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Re: SKOS queries

From: Antoine Isaac <aisaac@few.vu.nl>
Date: Fri, 28 Sep 2007 15:08:56 +0200
Message-ID: <46FCFCE8.2090107@few.vu.nl>
To: Quentin Reul <qreul@csd.abdn.ac.uk>
CC: SWD WG <public-swd-wg@w3.org>

Hi Quentin,

I won't answer on transitivity, I think I agree with Sean.
For the second point your feedback is much appreciated! Thanks for the 
reading and reacting effort.
And for the last point, if by "ambiguity" you mean "mapping", then yes, 
we will work on that.

Cheers,

Antoine

> Hi Antoine,
>
> The goal of SKOS is to share knowledge organisation, such as thesauri 
> over the web. Imagine that a user defines a thesaurus containing only 
> skos:broader relations between skos:Concept. If skos:broader and 
> skos:narrower are not transitive, a user x who wants to use this 
> thesaurus to find all narrower concepts of a concept will have to add 
> the relation to every concept in the thesaurus. Hence, transitivity 
> between these relations enable a better sharing among user.
>
> Looking at [1], I realised that my question is already covered. I have 
> reviewed the different solutions proposed. I believe that solution 4 
> (mixing 1 and 2), despite is cons, would be most appropriate. SKOS 
> relations such as skos:definition and skos:altLabel offer more 
> information about the concept described whereas skos:broader and 
> skos:narrower describes relations between terms (in my view anyway). 
> Furthermore, FOAF and Dublin Core are sometimes used in OWL ontologies 
> to add information about concept or the ontology itself.
>
> Lastly, I was wondering if the group was planning on addressing the 
> question of ambiguity between terms.
>
> Cheers,
>
> Quentin
>
> [1] http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ConceptSemantics
>
> Antoine Isaac wrote:
>> Hi Quentin,
>>>
>>> I understood that skos:narrower and skos:broader are inverses. And I 
>>> guess my question is actually going to be covered as part of the f2f 
>>> in Amsterdam [1] in a few weeks time. My personal opinion is that 
>>> these should be transitive in a similar manner to rdfs:subClass in 
>>> OWL especially if users want to be able to get information through 
>>> inference.
>>
>> Do you have a specific application which requires this? For the 
>> moment my personal opinion is rather not enthousiastic about 
>> transitivity, and it's grounded in some practical concerns. I guess 
>> other workgroup member will come with strong arguments for 
>> transitivity, but the more practical cases we can discuss, the better...
>>
>>>
>>> Another question that comes to mind is whether SKOS is intended to 
>>> be used as stand-alone or within an ontology. As part of the project 
>>> I work on, we have used SKOS properties such as skos:definition to 
>>> define concept label in OWL ontologies. But I also can see some 
>>> applications where SKOS can be used to represent thesaurus on its own.
>>
>> Your sentence is unclear: do my scribblings in [1]  cover this problem?
>>
>> Cheers,
>>
>> Antoine
>>
>> [1] http://www.w3.org/2006/07/SWD/wiki/SkosDesign/ConceptSemantics
>>>
>>>
>>> Sean Bechhofer wrote:
>>>>
>>>> On 24 Sep 2007, at 11:41, Quentin Reul wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I have looked at different aspects of SKOS and I have got a few 
>>>>> questions as a result:
>>>>>
>>>>> First of all, I was wondering if there was any reasoner available 
>>>>> to create a thesaurus tree and find out all the different terms 
>>>>> that are "broader/narrower" for a given term.
>>>>>
>>>>> My understanding is that the "broader/narrower" relationship is 
>>>>> transitive, i.e. if the user adds a term has being broader, this 
>>>>> term would have the previous term as narrower without having to 
>>>>> add the statement to the second term.
>>>>
>>>> Broader/narrower are intended to be *inverses*, which I think is 
>>>> what you mean here.
>>>>
>>>> The transitivity of broader/narrower is one of the topics that's up 
>>>> for discussion at the F2F. See "Semantic Relation Properties" in [1].
>>>>
>>>> Cheers,
>>>>
>>>>     Sean
>>>>
>>>> [1] http://www.w3.org/2006/07/SWD/wiki/AmsterdamAgenda
>>>>
>>>> -- 
>>>> Sean Bechhofer
>>>> School of Computer Science
>>>> University of Manchester
>>>> sean.bechhofer@manchester.ac.uk
>>>> http://www.cs.manchester.ac.uk/people/bechhofer
>>>>
>>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> Quentin H. Reul
>>> Computing Science
>>> University of Aberdeen
>>>
>>> +44 (0)1224 27 *4485*
>>> qreul@csd.abdn.ac.uk
>>> http://www.csd.abdn.ac.uk/~qreul
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
Received on Friday, 28 September 2007 13:09:16 UTC

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