Thanks Misha.  Let's put it on the list.

Looks like the relevant piece of the doc is http://www.w3.org/TR/2004/WD-xmlschema11-2-20040716/#d-t-values

Eric

> Eric Childress
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-----Original Message-----
From: DCMI Date Working Group [mailto:[log in to unmask]]On Behalf
Of Misha Wolf
Sent: Friday, January 07, 2005 4:09 AM
To: [log in to unmask]
Subject: Re: W3C datatyping URIs Re: DCMI Date WG workplan 2004/2005 --
proposed


To which I would add that a lot of interesting work on dates 
appears to have been done in preparation for XML Schema 1.1.
See:
http://www.w3.org/TR/2004/WD-xmlschema11-2-20040716/#d0e24260

[Warning: This is a Working Draft]

One item worth mentioning is a small change in the handling 
of year 0 and years BCE.  

Misha 


-----Original Message-----
From: DCMI Date Working Group [mailto:[log in to unmask]] On Behalf
Of Charles McCathieNevile
Sent: 07 January 2005 03:36
To: [log in to unmask]
Subject: W3C datatyping URIs Re: DCMI Date WG workplan 2004/2005 --
proposed

For XML Schema Datatypes, see "XML Schema Part 2: Datatypes" at
http://www.w3.org/TR/xmlschema-2

For RDF Datatypes the picture isn't so well explained in the specs.
Basically
you should look at the RDF Syntax spec, especially the bit at
http://www.w3.org/TR/rdf-syntax-grammar/#section-Syntax-datatyped-litera
ls
and at the part of RDF concepts that sort of explains and sort of
confuses
the issue - http://www.w3.org/TR/rdf-concepts/#section-Datatypes and
then try
to work through the complex notation and expression in the model and
theory
specification which gives the formal semantics, and also points to a set
of
useful datatypes for iso 8601 dates (i.e. those already defined in XML
Schema) - this is at http://www.w3.org/TR/rdf-mt/#dtype_interp

There is some simple stuff in the OWL guide at
http://www.w3.org/TR/owl-guide/#Datatypes1 and an example of how to
contruct
a range for a Datatype property at
http://www.w3.org/TR/owl-ref#EnumeratedDatatype (The syntax looks really
scary, but it is actually just verbose - it is pretty easy to generate
it
automatically from any syntactic shortcut you like and then use it with
tools). The stuff in the OWL Abstract syntax and semantics spec is way
over
my head - it defines all this in formal logic, if you're interested in
chasing that up.

cheers

Chaals

On Thu, 6 Jan 2005, Childress,Eric wrote:

>Charles,
>
>        Thanks for the quick comments.  Can you supply URLs to the
appropriate documents?
>>
>>
>-----Original Message-----
>From: Charles McCathieNevile [mailto:[log in to unmask]]
>Sent: Thursday, January 06, 2005 11:00 AM
>To: Childress,Eric
>Cc: [log in to unmask]
>Subject: Re: DCMI Date WG workplan 2004/2005 -- proposed
>
>
>Hi All,
>
>this looks like a good plan to me.
>
>I think that it would be nice to include in this looking at RDF and XML
>schema datatypes for dates, which extend somewhat the possible range
(e.g.
>they do allow for B.C.E dates), but which are also partially related to
usage
>in particular syntax rather than the general schemes.



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