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I've implemented the changes to xsd:dateTimeStamp

From: Boris Motik <boris.motik@comlab.ox.ac.uk>
Date: Sat, 28 Mar 2009 15:15:51 -0000
To: "'W3C OWL Working Group'" <public-owl-wg@w3.org>
Message-ID: <74276F9961E644FAB6F19ACDEDABE152@wolf>

I have just implemented the change to the semantics of xsd:dateTimeStamp. While
doing so, I took the liberty to clean up the datatype section a bit. The main
problem was that the section was written as if it were defining various
datatypes; for example, it said "The facets of xsd:string are such-and-such".
This is clearly wrong: the facets of xsd:string are as defined in the XML Schema
document, and there is nothing we can do to change this. Another problem was
with the tables with the semantics of facets which were superfluous.

To clarify all this, I have explicitly stated now that the sections defines only
owl:real and owl:rational, and that the specification merely reuses the
definitions of various datatypes. Hence, I've removed any attempts to (re)define
XML Schema datatypes and have just added a bunch of examples by means of which
we discuss certain consequences of their definition.

I have also added an example in the section for functional data properties where
we now discuss the difference between equality and identify.

The diff showing the changes in the Syntax document is here:

No other document was changed in relation to this.

Finally, I would just like to point out that we should include xsd:dateTime into
our datatype map now. There is no good technical reason not to do so;
furthermore, most of the ontologies out there use xsd:dateTime rather than
xsd:dateTimeStamp so, according to our current solution, such ontologies are not
OWL 2 ontologies. I hope we can discuss and resolve this at the next teleconf.


Received on Saturday, 28 March 2009 15:17:06 UTC

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