Eric,
On 10/9/2018 7:23 PM, Eric Rescorla wrote:
However some services have defined an operational convention, which
applies to DNS leaf nodes that are under a DNS branch having one or
more reserved node names, each beginning with an _underscore. The
underscored naming construct defines a semantic scope for DNS record
types that are associated with the parent domain, above the
underscored branch. This specification explores the nature of this
This text is a bit hard to parse for the layman. Here's my attempted
rewrite, which captures what I think this means.
Conventionally, this construct associates data with the parent domain,
with the underscored label instead denoting the type of the data.
I'm not sure if that helps, but perhaps something along these lines?
Yeah, this has been an oddly challenging bit of text to formulate. Perhaps:
However some services use an operational convention for defining
specific interpretations of an RRset, by locating the records in a DNS
branch, under the parent domain to which the RRset actually applies.
The top of this subordinate branch is defined by a naming convention
that uses a reserved node name, which begins with an _underscore.
S 1.1.
1.1. Underscore Scoping
As an alternative to defining a new RR type, some DNS service
enhancements call for using an existing resource record type, but
specify a restricted scope for its occurrence. Scope is meant as a
I think I get why you are saying "scope" here, but it's kind of not
that good fit with the programming concepts of scope as I am familiar
with.
So I took your concern as an excuse to review the CS definition and
find that I still think its application here is appropriate... And it
has not seemed to cause confusion for others.
S 2.
+----------------------------+
Examples of Underscored Names
Only global underscored names are registered in the IANA Underscore
Global table.
so just for clarify, in the examples above, only _service[1-4] and
_authority would need to be registered?
Yes. (And I've added a sentence noting that point, for clarity. Thanks.)
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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