- From: Martin Hepp <martin.hepp@ebusiness-unibw.org>
- Date: Thu, 2 Aug 2012 10:51:11 +0200
- To: Tom Morris <tfmorris@gmail.com>
- Cc: Dave Caroline <dave.thearchivist@gmail.com>, Kenley Lamaute <kenleyl@microsoft.com>, "public-vocabs@w3.org" <public-vocabs@w3.org>
On Jul 29, 2012, at 6:49 AM, Tom Morris wrote:
> On Sat, Jul 28, 2012 at 5:47 PM, Martin Hepp <martin.hepp@ebusiness-unibw.org> wrote:
> I think there is a misunderstanding here: While it is *desirable* that an HTTP URI returns a representation when tried with a HTTP GET method, the role as a unique identifier *does not break* if the inventor of the URI goes bankrupt and stops serving representations from that URI.
>
> There's definitely a misunderstanding, but I'm not sure where it lies.
>
> If the domain registrant gives up their registration, for whatever reason, and the new domain owner starts minting new URIs in the same namespace, what implications does that have for the URIs that are now invalid (not because they don't resolve, but because they are no longer considered valid by the namespace owner).
>
> As Dan pointed out, it's a low probability event that needs to be dealt with in an out of band fashion, but it does happen.
I am not doubting that this can happen, but besides the low probability, I think that would violate the "sameness" and "identity" axioms of the Web architecture document:
http://www.w3.org/DesignIssues/Axioms.html#identity
"Axiom 2a: sameness
a URI will repeatably refer to "the same" thing"
and
"Axiom 2b: identity"
"the significance of identity for a given URI is determined by the person who owns the URI, who first determined what it points to."
I interpret this that even if someone it taking ownership over a domain name and its associated namespace, he or she must not change the meaning of existing identifiers, since a URI is owned by the person who first determined what it points to.
Also note the obvious: that the community can easily handle such cases by simply updating the data that points to the now obsolete model URIs.
Best
Martin
>
> Tom
>
> On Jul 28, 2012, at 1:36 PM, Dave Caroline wrote:
>
> > I can see a glaring hole in the URI as a unique identifier
> >
> > If large corp creates a product and defines the uri as
> > http:uri.largecorp.com/steamenginetype1
> >
> > Sells a million but goes bust a while later what of the id
> > we now have a dead link breaking the chain
>
> We only have a dead link for browsers, but the link is not dead for building a graph of statements.
>
> Best
> Martin
>
> --------------------------------------------------------
> martin hepp
> e-business & web science research group
> universitaet der bundeswehr muenchen
>
> e-mail: hepp@ebusiness-unibw.org
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>
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>
--------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen
e-mail: hepp@ebusiness-unibw.org
phone: +49-(0)89-6004-4217
fax: +49-(0)89-6004-4620
www: http://www.unibw.de/ebusiness/ (group)
http://www.heppnetz.de/ (personal)
skype: mfhepp
twitter: mfhepp
Check out GoodRelations for E-Commerce on the Web of Linked Data!
=================================================================
* Project Main Page: http://purl.org/goodrelations/
Received on Thursday, 2 August 2012 08:51:35 UTC