M-label definition

Lisa Dusseault lisa.dusseault at gmail.com
Wed Apr 8 01:59:03 CEST 2009

I'm not certain a new term needs to be introduced.  If we're talking
about a string that is invalid as a label, giving it that term seems
to legitimize it.  If we're talking about a string that may or may not
be valid, that's just "a string"


On Fri, Apr 3, 2009 at 8:17 PM, John C Klensin <klensin at jck.com> wrote:
> Hi.
> I'm trying to put notes together for updates to the documents,
> even though I don't intend to open them up until Vint makes some
> statements about consensus.
> I believe that we have agreement that, if the documents are to
> discuss mapping at all, an additional term that has been
> described as an "M-label" would be useful.   However, in sorting
> through my notes, I believe I've seen two different definitions,
> i.e.,
>        "An M-label is a string that becomes a U-label after
>        mapping but it not, itself, a U-label.   In more recent
>        terminology, if a U-label is a canonical form, the
>        M-label is a non-canonical form of the same thing.  The
>        categories of M-label and U-label are disjoint."
>        (Patrik and others)
>        "An M-label is a string that can be mapped into a
>        [valid] U-label.  It may be a U-label, since those
>        trivially map into themselves.  The category of U-label
>        is a proper subset of the category of M-label." (Mark
>        and others).
> Which one of these fits the text better depends on how the text
> is written -- it could be done either way as far as Definitions
> and Protocol are concerned, although I think the first
> definition might work better for Tables.
> I think it would be a really bad (and very confusing) to end up
> with M-label(1) and M-label(2) even if different terms are used,
> so the WG will need to decide.
>    john
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