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Re: [ontolog-forum] owl2 and cycL/cycML

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Cameron Ross <cross@xxxxxxxxxxxx>
Date: Thu, 29 Jul 2010 19:31:24 -0400
Message-id: <1024888855648287541@unknownmsgid>
Wouldn't Common Logic be the "logical" choice if one were to
relinquish decidability?  It's an ISO standard and tools are gradually
starting to appear.    (01)

Cameron.    (02)

Kojeware Corporation    (03)

On Jul 29, 2010, at 5:48 PM, Ian Horrocks <ian.horrocks@xxxxxxxxxxxxxxx> wrote:    (04)

> OWL and CycL are not really comparable, because OWL is based on a fragment of 
>First Order Logic that is known to be decidable, for which provably correct 
>reasoning algorithms are known and for which effective implementations based 
>on said algorithms are available. OWL's expressive power could, of course, be 
>easily (indeed arbitrarily) extended if one were prepared to compromise on 
>some or all of these design constraints. For example, SWRL extends OWL with 
>Horn clauses (AKA rules), but the resulting language is undecidable, and so 
>only incomplete reasoners are available. In fact such reasoners are typically 
>used in a way that is actually incorrect, in that failure to find an 
>entailment is treated as a non-entailment, whereas it should be treated as 
>"don't know".
>
> Regards,
> Ian
>
>
> On 29 Jul 2010, at 20:15, Zhuk, Yefim wrote:
>
>> Ian,
>>
>> Thanks for another great event related to OWL2.
>>
>> What is your opinion on CycL and CycML (see http://cyc.com)?
>>
>> From my point of view, this language is more expressive than OWL and has 
>naturally embedded rules features.
>> I used this language to describe complex objects and rule-based business 
>scenarios.
>> I think, this comes much closer to mimicking real world than OWL can provide 
>today.
>>
>> Do you see this one as gaining bigger acceptance and getting to the level of 
>a standard?
>>
>> Or maybe there are some limitations that I donít see?
>>
>> Thank you,
>>
>> Jeff
>>
>
>
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