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[protege-owl] re asoner doesn't react to intersection

bassiee back_to_basic_69 at
Tue May 6 10:18:56 PDT 2008

So due the open world reasoning the reasoner doesn't see this ass a problem,
but in my ontologie there should be at least one.
Must I change the rule, or is it correct?
thx seba

Thomas Russ wrote:
> On May 6, 2008, at 6:54 AM, bassiee wrote:
>> hey,
>> i have implemented following OWL-DL rule for a class called 'classA':
>> (∃ has_b B) ⊔ (∃ has_c C)
>> When I make on object of classA, and I don't't create any resources.
>> Then the reasoner doesn't react to it... The reasoner should notise  
>> that at
>> least one of bouth  shouls have a resource.
>> I used pellet and racer pro.
>> Is this normal?
> Yes.  OWL uses open-world reasoning, so it supports having  
> restrictions where the fillers are not known to the OWL reasoner.
> OWL knows that there is some filler, it just doesn't know what it is  
> (nor, given the disjunction, which property or type the filler is  
> associated with.
> Restrictions in OWL are inferences, not type checks.  That is a subtle  
> but important distinction.
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