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Re: Suggestion for SKOS FAQ

From: Andreas Langegger <al@jku.at>
Date: Fri, 7 Mar 2008 22:54:51 +0100
To: Simon Spero <ses@unc.edu>
Message-Id: <73AB193C-808B-431C-B0C9-26387A35F3AC@jku.at>
Cc: "iperez@babel.ls.fi.upm.es" <iperez@babel.ls.fi.upm.es>, SKOS <public-esw-thes@w3.org>

Dear Simon,

thanks for the pointer to issue-44. I didn't read deep into the  
thread. But as Antoine pointed out, there is the transitive version  
also (obviously the result of the issue-44 discussion). So both kinds  
of semantics can be expressed in the model and are not defined by the  
application.

Best regards,
Andy

On Mar 6, 2008, at 9:54 PM, Simon Spero wrote:

> Andy-
> Unfortunately SKOS currently can't support the kinds of inference  
> you mention; it used to, but The Hierachical
> Relationship was been removed in the latest draft for reasons which  
> aren't entirely obvious.
>
> Before these changes SKOS did provide this relationship in the form  
> of the unqualifed skos:broader property. This corresponded directly  
> to the Broader Term relationship which thesauri define in terms of  
> document retrieval.
>
> The Hierachical Relationship is not necessarily valid when  
> considered in terms of the underlying instances and classes of an  
> OWL style ontology- it can happily cross BTP and BTG boundaries, etc.
>
> Currently the remaining vaue in SKOS comes from the label  
> properties. These can be used with RDFS and OWL.
>
> See the discussions related to Issue-44 for more information.
>
> Simon
> Sent from my iPhone
>
> On Mar 5, 2008, at 11:25 AM, Andreas Langegger <al@jku.at> wrote:
>
>>
>> Dear SKOSsers,
>>
>> ....and I would like to add these:
>>
>> * When using Jena (for example), which reasoner can be used to make  
>> inference on topics?
>> * How do I setup this such that a query like:
>> SELECT * WHERE { ?b a :Book; skos:subject c:Sports } also fetches  
>> Books about Golf, Skiing, Wakeboarding, etc.
>>
>> Subsumption reasoning over classes is simple but effective for such  
>> taxonomies like SKOS can be used for. And it should also work for  
>> transitivity of properties that way. Because I think one of the  
>> strange feelings about SKOS is the question, will I be worse off  
>> when using SKOS instead of simple RDF Schema class hierarchies? At  
>> least we are currently thinking about this because we would like to  
>> use SKOS in a project.
>>
>> Thanks,
>> Andy
>>
>> On Mar 3, 2008, at 11:23 AM, Iván Pérez Domínguez wrote:
>>
>>>
>>> Hi,
>>> I've been reading about skos and I have a few questions that might  
>>> make it to the FAQ page:
>>> * What's is SKOS?
>>> (after some nice description gives not much information)
>>> * No, seriously, what is SKOS?
>>>
>>> * When should I use it?
>>>
>>> * When should I not use it?
>>>
>>> * Can I use skos to model <specific problem>?
>>>
>>> I think this would be a nice starting point.
>>>
>>> Cheers,
>>> Iván.
>>>
>>>
>>
>>
>> ----------------------------------------------------------------------
>> Dipl.-Ing.(FH) Andreas Langegger
>> Institute for Applied Knowledge Processing
>> Johannes Kepler University Linz
>> A-4040 Linz, Altenberger Straße 69
>> http://www.langegger.at
>>
>>
>>


----------------------------------------------------------------------
Dipl.-Ing.(FH) Andreas Langegger
Institute for Applied Knowledge Processing
Johannes Kepler University Linz
A-4040 Linz, Altenberger Straße 69
http://www.langegger.at
Received on Friday, 7 March 2008 21:55:12 GMT

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