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Re: datatypes: conversation with Mark Butler, chair of cc/pp

From: Dan Connolly <connolly@w3.org>
Date: 14 Aug 2002 12:58:25 -0500
To: Brian McBride <bwm@hplb.hpl.hp.com>
Cc: RDF Core <w3c-rdfcore-wg@w3.org>, mark_butler@otter.hpl.hp.com
Message-Id: <1029347905.17704.1187.camel@dirk>

On Wed, 2002-08-14 at 12:48, Brian McBride wrote:
> 
> I chatted with Mark Butler yesterday, including some discussion of 
> datatypes in cc/pp.
> 
> One of the ideas that Mark favours is to define an XML Schema for the cc/pp 
> language.  This would enable:
> 
>    o validation of incoming cc/pp profiles to a server
>    o the use of default attributes to insert datatype attributes such as 
> xsi:type="xsd:decimal" automatically, thus providing global implicit 
> datatyping in the parser.

Ouch! that would conflict with a requirement I hold
near and dear, that literals be syntacitcally evident.
i.e. that you can take an RDF/XML document and
tell whether it's true or false in an interpreation
without appeal to a schema or whatever.

Recall:

a test case for "literals must be self-evident"
From: Dan Connolly (connolly@w3.org)
Date: Thu, Nov 29 2001
http://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0644.html

> Whilst not perfect, does this technique go some way towards meeting the 
> need for global implicit datatyping.

It's all well and good to use XML Schemas to check RDF/XML
documents, but to use them to supply default attributes
isn't workable.

> 
> Brian
-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Wednesday, 14 August 2002 13:58:39 EDT

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