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Re: Restricted Metadata Inheritance by Named Graphs?

From: Rinke Hoekstra <hoekstra@few.vu.nl>
Date: Thu, 3 Dec 2009 11:52:41 +0100
Cc: Christoph LANGE <ch.lange@jacobs-university.de>, Semantic Web <semantic-web@w3.org>
Message-Id: <AF9B4DF6-1947-4545-8CB8-3DB43CB95905@few.vu.nl>
To: Steffen Staab <staab@uni-koblenz.de>
Hi Christoph,

If you're not particularly concerned with staying in OWL 2 DL, you can define a property chain that will allow you to infer the proper annotations.

Your rule below, can be defined as:

:fooProp owl:propertyChainAxiom (:inheritsMetadata :fooProp) .

This property chain is certainly not as generic as the rule because one such chain needs to be defined for each annotation property in your knowledge base (that's why I renamed ?property to :fooProp).

Why is this not OWL 2 DL? Because property chains cannot range over annotation properties, and they are not allowed to contain cycles (which is clearly the case here).


>> This would, however, easily cause trouble in an RDF world, as
>> 1. the two resources might be of different types, which might be disjoint in
>>   an OWL ontology, but what if ?resource inherits rdf:type from
>>   ?otherResource ?

The property chain defined above will not range over the rdf:type property (as your rule does)

>> 2. what if an inherited property is an OWL FunctionalProperty but has
>>   different values on ?resource and ?otherResource ?

Then a reasoner will infer owl:sameAs relations between the 'metadata'.

>> 3. what if the metadata explicitly stated in the scope (e.g. the same XML
>>   document) of ?otherResource are fine, but somebody else externally writes a
>>   triple ?otherResource :evilProperty "value" ?

Then you get to the issues pointed at by Steffen.

Cheers,

Rinke




---
Dr Rinke Hoekstra

AI Department         |   Leibniz Center for Law    
Faculty of Sciences   |   Faculty of Law            
Vrije Universiteit    |   Universiteit van Amsterdam
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1081 HV Amsterdam     |   1012 CX  Amsterdam        
+31-(0)20-5987752     |   +31-(0)20-5253497         
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Homepage: http://www.few.vu.nl/~hoekstra
Received on Thursday, 3 December 2009 10:53:12 GMT

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