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Re: RDF Graph questions

From: Frank Manola <fmanola@mitre.org>
Date: Fri, 24 May 2002 08:07:20 -0400
Message-ID: <3CEE2CF8.5050907@mitre.org>
To: Brian McBride <bwm@hplb.hpl.hp.com>
CC: Dave Beckett <dave.beckett@bristol.ac.uk>, Jeremy Carroll <jjc@hplb.hpl.hp.com>, w3c-rdfcore-wg <w3c-rdfcore-wg@w3.org>
Brian--

This business about property names being associated with schemas is 
something I've brought up before (specifically, some time ago with Pat, 
since I didn't see anything about it in the Model Theory at the time). 
I know the M&S talks about it, but where, in any of our current 
documents, do we say this?  It seems to me that our current "position" 
is that we're fairly agnostic about where these names come from.  If 
we're going to bind these names to a schema, we're making a much tighter 
connection between schema and instance information than we currently do. 
  It would be helpful to resolve this explicitly though, since I'd like 
to say something about this in the Primer.

--Frank

Brian McBride wrote:

> At 11:04 24/05/2002 +0100, Dave Beckett wrote:
> [...]
> 
>> > 2. Can any URI ref be a property name or must there be some associated
>> > namespace?
>>
>> Any URI ref.  This is pretty clear from M&S ...
> 
> 
> (XML) Namespaces are artifacts of the RDF/XML serialization and are
> not in the current model.
> 
>  From M&S:
> 
> [[
> RDF also requires the XML namespace facility to precisely associate each 
> property with the schema that defines the property; ...
> ]]
> 
> [[
> Property names must be associated with a schema. This can be done by 
> qualifying the element names with a namespace prefix to unambiguously 
> connect the property definition with the corresponding RDF schema or by 
> declaring a default namespace as specified in [NAMESPACES].
> ]]
> 
> [[
> In RDF, each predicate used in a statement must be identified with 
> exactly one namespace, or schema.
> ]]
> 
> Brian
> 


-- 
Frank Manola                   The MITRE Corporation
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mailto:fmanola@mitre.org       voice: 781-271-8147   FAX: 781-271-875
Received on Friday, 24 May 2002 07:59:43 EDT

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