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Re: RDF-ISSUE-12 (String Literals): Reconcile various forms of string literals (time permitting) [Cleanup tasks]

From: Antoine Zimmermann <antoine.zimmermann@insa-lyon.fr>
Date: Mon, 07 Mar 2011 18:31:45 +0100
Message-ID: <4D751681.5040708@insa-lyon.fr>
To: Ivan Herman <ivan@w3.org>
CC: Steve Harris <steve.harris@garlik.com>, Andy Seaborne <andy.seaborne@epimorphics.com>, Sandro Hawke <sandro@w3.org>, Pat Hayes <phayes@ihmc.us>, RDF Working Group WG <public-rdf-wg@w3.org>
Le 07/03/2011 10:06, Ivan Herman a écrit :
>
> On Mar 6, 2011, at 19:32 , Steve Harris wrote:
>
>> On 2011-03-06, at 16:37, Andy Seaborne wrote:
>>> On 06/03/11 08:12, Steve Harris wrote:
>>>>> What about just saying, "please don't use xs:string any more", and
>>>>> "if
>>>>>> you (some RDF software) find an xs:string, you SHOULD convert it
>>>>>> to a plain literal".  Would that pretty much solve the problem?
>>>> That's the inverse of what I suggested just before I read this mail.
>>>> It works for me (from a storage point of view it's probably simpler),
>>>> but I understand that it's not ideal for some reasoning systems?
>>>
>>> the inverse was:
>>> On 06/03/11 07:59, Steve Harris wrote:
>>>>     "foo"^^xsd:string  ->    "foo"^^xsd:string
>>>>     "foo"  ->    "foo"^^xsd:string
>>>>     "foo"@de  ->    "foo"^^xsd:string @de
>>>
>>>
>>> I think it works better as
>>>
>>> "foo"^^xsd:string ->  "foo"
>>> "foo"@de  ->    "foo"@de
>>
>> I agree, but someone, possibly Pat said there was an issue with untyped literals and reasoning.
>>
>
> AFAIK, no reasoning is defined on non-datatyped literals...

What do you mean by that?
There is a formal semantics which defines well what plain literals mean. 
Reasoning can be performed on documents with both plain literals and 
typed literals. Still, as far as I understand it, reasoning and plain 
literals don't go well together and that's why rdf:plainLiteral was 
defined. It basically makes all literals "typed".


Regards,
-- 
Antoine Zimmermann
Researcher at:
Laboratoire d'InfoRmatique en Image et Systèmes d'information
Database Group
7 Avenue Jean Capelle
69621 Villeurbanne Cedex
France
Lecturer at:
Institut National des Sciences Appliquées de Lyon
20 Avenue Albert Einstein
69621 Villeurbanne Cedex
France
antoine.zimmermann@insa-lyon.fr
http://zimmer.aprilfoolsreview.com/
Received on Monday, 7 March 2011 17:32:18 UTC

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