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Re: Proposal for ISSUE-12, string literals

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Fri, 13 May 2011 18:40:24 +0100
Message-ID: <4DCD6D08.6040008@epimorphics.com>
To: public-rdf-wg@w3.org


On 13/05/11 16:00, Richard Cyganiak wrote:
> Objection 2: time and dateTime would become always UTC
>
> I'm not sure what to respond here.

They wouldn't necessarily.  It's not that simple :-)

"2011-05-13T18:07:50"^^xsd:dateTime

with no timezone is not in UTC - there's no default.

There are two related timelines that form the value space - one for 
timezoned datetimes and one for un-timezoned ones.

If you compare a timezoned with a non-timezoned dateTime you may get 
"Indeterminate" back if the dateTime, modified by timezone is with 14 
hours of the time of the untimezoned one.

The "Dynamic Context", a feature of XQuery/XPath, not of XSD datatype 
per se, has an implicit timezone - it's set to whatever the 
implementation chooses.

http://www.w3.org/TR/xpath20/#id-xp-evaluation-context-components

That it OK for processing XML but I think that for RDF, data authored in 
one timezone, stored in another, downloaded by something in a third is 
quite possible.

	Andy
Received on Friday, 13 May 2011 17:40:56 GMT

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