RE: urn:oid:

Phillip Maness <Phillip.Maness@dts.com> Mon, 17 March 2014 18:16 UTC

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From: Phillip Maness <Phillip.Maness@dts.com>
To: "Dale R. Worley" <worley@ariadne.com>, "Martin J. DC<rst" <duerst@it.aoyama.ac.jp>
Subject: RE: urn:oid:
Thread-Topic: urn:oid:
Thread-Index: AQHPPy1/azGiyYDURGqVULMjcCC13prlk3IBgAABiSA=
Date: Mon, 17 Mar 2014 18:16:42 +0000
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References: <520A56052CF01E42B1C128F990FBE681A4715F92@LAX-EXMB02.dts.local> <532269FE.6010807@it.aoyama.ac.jp> <201403171740.s2HHePIX7298300@shell01.TheWorld.com>
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Hi Dale,

Just for clarification, when you say "permanent" are you referring to a persistent instance of "identifier" or a persistent meaning of "identifier".

In all applications where I would use an identifier, the meaning would never change (it couldn't, applications would cease to function correctly). They usually do have a value parameter that changes. The documents they appear in, (often an XML manifest), typically live for anywhere from a few minutes to a few days.

Thanks,
Phil

-----Original Message-----
From: Dale R. Worley [mailto:worley@ariadne.com]
Sent: Monday, March 17, 2014 5:40 PM
To: Martin J. DC<rst
Cc: Phillip Maness; urn-nid@apps.ietf.org; Mark R. Johnson
Subject: Re: urn:oid:

> From: "Martin J. DC<rst" <duerst@it.aoyama.ac.jp>

> Domain names are being changed and reused all the time. And
> people/organizations who reuse them usually don't know what URNs their
> predecessors have minted, nor would they care.

A workable solution is to attach to the domain name the date on which the organization had possession of the domain name.  That solution is used in the "tag" scheme (RFC 4151):

   Examples of tag URIs are:

     tag:timothy@hpl.hp.com,2001:web/externalHome
     tag:sandro@w3.org,2004-05:Sandro
     tag:my-ids.com,2001-09-15:TimKindberg:presentations:UBath2004-05-19
     tag:blogger.com,1999:blog-555
     tag:yaml.org,2002:int

and in draft-ietf-salud-alert-info-urns "alert" URN extension elements:

    urn:alert:...:...@army.mil(1990):...
    urn:alert:...:...@army.mil(2013-03):...
    urn:alert:...:...@army.mil(2013-03-29):...

But in general, domain names shouldn't be incorporated into permanent identifiers.

Dale

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