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Re: [Dbpedia-discussion] Fwd: Your message to Dbpedia-discussion awaits moderator approval

From: Pat Hayes <phayes@ihmc.us>
Date: Mon, 10 Aug 2009 15:47:22 -0500
Cc: Kingsley Idehen <kidehen@openlinksw.com>, Anja Jentzsch <anja@anjeve.de>, public-lod community <public-lod@w3.org>, Tim Finin <finin@cs.umbc.edu>, dbpedia-discussion@lists.sourceforge.net
Message-Id: <A7E91C10-A87E-4228-9D9F-05A8472FA469@ihmc.us>
To: Kavitha Srinivas <ksrinivs@gmail.com>
This website should be taken down immediately, before it does serious  
harm. It is irresponsible to publish such off-the-wall equivalentClass  
assertions. The presence or absence of hierarchies, or the similarity  
to tags, are completely irrelevant: the semantics of  
owl:equivalentClass are quite unambiguous and are fixed normatively by  
the OWL specs, so these assertions have a definite meaning; and with  
that meaning they are wildly, irresponsibly and dangerously false. Tim  
is treating it lightly, but this is in fact quite a serious matter.  
Please DISABLE public access to this resource until this is fixed.

Pat Hayes


On Aug 10, 2009, at 3:27 PM, Tim Finin wrote:

> Kavitha Srinivas wrote:
>> I understand what you are saying -- but some of this reflects the way
>> types are associated with freebase instances.  The types are more  
>> like
>> 'tags' in the sense that there is no hierarchy, but each instance is
>> annotated with multiple types.  So an artist would in fact be  
>> annotated
>> with person reliably (and probably less consistently with
>> /music/artist).  Similar issues with Uyhurs, murdered children  
>> etc.  The
>> issue is differences in modeling granularity as well.  Perhaps a  
>> better
>> thing to look at are types where the YAGO types map to Wordnet  
>> (this is
>> usually at a coarser level of granularity).
>
> I think you need a different property to express the relation  
> between the
> freebase types and yago classes.  The whole point of grounding OWL  
> in logic is
> to allow people and computers to draw inferences from the OWL  
> statements.  Those
> statements in the dump do assert that anything that is in the set  
> yago:Uyghurs
> is also in the set yago:MurderedChildren and vice versa.
>
> Why not use rdfs:subClassOf to relate a yago class to a freebase  
> type when every
> member of the class is tagged with the type but not everything  
> tagged with the
> type is a member of the class.
>
> skos:narrower is another option, maybe.
>
>

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Received on Monday, 10 August 2009 20:48:15 UTC

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