I'm _still_ confused about 3.8 Extension elements

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Further to the whole question of versioning. . .

3.8 [1] appears to me to contradict itself:

 "An element is only an extension element if it is an ignorable
  element that occurs as a direct child of a p:pipeline or
  p:pipeline-library."

 "[E]lements in a subpipeline are interpreted as follows. . .
   2. Is in ignorable namespace?
    a. Is a known extension? Process as appropriate."

How can an element in a sub-pipeline be a direct child of p:pipeline?

I know I originally proposed the interpretation bullets, but I'm still
confused. . .

Looking at the RNG schema, and other parts of the spec., I _think_ the
editor's intent was to allow extensions only in subpipelines, as a way
of allowing for . . . extensions.  But that is completely at odds with
the following from the beginning of 3.8:

 "The presence of an extension element must not cause the connections
  between steps to differ from the connections that any other
  conformant XProc processor would produce."

Such a constraint would render any extension useless, as far as I can
tell.

Maybe this all is moot, as this aspect of the spec. has to be
revisited in light of our proposal wrt language evolution at the
f2f [2], discussion wrt Comment 15.  [Actually, I've excerpted
that discussion and replied to the Comment 15 thread with it,
and then sent _this_ message in the resulting thread . . .]

ht

[1] http://www.w3.org/XML/XProc/docs/langspec.html#extension-elements
[2] http://lists.w3.org/Archives/Public/public-xml-processing-model-wg/2007Nov/0031.html
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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Received on Thursday, 22 November 2007 18:17:25 UTC