[NNTP] Backward compatibility section?

[Peter Robinson]

Clive D.W. Feather <clive at demon.net> wrote:

>  6.1.2  LISTGROUP

[...]

> +   Note that the range argument (but not, unlike GROUP, the ability to
> +   omit the group name) is a new feature in this specification and
> +   servers that do not support CAPABILITIES (and therefore do not
> +   conform to this specification) are unlikely to support it.

This is really helpful.

I think we should consider adding a separate section listing all places
like this where a client might try to use a new feature of an old
command on an old server.  Currently it's not obvious which features are
new.

That section would point out that lack of support for CAPABILITIES is a
good indicator of an old server.

Features like this (there may well be more):
 - LISTGROUP with range
 - LISTGROUP's new response
 - GROUP without group
 - ! and , in wildmats

Opinions?

Peter