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Re: Use of XSD namespace in RDF recommendations

From: Antoine Zimmermann <antoine.zimmermann@emse.fr>
Date: Wed, 05 Sep 2012 16:41:39 +0200
Message-ID: <504764A3.7040603@emse.fr>
To: Richard Cyganiak <richard@cyganiak.de>
CC: public-rdf-comments@w3.org
Le 05/09/2012 15:58, Richard Cyganiak a écrit :
> [...]
 >
> Thanks, not too bad! Here's a slight rewording, does this still sound
> ok?
>
> [[ Note: The Web Ontology Language [OWL2] offers [facilities for
> formally defining custom
> datatypes](http://www.w3.org/TR/owl2-syntax/#Datatype_Definitions)
> that can be used with RDF. However, RDF implementations are not
> required to support these facilities. ]]

Very concise, good for me.


-AZ


>
> Best, Richard
>
>
>>
>>
>> AZ.
>>
>> Le 04/09/2012 21:36, Richard Cyganiak a écrit :
>>> Ivan, Antoine, Dan, Richard, Jeremy,
>>>
>>> I guess I like the idea of informatively linking to both the
>>> 2006 SWBP Note on datatypes [1] and to the OWL 2 datatype
>>> definition mechanism [2], stating that both XML Schema and OWL 2
>>> provide facilities for formally defining RDF datatypes, but that
>>> support for neither mechanism is required for RDF.
>>>
>>> Jeremy: Is [1] still considered up-to-date, or should we avoid
>>> drawing attention to it?
>>>
>>> Antoine, Ivan, Dan: Perhaps one of you wants to take a stab at
>>> drafting a sentence that could be inserted into the Datatypes
>>> section [3] as another Note?
>>>
>>> Cheers, Richard
>>>
>>> [1] http://www.w3.org/TR/swbp-xsch-datatypes/ [2]
>>> http://www.w3.org/TR/owl2-syntax/#Datatype_Definitions [3]
>>> http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-concepts/index.html#section-Datatypes
>>>
>>>
>>>
>>>
>>>
On 4 Sep 2012, at 18:38, Ivan Herman wrote:
>>>
>>>> Dan,
>>>>
>>>> the question is of course justified, but I should also add
>>>> that, in fact, very very few people use xmls schema datatype
>>>> definitions together with RDF, too. In both cases the
>>>> difficulty is identical: to understand and process those
>>>> datatypes an external 'tool' has to be brought in: either an
>>>> xml schema or an owl processor... Mainly in a non-XML RDF world
>>>> (ie, as Richard said, with a diminishing usage of RDF/XML) the
>>>> chance of using XML schema based derived datatypes is getting
>>>> smaller and smaller in my view.
>>>>
>>>> I find the OWL 2 datatype definition possibilities one of the
>>>> most interesting and potentially important part of OWL 2. I
>>>> actually wish the relevant part of the specification was also
>>>> made more known and possibly used in isolation; at present it
>>>> is burried in the overall OWL 2 spec, which is of course not an
>>>> easy read...
>>>>
>>>> (Maybe it is worth some extra blog/note)
>>>>
>>>> Ivan
>>>>
>>>> --- Ivan Herman Tel:+31 641044153 http://www.ivan-herman.net
>>>>
>>>> (Written on mobile, sorry for brevity and misspellings...)
>>>>
>>>>
>>>>
>>>> On 4 Sep 2012, at 15:37, Dan Brickley<danbri@danbri.org>
>>>> wrote:
>>>>
>>>>> On 4 September 2012 21:11, Antoine Zimmermann
>>>>> <antoine.zimmermann@emse.fr>   wrote:
>>>>>> FWIW, OWL 2 has a feature to define custom datatypes that
>>>>>> can be written completely in RDF, without using XML
>>>>>> Schema.
>>>>>>
>>>>>> Your example for Chapman codes can be written as follows,
>>>>>> in Turtle syntax:
>>>>>>
>>>>>> @prefix geo:<http://www.example.com/geo#>  @prefix
>>>>>> xsd:<http://www.w3.org/2001/XMLSchema#>  @prefix
>>>>>> owl:<http://www.w3.org/2002/07/owl#>  @prefix
>>>>>> rdfs:<http://www.w3.org/2000/01/rdf-schema#>
>>>>>>
>>>>>> geo:chapman-code  a  rdfs:Datatype; owl:equivalentClass  [
>>>>>> a rdfs:Datatype; owl:onDatatype  xsd:string;
>>>>>> owl:withRestriction ( [xsd:pattern "[a-zA-Z]{3}"] ) ] .
>>>>>
>>>>> Interesting! Are many of these showing up "in the wild" yet?
>>>>>
>>>>> Dan
>>>>>
>>>>
>>>
>>>
>>>
>>
>> -- Antoine Zimmermann ISCOD / LSTI - Institut Henri Fayol École
>> Nationale Supérieure des Mines de Saint-Étienne 158 cours Fauriel
>> 42023 Saint-Étienne Cedex 2 France Tél:+33(0)4 77 42 66 03
>> Fax:+33(0)4 77 42 66 66 http://zimmer.aprilfoolsreview.com/
>>
>
>

-- 
Antoine Zimmermann
ISCOD / LSTI - Institut Henri Fayol
École Nationale Supérieure des Mines de Saint-Étienne
158 cours Fauriel
42023 Saint-Étienne Cedex 2
France
Tél:+33(0)4 77 42 66 03
Fax:+33(0)4 77 42 66 66
http://zimmer.aprilfoolsreview.com/
Received on Wednesday, 5 September 2012 14:42:05 UTC

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