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[protege-owl] Query: Subclasses or Sibling

Thomas Russ tar at ISI.EDU
Tue Apr 3 16:34:51 PDT 2007


On Apr 3, 2007, at 10:23 AM, Timothy Redmond wrote:

>
> On Apr 3, 2007, at 9:03 AM, Thomas Russ wrote:
>
>>
>> On Apr 3, 2007, at 2:59 AM, william fitzgerald wrote:
>>
>>>
>>> Method 2:
>>>
>>> I think dealing with individuals is more a rules engine thing than
>>> a DL
>>> reasoner area.
>>
>> That depends on the particular DL reasoner.
>>
>> Other DL languages and reasoners have had mechanisms that are quite
>> capable of reasoning using combinations of closed world reasoning,
>> limited closed world reasoning, and even cardinality restrictions
>> asserted directly about instances.
>
> This thread has been going on for some time so I may be missing some
> context.  But it seems to me that you are making a link between
> reasoning about individuals and closed world reasoning.  I think that
> these are two entirely different issues.

Correct, they are different issues.  In this particular case, the  
context
was reasoning about "all values from" restrictions for instance  
classification
or recognition.

I do think that closed-world reasoning tends to be more of an issue when
dealing with instances than with concept subsumption, since I don't  
think
there are any class subsumption inferences that require knowing that the
current set of fillers is the complete set.  That seems to me to be more
of an instance-level concern.

Are there examples where closed world would be needed in subsumption
reasoning between class definitions?




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