RE: URN registration - Email found in subject

["DTG Registration" <[e-mail]>]

Hello,

An example of a completed URN is:

urn:dtg:metadata:cs

Do the IETF have a preferred mechanism to guarantee uniqueness?  Forbidding reassignment of the assigned number would not be problematic for our use of the urn.

Which community are you referring to?

Many thanks,

Will Godfrey




-----Original Message-----
From: Ted Hardie [mailto:[e-mail]] 
Sent: 02 March 2011 17:13
To: DTG Registration
Cc: [e-mail]
Subject: Re: URN registration - Email found in subject

Howdy,

The text of this NID registration seems to rely on fully qualified
domain names never being reasssigned ("that the FQDN is never
reassigned") to guarantee uniqueness.  This is, of course, not a
property guaranteed by the DNS.

The structure:

 URN:<assigned number>:<FQDN>:<assigned string>

hints, though, that the actual guarantee of uniqueness might be based
on a tuple of the first assigned string and the fqdn.  This might
work, though it would be simpler to forbid reassignment of the
assigned number.

Can you clarify which strategy is intended here?  An example of a
completed URN would also be helpful.

Lastly, the registration template should contain a "Community
Considerations" section, which is missing here.

regards,

Ted Hardie

On Wed, Mar 2, 2011 at 8:02 AM, DTG Registration
<[e-mail]> wrote:
> Namespace ID: To be assigned
>
> Registration Information:
> Registration version number: 1
> Registration date: 2011-02-24
>
> Declared registrant of the namespace:
> Registering organization
>        Name: Digital Television Group
>        Address: 1 Nine Elms Lane, London, SW8 5NQ UK
> Designated contact person
>        Name: Ali Teffahi
>        Coordinates: [e-mail]
>
> Declaration of syntactic structure:
>        The identifier structure is as follows:
>        URN:<assigned number>:<FQDN>:<assigned string>
>        URN:dtg
>
> Relevant ancillary documentation:
>        Definition of domain names, found in:
>        P. Mockapetris, "DOMAIN NAMES - IMPLEMENTATION AND
> SPECIFICATION",
>        RFC 1035, November 1987.
>
> Identifier uniqueness considerations:
>        Uniqueness is guaranteed as long as the assigned string is never
> reassigned for a given FQDN, and that the FQDN is never reassigned.
>
> Identifier persistence considerations:
>        Persistence of identifiers is dependent upon suitable delegation
> of resolution at the level of "FQDN"s, and persistence of FQDN
> assignment.
>
> Process of identifier assignment:
>        Assignment of these URNs is delegated to individual domain name
> holders (for FQDNs).  The holder of the FQDN registration is required to
> maintain an     entry (or delegate it) in the DDDS. Within each of these
> delegated name partitions, the string may be assigned per local
> requirements.
>
> Process for identifier resolution:
>        Domain name holders are responsible for operating or delegating
> resolution servers for the FQDN in which they have assigned URNs.
>
> Rules for Lexical Equivalence:
>        FQDNs are case-insensitive.  Thus, the portion of the URN
>        URN:dtg
>        is case-insensitive for matches.  The remainder of the
> identifier must be considered case-insensitive also.
>
> Conformance with URN Syntax:
>        No special considerations.
>
> Validation mechanism:
>        None specified.
>
> Scope:
>        Global.
>
>
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>
>
>
>
>


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