On Apr 30, 2015, at 9:02 AM, Andrew Sullivan <a...@anvilwalrusden.com> wrote:
>
> On Thu, Apr 30, 2015 at 11:14:24AM -0400, Lyman Chapin wrote:
>>
>> "Label - The identifier of an individual node in the sequence of nodes that
>> comprise a fully-qualified domain name."
>>
>
> I am not sure this is quite right, or if it is it's circular with the
> other definitions in RFC 1034.
>
> 1034 says this:
>
> Each node has a label, which is zero to 63 octets in length.
> Brother nodes may not have the same label, although the same label
> can be used for nodes which are not brothers. One label is
> reserved, and that is the null (i.e., zero length) label used for
> the root.
>
> The domain name of a node is the list of the labels on the path
> from the node to the root of the tree. By convention, the labels
> that compose a domain name are printed or read left to right, from
> the most specific (lowest, farthest from the root) to the least
> specific (highest, closest to the root).
>
> The problem therefore that I see is that the identifier of the node is
> the domain name (which we have clarified as the "fully-qualified
> domain name"). This is why the text I'd previously sent to Suzanne
> used "portion". For while I agree that it's not great, it does anchor
> this in the discussion already in 1034.
>
> What about
>
> Label - the identifier of an individual node in the DNS namespace
> taken apart from its location in a fully-qualified domain name.
>
> I think this is consistent with the "Each node has a label" language.
> But it's pretty hard to understand, and still faintly circular.
These are all circular, and I think we have to live with that. This last one is
fine with me too.
We now have:
The portion of a domain name at each node in the tree making up a
fully-qualified domain name.
The identifier of an individual node in the sequence of nodes that
comprise a fully-qualified domain name.
The identifier of an individual node in the DNS namespace taken apart
from its location in a fully-qualified domain name.
--Paul Hoffman
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