Re: [draft-melnikov-sieve-external-lists] 2.2 Allow Extensions To Use List

[Barry Leiba <barryleiba.mailing.lists@xxxxxxxxx>]

> Require implementations to raise a compile time error when list
> is used with an unsupported test.

That's already what happens when there are such errors in scripts.
Why should we say it explicitly here, and not everywhere else?

>    Implementations MAY support other tests but MUST raise a compile
>    time error when a script contains any standard test where support has
>    not been explicitly specified.

Not explicitly specified by whom?  How?

How does this make scripts portable?  This seems to encourage private
extensions, which has really become a thorn in the web.

Barry