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RDF Data Access, XQuery, rules

From: Dan Connolly <connolly@w3.org>
Date: Mon, 16 Aug 2004 10:19:46 -0500
To: public-swbp-wg@w3.org
Cc: public-rdf-dawg-comments@w3.org
Message-Id: <1092669586.4845.2044.camel@dirk>

Hi Best Practices/Deployment folks,

You might  have seen our recent WD...

RDF Data Access Use Cases and Requirements
W3C Working Draft 2 August 2004

This Version: 
        http://www.w3.org/TR/2004/WD-rdf-dawg-uc-20040802/
Latest Version: 
        http://www.w3.org/TR/rdf-dawg-uc/

This is our 2nd release; in the Status section, note

"the design objectives are in development. The status of each design
objective indicates whether it has been adopted by the WG. The
requirements have all been accepted by the working group."

While the BPDWG is more than welcome to review the whole document,
either individually or as a group, we're particularly interested
in feedback on a couple things:

1. XQuery, syntax and integration: We're chartered to "... maximize
W3C technology re-use, while also taking account of differences
between the RDF graph data model and the XQuery data model" and
to allow "... for RDF data to be accessable within an XML
Query context".
 -- http://www.w3.org/2003/12/swa/dawg-charter#XQueryBinding

We have been discussing an objective regarding making
RDF data available in an XML Query context,
  http://www.w3.org/2001/sw/DataAccess/ftf2#qrdesigns
  http://www.w3.org/2001/sw/DataAccess/ftf2#xqfa
but we don't have a critical mass around any particular objective yet.

We have a "human-friendly syntax" objective
  http://www.w3.org/TR/rdf-dawg-uc/#d4.1
and there has been discussion of whether borrowing from XQuery
syntax helps there.

Anybody have experience with XQuery/RDF integration to share?


2. Rules, Additional Semantic Information

We have an objective

"It should be possible for knowledge encoded in other semantic
languages—for example: RDFS, OWL, and SWRL—to affect the results of
queries executed against RDF graphs."

 -- http://www.w3.org/TR/rdf-dawg-uc/#d4.6

and in discussion of rules and query
  http://www.w3.org/2001/sw/DataAccess/ftf2#qrdesigns

we noted a connection between rules and a CONSTRUCT
mechanism found in various contemporary designs, including
our current draft

http://www.w3.org/2001/sw/DataAccess/rq23/#construct
$Revision: 1.25 $ of $Date: 2004/08/16 12:23:00 $

Any rules/query integration experience to share? Thoughts
on best practices for accessing RDF data, while rules
work is still in the early stages of standardization?



-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Monday, 16 August 2004 15:19:19 GMT

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