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

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 26 May 2009 11:57:42 -0400
Message-ID: <4A1C1176.7050106@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>
Wolfgang Orthuber wrote:
> 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?
The URL can be used as an Identifier because you can use a globally 
unique Resource Location/Address as a Name for a Thing (e.g. a 
Document), albeit with implications (i.e. mobility of the Thing you name).
> (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)
<http://www.orthuber.com/wp1.pdf> is the Web Address constrained URI 
(nee. URL) for the resource: wp1.pdf exposed to the Web via an HTTP 
server.  I've made no mention of "all defining information" .

Kingsley
>
> 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
>>
>>
>>
>>
>>
>>
>
>


-- 


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 15:58:25 GMT

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