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RE: draft of LC comment to XML Schema WG

From: Michael Schneider <schneid@fzi.de>
Date: Mon, 4 Aug 2008 15:40:25 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A0AD919B@judith.fzi.de>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: <public-owl-wg@w3.org>
Hi Peter!

Sounds like a pretty clear read to me. A few remarks/questions follow

Peter F. Patel-Schneider wrote:

>Here is my proposed LC comment to the XML Schema WG concerning datetime.


>For the purposes of reasoning in OWL, it is much easier to deal with
>dateTime values where the timezone is present.  Such values can be
>converted to single time points (using timeOnTimeline) 

What is 'timeOnTimeline'? Is this something that XSD people know? 

>and a complete
>order determined from the time points.  We would thus like to have a
>derived XML Schema datatype for dateTime with a required timezone.  [I
>added this last sentence based on some evidence but the WG should

How is the XSD group supposed to understand "derived XML Schema datatype"?
As a datatype different from the original xsd:dateTime?


>This treatment of dateTime values appears to violate the document, as
>different dateTime values that compare equal according to the document
>are turned into dateTime values that do not compare equal. 

I am not clear whether I correctly understand this sentence. Does this refer
to the situation that a non-timezoned dateTime is compared to a dateTime
with a timezone? Because the comparison between two dateTimes without a
timezone should always lead to the same result for both XSD and OWL, or do I
overlook something here?


Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Email: Michael.Schneider@fzi.de
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FZI Forschungszentrum Informatik an der Universität Karlsruhe
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Received on Monday, 4 August 2008 13:41:06 UTC

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