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Re: numeric web search (Was: URLs instead of URNs)

From: Wolfgang Orthuber <orthuber@kfo-zmk.uni-kiel.de>
Date: Tue, 26 May 2009 17:19:43 +0100
Message-ID: <001801c9de1d$c73cd3c0$a3b35ec2@workstation>
To: "Kingsley Idehen" <kidehen@openlinksw.com>
Cc: "Dan Brickley" <danbri@danbri.org>, "semantic-web" <semantic-web@w3.org>, "Linked Data community" <public-lod@w3.org>
We know that a URL refers to a (unique) web address. If also
A URL is a Web Address based Identifier
then the Web Address determines also the URL. Because the Web address is globally unique, the URL is unique
and can be used as unique identifier.
Is this correct?
(then I could write that the pattern name in http://www.orthuber.com/wp1.pdf is a URL, because it is based on
the location of a unique "linking file" which points to all defining information)

Wolfgang

----- Original Message ----- 
From: "Kingsley Idehen" <kidehen@openlinksw.com>
To: "Wolfgang Orthuber" <orthuber@kfo-zmk.uni-kiel.de>
Cc: "Dan Brickley" <danbri@danbri.org>; "semantic-web" <semantic-web@w3.org>; "Linked Data community"
<public-lod@w3.org>
Sent: Tuesday, May 26, 2009 3:04 PM
Subject: Re: numeric web search (Was: URLs instead of URNs)


> Wolfgang Orthuber wrote:
>> Dan,
>>
>> can a http URI refer transiently or accidentally to some address?
> Of course.
>> Which term do you suggest for something which permanently refers to a (unique, permanent) web address, and
>> which differs if and only if the web address differs?
> A URI that carries location/address specificity or dependency (transiently or accidentally).
>
> An Identifier with endowed location specificity (overtly or covertly) isn't optimal, but that doesn't stop
> it being an identifier.
>
> A URL is a Web Address based Identifier -- a URI :-)
>
>
>
> Kingsley
>>
>> Wolfgang
>>
>> ----- Original Message ----- From: "Dan Brickley" <danbri@danbri.org>
>> To: "Wolfgang Orthuber" <orthuber@kfo-zmk.uni-kiel.de>
>> Cc: "semantic-web" <semantic-web@w3.org>; "Linked Data community" <public-lod@w3.org>
>> Sent: Tuesday, May 26, 2009 1:31 PM
>> Subject: Re: numeric web search (Was: URLs instead of URNs)
>>
>>
>>> On 26/5/09 15:17, Wolfgang Orthuber wrote:
>>>> Dan,
>>>>
>>>> in http://www.w3.org/TR/uri-clarification/ I read "An http URI is a URL"
>>>> . So I concluded that a different http URI is a different URL (address).
>>>> At this I assumed, that all http URIs which refer to the same address
>>>> (case insensitive), are defined as "identical". Is this correct?
>>>
>>> I'd rather they'd have said "URL" is a technically obsolete but common colloquial term for http and
>>> http-like URIs. Identity of identifiers is tricky because you have to try to distinguish between
>>> identifiers which accidentally of transiently refer to the same thing, versus those where it is built-in
>>> to the definition of the scheme (eg. the port 80 and domain name canonicalisation rules).
>>>
>>> Dan
>>>
>>>
>>
>>
>>
>
>
> -- 
>
>
> Regards,
>
> Kingsley Idehen       Weblog: http://www.openlinksw.com/blog/~kidehen
> President & CEO OpenLink Software     Web: http://www.openlinksw.com
>
>
>
>
>
>
Received on Tuesday, 26 May 2009 15:22:11 UTC

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