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Re: required timezone xsd dateTime datatype (ISSUE-138)

From: Michael Smith <msmith@clarkparsia.com>
Date: Tue, 30 Sep 2008 10:33:10 -0400
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: public-owl-wg@w3.org
Message-Id: <1222785190.6332.27.camel@msmith-laptop-wired.int.clarkparsia.com>

On Tue, 2008-09-30 at 10:14 -0400, Peter F. Patel-Schneider wrote:
> Discussion in the XML Schema WG on 29 September 2008 chronicled at
> http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2008Sep/0025.html
> indicates that they will indeed have a datatype that is xsd:dateTime
> with a required timezone.  They will also have a facet for xsd:dateTime
> that indicates whether the timezone is required, forbidden, or optional.
> 
> The net result is that we can eventually use an xsd name for
> owl:dateTime.  However, I suggest that this does not need to be
> reflected in the current round of publication. 

I believe that there is still an issue of equality vs. identity.  With
the current description in Syntax

2008-09-30T10:27:30-04:00 is the same value as 2008-09-30T14:27:30-00:00

This is not true with xsd:dateTime, so will not be true for a type
derived from it which requires timezones.  See the note just before
3.3.8.2 in [1].
-- 
Mike Smith

Clark & Parsia

[1] http://www.w3.org/TR/xmlschema11-2/#dateTime
Received on Tuesday, 30 September 2008 14:33:56 UTC

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