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Charles McCathieNevile | 1 Aug 2005 10:54
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Re: linking data with ontology


On Thu, 21 Jul 2005 21:48:29 +0200, <mmonroy <at> usbctg.edu.co> wrote:

>
> Hi.
>
> We are studing ontologies and we want to make an application to interact  
> with
> information regarding social problems in Colombia. We are realy confused  
> in how
> to separate ontologies from data. Probably we are confused in the  
> definition of
> the ontology but our main question is Where the ontology finish and  
> where the
> data begin?.

(noting that there is a spanish list that might be more useful - 'cause  
it's in spanish)

Hola Martin,

Quizas la lista web-semantica-ayuda - al menos para tener la discusion en  
castellano (suponiendo que lo hablais).

Creo que la pregunta que quieres es como definir la ontologia en si mismo,  
aparte de los datos para los cuales lo usan.

Por favor deja semantic-web <at> w3.org de cualquier respuesta en castellano ;-)

saludos
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Wolfgang Nejdl | 2 Aug 2005 20:11
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Open Ph.D. and PostDoc Positions, L3S, Hannover, Germany


The L3S Research Center, Hannover, Germany, invites applications for
Ph.D. and PostDoc research positions in the context of four new EU/IST
projects funded under the action lines "Semantic-Based Knowledge
Systems" and "Technology-Enhanced Learning and Access to Cultural
Heritage". The projects (NEPOMUK, PROLIX, TENCompetence and COOPER)
will start between November 2005 and March 2006.

Your research will focus (depending on the project) on some of the
following topics

- Semantic Web Data Management and Reasoning
- Federated Databases and Peer-to-Peer Systems
- Distributed Search and Information Retrieval
- Recommender Systems
- Service Oriented Architectures 
- Personalization and User Modelling

in a challenging and unique research environment.

You should possess excellent knowledge in one or several relevant
areas such as semantic web, databases and information systems,
information retrieval, web services, artificial intelligence, adaptive
systems, and distributed infrastructures.

Related work at L3S is focussing on distributed information systems
including advanced search and information retrieval as well as on
innovative knowledge and learning technologies with a strong focus on
semantic web technologies. For further information on projects and
other background see http://www.l3s.de/.
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Bernardo Cuenca Grau | 3 Aug 2005 04:11

DEADLINE APPROACHING. OWL: Experiences and Directions


> Apologies for cross-posting
>
> ************************************************************
> Call for Papers: "OWL: EXPERIENCES AND DIRECTIONS"
>
>  Galway, Ireland 11-12 November 2005
>  Workshop website:  http://www.mindswap.org/OWLWorkshop
>  Submission website: http://www.easychair.org/OWL-2005/submit
>
> Important Dates:
>
> Submissions due:            14th August, 2005
> Notification of acceptance: 5th September, 2005
> Final versions due:         30th September, 2005
> Workshop:                   11-12 November, 2005
>
> Publication: The Workshop proceedings will be published online by CEUR.
> Authors
>  of selected papers will be invited to submit an extended version of their
> paper
>  to Elsevier's Journal of Web Semantics. Those papers will be subject to a
> ``fast track''
>  reviewing process.
>
> Workshop Organisers:
>
> Bernardo Cuenca Grau, University of Maryland (USA)
> Ian Horrocks, University of Manchester (UK)
> Bijan Parsia, University of Maryland (USA)
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Lars Marius Garshol | 3 Aug 2005 16:32

The Q model


I have just presented a paper at Extreme Markup 2005 on the Q model,
which is a formal model which can represent both Topic Maps and RDF,
and moreover create structurally near-identical representations for
both.

This is quite relevant to the work of the RDFTM task force. The task
force is currently debating with itself whether to use the Q model in
its guidelines, or whether to take an informal approach.

Feedback on this (and of course on the paper/model itself) would be
very much welcome from any interested parties.

The paper:
<URL: http://www.ontopia.net/topicmaps/materials/quads.html >

Slides from presentation:
<URL: http://www.ontopia.net/topicmaps/materials/the-q-model.pdf >

--

-- 
Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
GSM: +47 98 21 55 50                  <URL: http://www.garshol.priv.no >
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Jan Algermissen | 3 Aug 2005 22:07

Re: The Q model


'Q'...as in Star Trek ?? :o)

Jan

On Aug 3, 2005, at 4:32 PM, Lars Marius Garshol wrote:

>
>
> I have just presented a paper at Extreme Markup 2005 on the Q model,
> which is a formal model which can represent both Topic Maps and RDF,
> and moreover create structurally near-identical representations for
> both.
>
> This is quite relevant to the work of the RDFTM task force. The task
> force is currently debating with itself whether to use the Q model in
> its guidelines, or whether to take an informal approach.
>
> Feedback on this (and of course on the paper/model itself) would be
> very much welcome from any interested parties.
>
> The paper:
> <URL: http://www.ontopia.net/topicmaps/materials/quads.html >
>
> Slides from presentation:
> <URL: http://www.ontopia.net/topicmaps/materials/the-q-model.pdf >
>
> --  
> Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
> GSM: +47 98 21 55 50                  <URL: http://
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Lars Marius Garshol | 3 Aug 2005 22:32

