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RE: Inferring Properties based on Types

From: Michael Schneider <schneid@fzi.de>
Date: Mon, 1 Oct 2007 18:16:12 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A040A504@judith.fzi.de>
To: "Dmitry Tsarkov" <dmitry.tsarkov@gmail.com>, "Evren Sirin" <evren@clarkparsia.com>
Cc: "Ian Horrocks" <horrocks@cs.man.ac.uk>, "Swanson, Tim" <tim.swanson@semanticarts.com>, "Owl Dev" <public-owl-dev@w3.org>

Hi, Evren and Dmitry!

@Dmitry: Yes, what you say below was also the first thing which came to my
mind, when I read Evren's answer. Of course, I wanted to express that the
property 'manman' is somehow "equivalent" to a given, *arbitrary* class
'Man'. The axiom set should of course not only allow models in which 'Man'
is an equivalent class of 'owl:Thing'. :)

But, Evren, many thanks for your reply! Great discussion, great points! I
was completely unaware of this "Nonstructural Restrictions" issue, and I
will look at it, as soon as I find time.

Hm, and perhaps, we will find another posibility? Or can it be shown that it
is impossible?

Let's hope and see...


>-----Original Message-----
>From: Dmitry Tsarkov [mailto:dmitry.tsarkov@gmail.com] 
>Sent: Monday, October 01, 2007 5:08 PM
>To: Evren Sirin
>Cc: Michael Schneider; Ian Horrocks; Swanson, Tim; Owl Dev
>Subject: Re: Inferring Properties based on Types
>[reply to the list this time]
>On 10/1/07, Evren Sirin < evren@clarkparsia.com 
><mailto:evren@clarkparsia.com> > wrote:
>	With these modifications we get the
>	following set of axioms to express the above rule in OWL 1.1:
>	    (R4) SubObjectPropertyOf( 
>SubObjectPropertyChain(sibling manman) brother)
>	    (A1') ReflexiveObjectProperty( manman ) 
>	    (A3) ObjectPropertyDomain( manman Man )
>	    (A4) FunctionalObjectProperty( manman )
>	One could possibly define a macro that would translate 
>a user-friendly
>	syntax into this set of axioms (and would generate the 
>a unique property
>	like manman for different uses).
>I think this wouldn't work as expected. To be more precise, it 
>would silently introduce additional restrictions to the model. 
>As the semantics of the construction 
>          ReflexiveObjectProperty( manman )
>is the following GCI 
>          SubClassOf ( owl:Thing ObjectExistsSelf(manman) )
>and we have a domain of the property manman, than the (implicit) axiom 
>          SubClassOf (owl:Thing, Man)
>would be added to the ontology. The same would happen for 
>every other reflexive property with either range or domain 
>defined. So, every concept in the ontology would be a Man (in 
>addition to all other supertypes). 

Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
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Email: Michael.Schneider@fzi.de
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FZI Forschungszentrum Informatik an der Universität Karlsruhe
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Received on Monday, 1 October 2007 16:16:31 UTC

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