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Re: Comments on GRDDL

From: Chimezie Ogbuji <ogbujic@ccf.org>
Date: Wed, 02 May 2007 17:30:24 -0400
To: "Andrew Eisenberg" <andrew.eisenberg@us.ibm.com>
cc: public-grddl-comments@w3.org, w3c-xsl-query@w3.org
Message-ID: <1178141424.29639.47.camel@otherland>

On Wed, 2007-05-02 at 11:42 -0400, Andrew Eisenberg wrote:
> The failure of a transformation could be interpreted by a processor as
> producing no RDF data (fail silently) or the error could be passed
> back to the invoker. 

Since (as Dan mentioned) GRDDL results are defined declaratively, error
scenarios don't need to be covered exhaustively: you are a GRDDL-aware
agent *only* if you compute GRDDL results:

A GRDDL-aware agent is a software module that computes GRDDL results of
information resources.
]] - http://www.w3.org/2004/01/rdxh/spec#sec_agt

Regardless of how the failure is interpreted it amounts to the same
thing.  If the failure is interpreted as producing no RDF data (a
graceful failure ala try/catch-do-nothing), there is no GRDDL result:

.. and TP applied to R gives an RDF Graph[RDFC04] G, then G is a GRDDL
result of IR ..
]] - http://www.w3.org/2004/01/rdxh/spec#rule_result

If the failure is caught and passed on to the invoker, it is still the
case that a GRDDL result is never computed.  So, the implementations
only explicit responsibility is to follow the mechanisms outlined only
if the conditions match.  In this case, if indeed the transformation
computes a GRDDL result, there is more you need to do.  Otherwise, do
what is prudent for the agent.

> On producing non-RDF elements, let me extend your analogy and say that
> a processor returns both 11 and "volunteer". The extraneous value
> could be silently ignored, or the entire answer could be considered
> meaningless and the invoker informed of the error. 
> We are suggesting that both cases be acknowledged in the
> specification, and that you specify the behavior allowed by a GRDDL
> processor. 

I hope the text above clarifies the binary nature of the output of a
GRDDL transform: either it produces RDF or it doesn't.  

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


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Received on Thursday, 3 May 2007 00:28:19 UTC

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