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Re: [Dbpedia-discussion] DBPedia: http://dbpedia.org/resource/Marcos_Escobedo

From: Aldo Gangemi <aldo.gangemi@cnr.it>
Date: Mon, 11 Feb 2013 20:51:04 +0100
Cc: Aldo Gangemi <aldo.gangemi@cnr.it>, mariano.rico@uam.es, "dbpedia-discussion@lists.sourceforge.net" <dbpedia-discussion@lists.sourceforge.net>, "public-lod@w3.org" <public-lod@w3.org>, Vishal Sinha <vishal.sinha777@yahoo.com>
Message-Id: <B196281A-E860-45AC-A294-5AD02FCEE227@cnr.it>
To: Jona Christopher Sahnwaldt <jcsahnwaldt@gmail.com>
Hi, this is one example of the limits in producing an ontology without considering the full range of data that it has to provide a schema for.
See e.g. [1] for an approach of deriving "ontology patterns" from data, in order to optimize the semantics of the ontology.

In DBpedia, one may want to establish one or more thresholds (even contextual or dynamic) for including alternative types in the domain/range of properties.

Vishal's example spots the optimism of mapping dbpprop:allegiance directly to dbpedia-owl:country, while dbpprop:allegiance can range on the following types:

http://schema.org/Place 	8797
http://schema.org/Organization 	665
http://schema.org/Person 	182
http://schema.org/Event 	8
http://dbpedia.org/ontology/EthnicGroup 	8

i.e. about 855 out of 9660 (almost 9%) are not places (let alone countries, which are 8336, i.e. 86%). That would make a 14% error rate on the declared range, quite a lot.

The approach described in [1] would lead to a different mapping:

dbpedia-owl:allegiance:
	domain: dbpedia-owl:Agent
	range: dbpedia-owl:Agent owl:union dbpedia-owl:EthnicGroup owl:union dbpedia-owl:Event owl:union dbpedia-owl:Place

Best
Aldo

[1] Presutti V., Aroyo L., Adamou A., Schopman B., Gangemi A., Schreiber G. Extracting Core Knowledge from Linked Data. Proceedings of the Second Workshop on Consuming Linked Data, COLD2011, Workshop in conjunction with the 10th International Semantic Web Conference 2011 (ISWC 2011), http://ceur-ws.org/Vol-781/, 2011.


On Feb 11, 2013, at 7:16:14 PM , Jona Christopher Sahnwaldt <jcsahnwaldt@gmail.com> wrote:

> 
> On Feb 11, 2013 1:34 PM, "Mariano Rico" <mariano.rico@gmail.com> wrote:
> >
> > Hi Vishal,
> >
> > it is not a matter of mappings, it is a matter of wikipedia.
> > If you edit the wikipedia page "Marcos Escobedo" you will see in the infobox:
> > |allegiance=[[Miguel Hidalgo]]
> >
> > this means a link to the wikipedia page "Miguel Hidalgo", which is a desambiguation page (http://en.wikipedia.org/w/index.php?title=Miguel_Hidalgo&redirect=no ) with a UNIQUE value: "Miguel Hidalgo y Costilla".
> >
> > A solution could be to change the link to the "State" Miguel Hidalgo (http://en.wikipedia.org/wiki/Hidalgo_(state)) instead of the "Person" Miguel Hidalgo.
> 
> That would be incorrect. According to http://en.wikipedia.org/wiki/Marcos_Escobedo , he "...put himself at the service of independence leader Miguel Hidalgo".
> 
> JC
> 
> > Best regards,
> >
> > Saludos cordiales,
> >
> > -Mariano
> >
> >
> > On Mon, Feb 11, 2013 at 12:01 PM, Vishal Sinha <vishal.sinha777@yahoo.com> wrote:
> >>
> >> Hi,
> >>  
> >> The following resource in DBPedia:
> >> <http://dbpedia.org/resource/Marcos_Escobedo> is a Person.
> >>  
> >> which has a country:
> >> <http://dbpedia.org/resource/Miguel_Hidalgo_y_Costilla> , but in fact that is also a Person.
> >>  
> >> How is this possible?
> >>  
> >>  
> >>  
> >>  
> >>  
> >>
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Received on Monday, 11 February 2013 19:51:37 UTC

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