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Re: draft public comment for OWL last call from RIF

From: Jos de Bruijn <debruijn@inf.unibz.it>
Date: Fri, 23 Jan 2009 17:03:25 +0100
Message-ID: <4979EA4D.3060909@inf.unibz.it>
To: Bijan Parsia <bparsia@cs.man.ac.uk>
CC: Chris Welty <cawelty@gmail.com>, Bijan Parsia <bparsia@cs.manchester.ac.uk>, Sandro Hawke <sandro@w3.org>, Dave Reynolds <der@hplb.hpl.hp.com>, "Public-Rif-Wg (E-mail)" <public-rif-wg@w3.org>


Bijan Parsia wrote:
> On 23 Jan 2009, at 15:42, Jos de Bruijn wrote:
> 
>> Bijan Parsia wrote:
>>> On 23 Jan 2009, at 15:28, Jos de Bruijn wrote:
>>>
>>>>> One could make a better case that difference in the *semantics* of
>>>>> same
>>>>> named datatypes should be the same. But even there, OWL does
>>>>> *different
>>>>> things* with the datatypes (i.e., it treats them as constraints).
>>>>
>>>> I don't see a strong case for that. I personally find it ridiculous if
>>>> in OWL
>>>> "1"^^xsd:int owl:sameAs "1"^^xsd:float
>>>> is a tautology, but in RIF
>>>> "1"^^xsd:int = "1"^^xsd:float
>>>> is inconsistent.
>>>
>>> Jos, that is in the subset of the semantics where I think there could or
>>> should be harmonization.
>>
>> good, then we agree here :-)
> 
> (Assuming that = and sameAs are the same :))

Yes, they are both interpreted as identity :)

> 
>>> If you note the example of the "semantic" divergence (which isn't really
>>> a difference in semantics but in the available operators...but
>>> presumably predicates and operators are very user visible aspects of the
>>> semantics), I didn't propose this one :)
>>
>> Sure, the operators are different, because the languages are different
>> in nature.
> 
> Well, that is also a reason for owl to have rationals (and reals in
> general). We intend to support linear (and possibly non-linear)
> inequations (as constraints). If you don't support that, then rationals
> become less compelling and thus might yield to implementation
> considerations.

Fine by me. I don't feel very strongly about the sets of datatypes
diverging, just about their semantics (i.e., the definitions of their
value spaces) :-)

Best, Jos

> 
> Cheers,
> Bijan.
> 

-- 
Jos de Bruijn            debruijn@inf.unibz.it
+390471016224         http://www.debruijn.net/
----------------------------------------------
No one who cannot rejoice in the discovery of
his own mistakes deserves to be called a
scholar.
  - Donald Foster


Received on Friday, 23 January 2009 16:03:46 GMT

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