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

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Wed, 18 Mar 2009 15:47:19 -0400 (EDT)
Message-Id: <20090318.154719.32799514.pfps@research.bell-labs.com>
To: alan.wu@oracle.com
Cc: alanzwu@yahoo.com, public-owl-wg@w3.org
Dear Zhe,

This is an addendum to our response to your message
<http://lists.w3.org/Archives/Public/public-owl-wg/2009Jan/0083.html>
on the OWL 2 Web Ontology Language last call drafts.

In our previous response 
<http://lists.w3.org/Archives/Public/public-owl-wg/2009Mar/0047.html>
we stated

  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.

This situation has changed and now xsd:float and xsd:double are part of
OWL 2 RL so we are duly notifying 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 


From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Subject: [LC Response] To Zhe Wu Re: OWL 2 LC Comments
Date: Wed, 04 Mar 2009 16:38:17 -0500 (EST)

> 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 Wednesday, 18 March 2009 19:46:18 GMT

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