Using the XInclude component with a default processing model for GRDDL

This comment is with respect to the XML Pipleline Language's XInclude component [1].  The GRDDL Working Groups resolution [2] to postpone the #faithful-infoset issue in concert with the Technical Architecture Group's ongoing [3] conversation on xmlFunctions-34  is predicated on the XML Processing Model Working  Group meeting its chartered responsibility for defining a default processing model:

[[
In the absence of any guidance, what default processing, if any, should be done in what circumstances?
]] -- http://www.w3.org/2005/10/xml-processing-model-wg-charter.html#xml-scope

This is especially important for situations where uncertainty in an XML Document's infoset can cause ambiguity in the GRDDL results associated with that XML Document.  The GRDDL Working Group has developed two test cases which demonstrate [4] (in the absence, at this time,  of a recommendation document for XProc) the need for more coarse-grained XML processing of XML Documents which make use of “elaborating namespaces” [5] .

In particular, Xinclude components will need to be used after a deterministic, default processing model is applied to form the infoset it takes as input.  Although short of the use of non-validating parsers, ambiguity cannot [6] be completely eliminated from this infoset, ambiguity as a result of the use of elaborating namespaces needs to be addressable via XProc (in conjunction with a default processing model).  The #noxinclude test demonstrates measures that could be taken (but not enforced by GRDDL) to ensure that XProc (along with certain processing dictates) is properly used to ensure a functional mapping to a GRDDL result from an XML Document.

[1] http://www.w3.org/TR/xproc/#c.xinclude
[2] http://www.w3.org/2007/06/06-grddl-wg-minutes.html#item04
[3] http://www.w3.org/2001/tag/2007/06/11-minutes.html#item07
[4] http://www.w3.org/2001/sw/grddl-wg/td/grddl-tests#multiple-infosets
[5] http://www.w3.org/2001/tag/doc/elabInfoset.html#elab_ns
[6] http://lists.w3.org/Archives/Public/public-grddl-wg/2007Jun/0000.html

Chimezie (chee-meh) 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



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