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Making Semantics optional (was: Re: [All] Proposal: RDF Graph Identification)

From: Richard Cyganiak <richard@cyganiak.de>
Date: Wed, 22 Aug 2012 23:33:56 +0100
Cc: Pat Hayes <phayes@ihmc.us>, Ivan Herman <ivan@w3.org>, David Wood <david@3roundstones.com>, "Peter F. Patel-Schneider" <pfpschneider@gmail.com>, W3C RDF WG <public-rdf-wg@w3.org>
Message-Id: <BEC55950-00C4-44F3-8AA5-D0EAEB5B374A@cyganiak.de>
To: Sandro Hawke <sandro@w3.org>
On 20 Aug 2012, at 16:14, Sandro Hawke wrote:
> We'd just be separating the RDF semantics from the RDF model and syntax.   It would now be okay, according to the spec, to use the RDF model and syntax without using the RDF semantics.

In RDF 1.1, it's already okay to use RDF Concepts without "using" RDF Semantics. The Conformance section of RDF Concepts doesn't say anything to the contrary. I don't know how it could require "use" of RDF Semantics, given that RDF Semantics doesn't have any notion of what it means to "use" the semantics, doesn't have any conformance criteria, and doesn't define any terminology that RDF Concepts "imports".

So the status quo given the current RDF 1.1 Concepts draft is that RDF Semantics is *the* normative spec that defines how to read RDF graphs as a logic *in case one wants to do that*, and essentially defines an entailment regime over RDF graphs *in case one needs one*.

Best,
Richard





> 
> OWL and RIF, because they chose to use the RDF semantics, would of course be bound by them.
> 
>   -- Sandro
> 
> 
> 
>> Pat
>> 
>>> (Of course, one can argue that OWL2 refers to the 2004 version of RDF, but if we supersede the 2004 version with RDF 1.1 this may not hold either.)
>>> 
>>> Ivan
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> Pat
>>>> 
>>>>> 
>>>>>> In fact, the OWL specs could be rewritten much more simply if RDF had no semantics at all.
>>>>> "Could be": maybe. But will not be...
>>>>> 
>>>>> Ivan
>>>>> 
>>>>>> I think something similar is true for RIF, but Sandro can speak to that with more authority.
>>>>>> 
>>>>>> Pat
>>>>>> 
>>>>>>> Regards,
>>>>>>> Dave
>>>>>>> 
>>>>>>> [1] http://www.w3.org/TR/owl-semantics/#references-normative
>>>>>>> 
>>>>>>> 
>>>>>>>> Ivan
>>>>>>>> 
>>>>>>>> 
>>>>>>>>> ------------------------------------------------------------
>>>>>>>>> IHMC                                     (850)434 8903 or (650)494 3973
>>>>>>>>> 40 South Alcaniz St.           (850)202 4416   office
>>>>>>>>> Pensacola                            (850)202 4440   fax
>>>>>>>>> FL 32502                              (850)291 0667   mobile
>>>>>>>>> phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 
>>>>>> ------------------------------------------------------------
>>>>>> IHMC                                     (850)434 8903 or (650)494 3973
>>>>>> 40 South Alcaniz St.           (850)202 4416   office
>>>>>> Pensacola                            (850)202 4440   fax
>>>>>> FL 32502                              (850)291 0667   mobile
>>>>>> phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>> 
>>>>> ----
>>>>> Ivan Herman, W3C Semantic Web Activity Lead
>>>>> Home: http://www.w3.org/People/Ivan/
>>>>> mobile: +31-641044153
>>>>> FOAF: http://www.ivan-herman.net/foaf.rdf
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>> ------------------------------------------------------------
>>>> IHMC                                     (850)434 8903 or (650)494 3973
>>>> 40 South Alcaniz St.           (850)202 4416   office
>>>> Pensacola                            (850)202 4440   fax
>>>> FL 32502                              (850)291 0667   mobile
>>>> phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> ----
>>> Ivan Herman, W3C Semantic Web Activity Lead
>>> Home: http://www.w3.org/People/Ivan/
>>> mobile: +31-641044153
>>> FOAF: http://www.ivan-herman.net/foaf.rdf
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>> ------------------------------------------------------------
>> IHMC                                     (850)434 8903 or (650)494 3973
>> 40 South Alcaniz St.           (850)202 4416   office
>> Pensacola                            (850)202 4440   fax
>> FL 32502                              (850)291 0667   mobile
>> phayesAT-SIGNihmc.us       http://www.ihmc.us/users/phayes
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> 
> 
Received on Wednesday, 22 August 2012 22:34:25 UTC

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