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Re: complete graphs

From: Pat Hayes <phayes@ihmc.us>
Date: Sun, 2 Oct 2011 22:03:47 -0500
Cc: public-rdf-wg@w3.org
Message-Id: <037B8342-B5AC-458F-9D13-B36AF9FE729B@ihmc.us>
To: Andy Seaborne <andy.seaborne@epimorphics.com>

On Oct 1, 2011, at 11:09 AM, Andy Seaborne wrote:

> 
> 
> On 30/09/11 19:46, Sandro Hawke wrote:
>> On Fri, 2011-09-30 at 15:04 +0100, Andy Seaborne wrote:
>>> 
>>> On 30/09/11 13:59, Lee Feigenbaum wrote:
>>>> On 9/30/2011 8:44 AM, Peter Frederick Patel-Schneider wrote:
>>>>> From: Sandro Hawke<sandro@w3.org>
>>>>> Subject: Re: complete graphs
>>>>> Date: Fri, 30 Sep 2011 07:31:26 -0500
>>>>> 
>>>>> [...]
>>>>> 
>>>>>> The restriction on the fourth column is that the fourth column is the
>>>>>> web address of a place (a g-box) currently serving that triple.
>>>>>> (That's the architecture I'm arguing for in this morning's post to
>>>>>> public-rdf-prov [1].)
>>>>> 
>>>>> You are going to build this into the formal meaning of RDF?
>>>>> That's a non-starter for me.
>>>> 
>>>> If I understand it correctly, I think it's a non-starter for me as well.
>>>> This would prohibit non-HTTP URIs from being used to as the 4th element
>>>> in a quad (i.e. as the identifier of a named graph)?
>>>> 
>>>> Lee
>>> 
>>> I understood Sandro's remark coming out of the discussion about
>>> provenance on the web and so I took generalising to any URI scheme for
>>> other situations as read.
>> 
>> Right.   More formally, I'd say the fourth column is the identifier (IRI
>> or BNode) of an Information Resource which MAY provide representations.
>> If it does provide representations, it SHOULD provide an RDF
>> representation (a g-text).   If you want to use a non-dereferenceable
>> IRI scheme like uuid or tag, that's not good Linked Data but it's fine
>> RDF.  Informally, the fourth column entry denotes a g-box, but I'm not
>> convinced g-boxes should be formalized.
> 
> BNode?  Such a bNode is outside any graph so how does its semantics work? (I'm not saying it does not work - but I don't see how it would.)

OK, I am saying it does not work. At the very least it would have to be a bnode identifier, not a bnode. 

Pat

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Received on Monday, 3 October 2011 03:04:24 GMT

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