Re: LSID lookup details: help?

Hello Henry,
You are quite correct the OMG has not yet registered the LSID NID with 
urn.arpa yet.  I believe that as required by the LSID spec, the reference 
software implementations that are in use at this time default to the (b) 
NAPTR rule  which substitutes in the authority portion of an LSID and 
queries that domain name for a SRV record indicating the whereabouts of 
the resolution server for that authority.  As far as I know nobody has yet 
requested splitting the DNS domain from their LSID authority, which is no 
doubt why there has been no urgency to wrap this up, although things being 
as things are, I guess it is only a matter of time.

I happened to communicated with  Dr Richard Soley (OMG Chair) a few weeks 
back on this very topic. In the BioRDF group I was requested to see if I 
could get a prototype working of the LSID -> HTTP Arc style resolver that 
you suggested and which I think will generally be perceived as a good idea 
although with the LS LSID crowd one never really knows!  At least I think 
it is a good idea and am happy to prototype it since the software is 98% 
written already. Anyway,  Dr Soley is strongly supportive of this new 
effort and has arranged for me to work with the OMG administrators to 
register an appropriate domain for the prototype etc. It seems he is also 
interested to see an update to the LSID spec that would reflect this 
addition (I am assuming if the prototype works well and there is interest 
) in due course.  I noted the LSID NID registration status and asked about 
the OMG's intentions and he reiterated his previous position that the OMG 
would register it and asked me to work with various people there to get it 
done. So I am on the hook.

Kindest regards, Sean

--
Sean Martin
IBM Corp





ht@inf.ed.ac.uk (Henry S. Thompson) 
09/26/2006 12:09 PM

To
Dan Connolly <connolly@w3.org>
cc
Sean Martin/Cambridge/IBM@IBMUS, public-semweb-lifesci@w3.org, Alan 
Ruttenberg <alanruttenberg@gmail.com>, Noah Mendelsohn/Cambridge/IBM@Lotus
Subject
Re: LSID lookup details: help?






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On 31 July 2006, Dan Connolly wrote:

> In today's call, I learned a bit about how LSID lookup
> works:
>
>  (1) try to find an SRV record using the domain in the LSID
>  (2) fall back to a DDDS lookup and NAPTR and such
>
> Option (2) depends on some NAPTR stuff in the "arpa" parts
> of DNS space that OMG is expected to install but hasn't
> gotten around to, largely for lack of urgent need, I gather.

Indeed I've spent a fair amount of time exploring the foundations of
DDDS for use in URN resolution, as proposed for LSID, which are
supposed to be located in NAPTR records for subdomains of urn.arpa.
As far as I can tell after extensive search, there are _no_ such
subdomains behaving as advertised. Indeed the _only_ active use of
DDDS/NAPTR I can find is e164.arpa, the root authority for the ENUM
story about DNS-resolvable telephone numbers.

There is only one URN namespace registered as mandated by DDDS, namely
PIN [1], but following the DDDS algorithm for it runs into the sand:

  > dig pin.urn.arpa naptr
   . . .

   ;; ANSWER SECTION:
pin.urn.arpa.   21600   IN   NAPTR   100 100 "" "" "" 
pin.verisignlabs.com.


  > dig pin.verisignlabs.com naptr
   . . .
   status: SERVFAIL

  > dig @ns1.verisignlabs.com pin.verisignlabs.com naptr
   . . .
   status: NOERROR, . . . ANSWER: 0

So Verisign appears to have abandoned PINs -- if anyone knows of _any_
working subdomains of urn.arpa, please let us know!

This is all about (2) in your original list above.  Could someone
point to the basis in the LSID spec [2] for your (1) -- I can't spot
it. . .

Thanks,

ht

[1] http://www.iana.org/list-archives/register-urn/msg00008.html
[2] http://www.omg.org/cgi-bin/apps/doc?formal/04-12-01.pdf
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of 
Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged 
spam]
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