[NNTP] Extension snapshots 3

[Clive D.W. Feather]

Ken Murchison said:
>> "If a server supports the MODE STREAM, CHECK, and TAKETHIS commands, the
>> MODE STREAM command MUST return a 203 response (or 501 if an argument is
>> given), [but / and] MUST NOT have any other effect."
> 
> How about splitting the sentence, e.g.:
> 
> "If a server supports the CHECK and TAKETHIS commands it MUST return a 
> 203 response to the MODE STREAM command (or 501 if an argument is 
> given).  The MODE STREAM command MUST NOT affect any changes on the server".

I have difficulty with "affect" in that context.

The corresponding wording for MODE READER is:

    If the server is not mode-switching, then:
    * If it advertises the READER capability, it MUST return a 200 or 201
      response with the same meaning as for the initial greeting; in this
      case the command MUST NOT affect the server state in any way.

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