Re: [art] draft-ietf-dnsop-attrleaf

["John Levine" <[e-mail]>]

In article <[e-mail]> you write:
>We in DNSOP have a draft that is formalizing the use of _underscore labels
>in DNS, and the creation of a "DNS Global Underscore Scoped Entry
>Registry".   We want the application folks to give us some comments, as we
>feel we are fairly  close to Working Group Last Call.

When I last talked to Dave about this, we had a problem with URI records.

They can be named _service._tranport.whatever, just like SRV, but they
can also be named with enumservice (RFC 3761 and 6117) names,
_subtype._type.whatever.  There are about 24 type names in the
enumservice registry, none of which currently collide the transport
names.  To prevent collisions in the future, we need somehow to
cross-reference the port and service name registries so any attempt
to register a name in one checks for an entry in the other.

I asked IANA and as I recall Michelle said they can do that, but Dave
was worried about the long term viability of a special case in the
registration process.

We also noted that the number of URI records in the wild is still
small, so another possibility would be to change RFC 7553 so
enumservice URIs are _subtype._type._enum.whatever, and then reserve
"enum" as a transport name.

R's,
John