Re: The Q model


* Jan Algermissen
|
| 'Q'...as in Star Trek ?? :o)

I'm afraid not. I know nothing whatsoever about Star Trek. :)

--

-- 
Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
GSM: +47 98 21 55 50                  <URL: http://www.garshol.priv.no >
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Uldis Bojars | 3 Aug 2005 23:14
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Expressing rdfs:seeAlso in RDF/XML


Is there is a shorter way to express rdfs:seeAlso in RDF/XML than:

<Object1>
   <rdfs:seeAlso rdf:resource="URI"/>
</Object1>

You may omit blank nodes if properties have literal values:
  <ex:editor ex:fullName="Dave Beckett" />

Can you do a similar thing with properties whose values are resources,
as is the case with rdfs:seeAlso?

An example:
  <sioc:host_of rdfs:label="Label" rdf:resource="uri1" rdfs:seeAlso="uri2"/>

The rdfs:seeAlso part in this example is incorrect (would pass RDF/XML
parser though) because both the domain and range of rdfs:seeAlso
should be resources, but "uri2" in this example would be interpreted
as a literal.

--

-- 
Best regards,
Uldis Bojars

[ http://captsolo.net/info/ ]
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Danny Ayers | 4 Aug 2005 00:55
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Re: Expressing rdfs:seeAlso in RDF/XML


On 8/3/05, Uldis Bojars <uldis.bojars <at> gmx.net> wrote:
> 
> 
> Is there is a shorter way to express rdfs:seeAlso in RDF/XML than:
> 
> <Object1>
>    <rdfs:seeAlso rdf:resource="URI"/>
> </Object1>
> 
> You may omit blank nodes if properties have literal values:
>   <ex:editor ex:fullName="Dave Beckett" />
> 
> Can you do a similar thing with properties whose values are resources,
> as is the case with rdfs:seeAlso?

Heh, fun. Best I could find was:

<rdf:Description rdf:about="http://www.w3.org/">
    <rdfs:seeAlso rdf:resource="http://example.org/uri2"/>
</rdf:Description>

gets more value-for-character with labels:

<rdf:Description rdf:about="http://www.w3.org/"  rdfs:label="LabelS">
    <rdfs:seeAlso rdf:resource="http://example.org/uri2" rdfs:label="LabelO"/>
</rdf:Description>

it's a bit late here to check danbri's notes [1] to find why
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Andrea Splendiani | 4 Aug 2005 04:00
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Question about rdf:first and validation error in enumerated datatype range

Hi all,

I have problems with a piece of an ontology where the validator 
complains about the object of the rdf:first property not being a 
resource. However it seems this is possible:

 From the enumerated data type example in the official documentation I 
get:

<owl:DatatypeProperty rdf:ID="tennisGameScore">
   <rdfs:range>
     <owl:DataRange>
       <owl:oneOf>
         <rdf:List>
            <rdf:first rdf:datatype="&xsd;integer">0</rdf:first>
            <rdf:rest>
              <rdf:List>
                <rdf:first rdf:datatype="&xsd;integer">15</rdf:first>
                <rdf:rest>
                  <rdf:List>
                    <rdf:first rdf:datatype="&xsd;integer">30</rdf:first>
                    <rdf:rest>
                      <rdf:List>
                        <rdf:first 
rdf:datatype="&xsd;integer">40</rdf:first>
                        <rdf:rest rdf:resource="&rdf;nil" />
                      </rdf:List>
                    </rdf:rest>
                  </rdf:List>
               </rdf:rest>
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Lars Marius Garshol | 4 Aug 2005 20:52

Re: The Q model


Hi Peter,

* Peter F. Patel-Schneider
|
| I am puzzled why you say that if RDF can be transformed into Q with
| no loss of information then OWL/RDFS semantics can be ported to it.

Hmmm. I think probably you're reading more into this statement than I
intended by it. Clearly, RDF represented in Q is still the same RDF,
and so the same OWL/RDFS semantics will apply as when RDF is just
triples, but, as you note below, this will be a semantics that ignores
the two extra elements. 

| Both RDFS and OWL have a non-trivial semantics that may not survive
| the changes from simple statements to identified and situated
| statements very well.  Do you have a fully-worked-out version of
| RDFS and OWL in this arena?

No, I do not. I think I can see a way to take context into account,
but I don't have this worked out, and it's definitely possible that
taking the two extra elements into account will break it.

| Similarly, how do the RDF semantic conditions play into the story,
| particularly with the inclusion of contexts in the Q model?

I've not been able to work this out yet. This paper takes me to the
point where I have RDF and Topic Maps in a single model, but no
semantics for this unified model yet. One obvious next step is to
create a unified semantics based on this model.
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