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Re: Representation of Negative Assertions in OWL 1.0

From: Alan Ruttenberg <alanruttenberg@gmail.com>
Date: Sun, 8 Jun 2008 23:02:43 -0400
Message-Id: <E05AAE6B-049B-4C0F-9FD6-632E726C8E4F@gmail.com>
Cc: "Christine Golbreich" <cgolbrei@gmail.com>, "OWL Working Group WG" <public-owl-wg@w3.org>
To: "Kashyap, Vipul" <VKASHYAP1@PARTNERS.ORG>



On Jun 8, 2008, at 6:38 PM, Kashyap, Vipul wrote:

>
> I think the Demorgan Law was not applied properly.
> I think what Christine probably had in mind was the following  
> expression;
>
> Individual(Sarkozy type(ObjectComplementOf(ObjectSomeValuesFrom 
> (isPresidentOf
> ObjectOneOf(USA)))))

I've added this expression to http://purl.org/science/owl2/examples/ 
president.owl
You can see it is equivalent to the two earlier ones.

>
> ---Vipul
>
>> -----Original Message-----
>> From: Alan Ruttenberg [mailto:alanruttenberg@gmail.com]
>> Sent: Sunday, June 08, 2008 6:18 PM
>> To: Kashyap, Vipul
>> Cc: Christine Golbreich; OWL Working Group WG
>> Subject: Re: Representation of Negative Assertions in OWL 1.0
>>
>>
>> On Jun 8, 2008, at 3:35 PM, Kashyap, Vipul wrote:
>>
>>>
>>>
>>>>> Individual(Sarkozy type(Restriction(isPresidentOf allValuesFrom
>>>>> (complementOf(oneOf(USA))))))
>>>>
>>>> what about:
>>>>
>>>> Individual(Sarkozy
>>>> type(ObjectComplementOf(ObjectAllValuesFrom(isPresidentOf
>>>> ObjectOneOf(USA))))) ???
>>
>> It may be intuitive, but I don't believe it captures what you want.
>> It says that Sarkozy can't only be the the president of the USA.
>> However he could be president of both the USA and France.
>>
>> I've put these examples in an OWL file. If you classify it you will
>> see that the previous two expressions (from earlier emails) are
>> determined to be equivalent, and that there is no inconsistency in
>> making Sarkozy a president of both USA and France, as I have done in
>> the example.
>>
>> http://purl.org/science/owl2/examples/president.owl
>>
>> Best,
>> Alan
>>
>>>
>>> IMHO, the above representation is more intuitive than the
>>> representations
>>> proposed by Alan and I and corresponds, in my mind, to the "closest"
>>> representation to the negative assertion 'Sarkozy is not the
>>> President of the
>>> USA"
>>>
>>> Of course all these are logically equivalent representations, but
>>> they have
>>> different connotations to the non-logically oriented subject matter
>>> expert/ontology engineer.
>>>
>>> This is precisely, why the syntactic sugar is a very good value add.
>>>
>>> ---Vipul
>>>
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>>
Received on Monday, 9 June 2008 03:03:23 GMT

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