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Re: Indicating Skolem Nodes (was Re: AW: {Disarmed} Re: blank nodes (once again))

From: Pat Hayes <phayes@ihmc.us>
Date: Fri, 25 Mar 2011 23:05:07 -0500
Cc: Sandro Hawke <sandro@w3.org>, Steve Harris <steve.harris@garlik.com>, semantic-web@w3.org
Message-Id: <05DEA181-E8FB-43D7-9D1C-E705581AFB46@ihmc.us>
To: David Booth <david@dbooth.org>

On Mar 25, 2011, at 10:44 PM, David Booth wrote:

> On Fri, 2011-03-25 at 23:04 -0400, Sandro Hawke wrote:
>> On Fri, 2011-03-25 at 13:23 -0500, Pat Hayes wrote:
>>> BTW, I think that skolem URIs should NOT be dereferencable, as a
>> matter of design. If you want to put a 'real' URI name in there, you
>> always have that option: but then (for example) changing it will make
>> a non-equivalent graph (as it should). 
> 
> I am stunned that folks are even discussing new URI schemes for this,
> when linked data has clearly -- once again -- demonstrated the benefits
> of *dereferenceable* URIs. 

BUt remember, we are talking about the 'blank nodes' in the linked data. 
> 
> Please, at *least* make it dereferenceable to *some* kind of useful
> information.

How? These are supposed to be automatically generated and globally unique. Will you have the skolemizing process also generate a web page somewhere, one for each skolem constant? Who will host these millions of empty pages with no information in them? The idea simply does not make sense.  And it does not make semantic sense. A skolem URI is not an identifier: it is simply a URi token generated to indicate the plain existence of something. 

>  In the very least, it could be information about how
> bnodes are skolomized.

There is no such information. Any information about the skolem constant is contained in the constant itself, ie the text of URI itself.

>  Nobody is required to dereference a URI.  But it
> is helpful to have the *option* of deferencing an identifier to learn
> more about it.  

Quite. But these are not identifiers, and there is nothing more to be learnt about them.

Pat


> 
> 
> -- 
> David Booth, Ph.D.
> http://dbooth.org/
> 
> Opinions expressed herein are those of the author and do not necessarily
> reflect those of his employer.
> 
> 

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Received on Saturday, 26 March 2011 04:05:44 UTC

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