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Re: [LC Response] To Zhe Wu Re: OWL 2 LC Comments

From: Zhe Wu <alan.wu@oracle.com>
Date: Thu, 19 Mar 2009 17:29:52 -0400
Message-ID: <49C2B950.6000107@oracle.com>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
CC: public-owl-wg@w3.org
Dear Peter,

Just want to let you know that Oracle is happy with your response.



Zhe Wu wrote:
> Dear Peter,
> Thanks for the response. I will pass it on and let the WG know if 
> Oracle is happy with this response.
> Zhe
> Peter F. Patel-Schneider wrote:
>> 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, plus xsd:boolean.  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
>> <http://www.w3.org/2007/OWL/wiki/index.php?title=Profiles&diff=18687&oldid=18109> 
>> 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-wg@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 Thursday, 19 March 2009 21:31:37 UTC

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