W3C home > Mailing lists > Public > public-grddl-wg@w3.org > August 2007

Re: Comments on GRDDL (using 3rd-party XML schemas with GRDDL) [OK?]

From: Chimezie Ogbuji <ogbujic@ccf.org>
Date: Wed, 01 Aug 2007 09:42:16 -0400
To: "GRDDL Working Group" <public-grddl-wg@w3.org>
Message-ID: <1185975736.31211.26.camel@otherland>

On Fri, 2007-07-27 at 09:46 -0500, Dan Connolly wrote:
> It's inconsistent.

Yes

> Any statement of the form "A GRDDL-aware agent may ..." specifies
> conforming behavior. To then say that such behavior is not conforming
> is inconsistent.

Yes, see my previous email about the value of additional text regarding
capabilities not required by a GRDDL-aware agent.  

> Rather than "allowing
> transformations to be found in schemas not specified at 
> the namespace document" it would make more sense to say
> "allowing namespace documents to be looked up using
> non-standard mechanism"; e.g. somebody could use
> a local/custom URN resolver or a catalog or whatever to
> overlay the public web with a local mapping of URIs
> to schemas. 

This makes *much* more sense IMHO.  The mechanism is not out-of-band,
(it is very much within the boundaries of AWWW - albeit via a
non-ubiquitous URI scheme), it doesn't speak specifically about schemas
(of which GRDDL knows *nothing* and should remain this way).  I would
strike out the last statement about schemas.  

I think we can satisfy the XQuery WG's concerns with statements which
demonstrate that HTTP dereference of a namespace URI is not the *only*
way to resolve additional content to consider in calculating a derived
RDF graph (even though this is the only normative mechanism which
results in a 'faithful rendition') without saying anything about XML
schemas.  

This is very similar to something I touched on in a recent presentation
[1] where I investigated how GRDDL can be extended to support "faithful
renditions" via transformations identified by mechanism in a CMS
independent of direct markup in the source.  

The suggested solution was to use "GRDDL-like" mechanisms where the
application of a transformation is the same as in GRDDL, but the means
by which the transformation is identified is outside of GRDDL.  This
does not require a modification to GRDDL but an understanding of how it
can be used as the base framework for additional (in this case, more
specific) behavior.

I think the comment thread is conflating identification of schema
documents with calculation of faithful renditions (the two have
*nothing* to do with each other).

> Then the result is a faithful rendition
> inasmuch as the author of the source document agrees
> that the non-standard lookup mechanism gives a
> reasonable representation of the namespace document.

I'm not certain it would be a 'faithful rendition' as it the resulting
RDF would have been computed through transformations identified in a
manner outside of GRDDL.  However, this doesn't mean that GRDDL-like
computation of RDF graphs are not useful or cannot be done.

[1] http://copia.ogbuji.net/files/stc07/GRDDL-XML-CMS.odp

-- 
Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
ogbujic@ccf.org


===================================

Cleveland Clinic is ranked one of the top hospitals
in America by U.S. News & World Report (2007).  
Visit us online at http://www.clevelandclinic.org for
a complete listing of our services, staff and
locations.


Confidentiality Note:  This message is intended for use
only by the individual or entity to which it is addressed
and may contain information that is privileged,
confidential, and exempt from disclosure under applicable
law.  If the reader of this message is not the intended
recipient or the employee or agent responsible for
delivering the message to the intended recipient, you are
hereby notified that any dissemination, distribution or
copying of this communication is strictly prohibited.  If
you have received this communication in error,  please
contact the sender immediately and destroy the material in
its entirety, whether electronic or hard copy.  Thank you.
Received on Wednesday, 1 August 2007 13:45:46 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 8 January 2008 14:11:50 GMT