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RE: /WD-xpath-datamodel-20030502/

From: Ashok Malhotra <ashokma@microsoft.com>
Date: Wed, 21 May 2003 05:06:13 -0700
Message-ID: <E5B814702B65CB4DA51644580E4853FB085C283B@red-msg-12.redmond.corp.microsoft.com>
To: "Norman Walsh" <Norman.Walsh@Sun.COM>, "Kay, Michael" <Michael.Kay@softwareag.com>
Cc: <David.Pawson@rnib.org.uk>, <public-qt-comments@w3.org>

We need to be careful here...

| We have added statements in the XPath and XSLT specifications saying 
| that the set of types may be extended by implementors, I think the 
| Data Model document probably needs to say something to reflect this.

Users cannot create new primitive datatypes.  All they can do is
restrict the existing 19 XML Schema primitive types. Since the value
space of a restricted type is a subset of the value space of the
primitive type (I'm only discussing atomic types, not lists and unions
here) the value space of atomic types cannot be extended by users.
Users can create new datatypes that cover some subset of this value
space.  

All the best, Ashok
> -----Original Message-----
> From: public-qt-comments-request@w3.org [mailto:public-qt-comments-
> request@w3.org] On Behalf Of Norman Walsh
> Sent: Monday, May 19, 2003 1:41 PM
> To: Kay, Michael
> Cc: David.Pawson@rnib.org.uk; public-qt-comments@w3.org
> Subject: Re: /WD-xpath-datamodel-20030502/
> 
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> / "Kay, Michael" <Michael.Kay@softwareag.com> was heard to say:
> |> From section 5.
> |> quote.
> |> The value space of the atomic values is the union of the
> |> value spaces of the nineteen primitive XML Schema types. unquote.
> |>
> |> Does this imply that no types (or at least atomic types) from
> |> any other source are valid within this data model?
> |>
> |> Is this lockout for anything other than XML schema types or
> |> some direct derivation?
> |>
> |> Or more specifically, lockin to XML schema types?
> |>
> |
> | We have added statements in the XPath and XSLT specifications saying
> that
> | the set of types may be extended by implementors, I think the Data
Model
> | document probably needs to say something to reflect this.
> 
> Yes.
> 
>                                         Be seeing you,
>                                           norm
> 
> - --
> Norman.Walsh@Sun.COM    | Whatever you may be sure of, be sure of
this:
> XML Standards Architect | that you are dreadfully like other
> Web Tech. and Standards | people.--James Russell Lowell
> Sun Microsystems, Inc.  |
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Received on Wednesday, 21 May 2003 08:05:49 GMT

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