>
> [btw, I am not entirely sure I know what "header parameters" are ---

see http://orgmode.org/manual/Header-arguments.html

> 
> are these the parameters that come from the #+begin_src line?  If so,
> shouldn't they definitely be read from the #+begin_src line?  They
> can't very well be read from manual.org, which doesn't contain the
> #+begin_src line.]
>

These could appear with the code block, or as a property in an enclosing
heading.

Another example of a case where the original file is needed rather than
the exported file would be the case of exporting a subtree which
includes a block which references a variable defined elsewhere in the
file.

>
> Sorry if I wasn't clear in my original message.
>

No problem, I believe I misread this email thread.

Thanks -- Eric

>
> Best,
> r
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/