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RE: What about sub property chains for datatype properties? (ISSUE-8)

From: Michael Schneider <schneid@fzi.de>
Date: Mon, 5 Nov 2007 21:29:44 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A04A8F91@judith.fzi.de>
To: "Uli Sattler" <sattler@cs.man.ac.uk>
Cc: "Owl Dev" <public-owl-dev@w3.org>

(Ah, finally an answer, after 5 weeks of waiting. :))

Hi, Uli!

>-----Original Message-----
>From: Uli Sattler [mailto:sattler@cs.man.ac.uk] 
>Sent: Monday, November 05, 2007 4:13 PM
>To: Michael Schneider
>Cc: Owl Dev
>Subject: Re: What about sub property chains for datatype 
>properties? (ISSUE-8)
>
>Hi Michael,
>
>there are reasons why these sub-property chains are only made up of  
>object properties:  decidability in OWL (DL and 1.1) relies on the  
>fact that "datatype consistency" can be checked for each object  
>separately, without referring to other objects and the values of  
>their datatype properties. If we would need to do this, we would more  
>likely be in trouble, and would need to
>
>- be much more careful about what datatypes and datatype predicates  
>to allow without loosing decidability and
>- use more complex reasoning mechanisms that have, to the best of my  
>knowledge, only been described on paper and never been implemented or  
>tested.
>
>So, I can see your use case, but I don't think we know enough about  
>this yet.

Ok! Good to hear that there is at least some ongoing research on this topic.


So then I leave it to you to close this issue (I can't anyway :)), or
perhaps better mark it as "postponed", so the next WG (working on OWL-1.2 or
whatever) will have an opportunity to look at this issue in a few years
again. 

>If you want to know more, check out
>
>Carsten Lutz and Maja Milicic. A Tableau Algorithm for Description  
>Logics with Concrete Domains and General TBoxes. Journal of Automated  
>Reasoning. To appear.
>http://lat.inf.tu-dresden.de/~clu/papers/archive/jar06.pdf
>
>Carsten Lutz. Description Logics with Concrete Domains - A Survey. In  
>Philippe Balbiani, Nobu-Yuki Suzuki, Frank Wolter, and Michael  
>Zakharyaschev, editors, Advances in Modal Logics Volume 4. King's  
>College Publications, 2003.
>http://lat.inf.tu-dresden.de/~clu/papers/archive/aiml4.ps.gz

Thanks for this!

>
>Cheers, Uli

Cheers,
Michael

>On 2 Oct 2007, at 13:26, Michael Schneider wrote:
>
>>
>> Hi!
>>
>> It just stroke me that there seem to be only Sub/Object/ 
>> PropertyChains in
>> the current OWL-1.1 draft [1]. Does anyone know if there is a  
>> problem with
>> also having sub property chains of the form
>>
>>   SubDataPropertyOf(
>>       SubDataPropertyChain(R1 ... Rn-1 Dn)
>>       D )
>>
>> where Dn and D are DataPropertyS (having compatible 
>datatypes as their
>> ranges), while R1 ... Rn-1 are ObjectPropertyS?
>>
>> With such a SubDataPropertyChain, one could for instance translate  
>> rules
>> like:
>>
>>   ?x hasFather ?y AND ?y hasFamilyName ?fn
>>   ==> ?x hasFamilyName ?fn
>>
>> with ?fn being an xsd:string, into an equivalent OWL axiom
>>
>>   SubDataPropertyOf(
>>       SubDataPropertyChain(hasFather hasFamilyName)
>>       hasFamilyName )
>>
>> In this case, the super property whould equal the final chain  
>> property (both
>> 'hasFamilyName').
>>
>> An example for a more general rule type (the analogon of the  
>> 'uncle' rule)
>> would be:
>>
>>   ?g containsUser ?u AND ?u hasUserID ?i
>>   ==> ?g containsUserWithID ?i
>>
>> where ?g would stand for some user group. Here, the DataPropertyS
>> 'hasUserID' and 'containsUserWithID' differ from each other,  
>> because they
>> are intended to have a different meaning.
>>
>> Any ideas, if this feature has a chance to enter the family of  
>> OWL-1.1 (or
>> 1.2 :)) axioms? Or did I overlook some fundamental issue here?
>>
>> Cheers,
>> Michael
>>
>> [1] OWL-1.1 Semantics
>>     http://www.webont.org/owl/1.1/semantics.html#2
>>

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: Michael.Schneider@fzi.de
Web  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555

FZI Forschungszentrum Informatik an der Universität Karlsruhe
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Received on Monday, 5 November 2007 20:30:08 GMT

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