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Re: draft response for 43b ZW3b

From: Zhe Wu <alan.wu@oracle.com>
Date: Mon, 02 Mar 2009 14:28:59 -0500
Message-ID: <49AC337B.500@oracle.com>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
CC: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>, public-owl-wg@w3.org

Looks great to me!


Ian Horrocks wrote:
> Looks fine to me (modulo missing link to diffs).
> Ian
> On 24 Feb 2009, at 15:42, Peter F. Patel-Schneider wrote:
>> [Draft Response for LC Comment 43b:] ZW2b
>> Dear Zhe,
>> Thank you for your message
>>   http://lists.w3.org/Archives/Public/public-owl-wg/2009Jan/0083.html
>> on the OWL 2 Web Ontology Language last call drafts.
>> Your message contains multiple sections, affecting more than one
>> document, and will thus generate multiple replies.  This response
>> is for sections 4 and 8 about the datatypes in OWL 2 RL.
>> We have adjusted the datatypes of OWL 2 RL to include those XML Schema
>> datatypes that are derived from xsd:string and xsd:integer, including
>> xsd:positiveInteger.  These were excluded from OWL 2 RL because of a
>> mistaken analogy with OWL 2 EL and OWL 2 QL, namely that intersection of
>> value spaces must be either empty or infinite to maintain the desired
>> properties of the profile.  It turns out that this is not needed in OWL
>> 2 RL to obtain its desired computational properties.  As any OWL 2 RL
>> tool has to process xsd: string and xsd:integer, the added
>> implementation burden to support these datatypes is negligible.
>> The situation with owl:rational and owl:real is different.  The working
>> group has received complaints that implementing
>> these datatypes may require significant effort on top of a rule
>> reasoner.  Therefore owl:rational and owl:real have been removed from
>> OWL 2 RL.  This possibility was mentioned in Feature At Risk #2.
>> The diffs for these changes can be found at
>> .....
>> The working group notes that Oracle has also brought up concerns with
>> the treatment of xsd:float and xsd:double.  These two datatypes are not
>> currently part of OWL 2 RL.   If this situation changes the working
>> group will communicate with you.
>> Please acknowledge receipt of this email to
>> <mailto:public-owl-comments@w3.org> (replying to this email should
>> suffice). In your acknowledgment please let us know whether or not you
>> are satisfied with the working group's response to your comment.
>> Regards,
>> Peter F. Patel-Schneider
>> on behalf of the W3C OWL Working Group
Received on Monday, 2 March 2009 19:29:38 UTC

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