Comments on idnabis-rationale-01

[Eric Brunner-Williams]

Data label taxonomy:

binary (rfc2673) [any bit-boundary]
    text (none) [zero or more octets]
       ascii (none) [zero or more octets, encoding]
          ldh (rfc1035) [obvious subset]
            a-label (idnabis) [xn-- prefix, plus stuff]
            z-labels (none) [anything with an "--", not preceeded by 
"xn", not ^anchored, to suggest an answer to Frank's question]

Eric

Frank Ellermann wrote:
> Tina Dam wrote:
>
>   
>> I would be ok with a different term as well, but I don't
>> have any good ideas.
>>     
>
> The funny thing is that we all like LDH-label as intuitively
> clear, and then don't agree on the same definition.  Here's
> some simplified ASCII art:
>
> +--------------------------------+
> | DNS labels (octets)            |
> |                                |
> | +------------------------------+
> | | LDH labels (LDH)             |         
> | |                              |
> | | +----------------------------+     +----------+
> | | | A-labels (IDNAbis valid)   | <=> | U-labels |        
> | | +----------------------------+     +----------+
> | |                              | 
> | +------------------------------+
> |                                | 
> +--------------------------------+
>
> What I see is "A-labels are a proper subset of LDH-labels,
> as specified in IDNAbis.  LDH-labels are a proper subset
> of DNS labels, as specified in RFC 1123" (or similar).
>
> What John sees is "A-labels are one thing, and LDH-labels
> are the DNS labels consisting of LDH which are no A-labels,
> as specified in IDNAbis".
>
> IOW John has no name for the union of A-label and LDH-label
> in his terminology (the middle box in the ASCII art).
>
> I've no term for those LDH-labels which are no A-labels in
> my terminology (the middle box excluding the innermost box).
>
>  Frank
>
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