANA is requested to maintain one new registry: IMAP Compression
>     Algorithms. The registry's purpose is to register compression
>     algorithms that may be used with this extension.  New IMAP
>     algorithms MUST be defined in a standards track or IESG approved
>     experimental RFC.  New IMAP compression algorithms MUST include the
>     following information as part of their definition:
> 
> 	algorithm identifier
> 	optional arguments
> 	standard commands affected
> 	specification reference
> 	discussion

    One IMAP compression algorithm is defined in this document, with the
    following registration definition:

      algorithm identifier: DEFLATE
      optional arguments: none
      standard commands affected: none
      specification reference: RFC 1951 and XXXX
      discussion: see RFC XXXX

    [RFC-EDITOR NOTE: change XXXX to this RFC number]


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