[NNTP] LIST OVERFIEW.FMT capability

[Clive D.W. Feather]

Urs Janßen said:
> e.g. is the following (not very usefull) answer allowed
> 
> [C] CAPABILITIES
> [S] 101 Capability list:
> [S] VERSION 2
> [S] READER
> [S] LIST ACTIVE NEWSGROUPS OVERFIEW.FMT
> [S] .

Yes.

> or must OVER be implemented if LIST OVERFIEW.FMT is advertised.

No. It's the other way round: LIST OVERVIEW.FMT must be implemented if OVER
is advertised.

Consider an implementation that provides XOVER but not OVER. It can
advertise LIST OVERVIEW.FMT but can't advertise OVER.

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