[O] #+INCLUDE: file in code block results does not work?

[KDr2]

I wrote a piece of code like below:

#+NAME: inc-file

#+BEGIN_SRC elisp :results value raw :exports results :var file="common.inc.org"

  (concat "#+INCLUDE: /path/to/include-dir/" file) ;; path is cal-ed from path of current-buffer file

#+END_SRC

#+CALL: inc-file(file="a.org") :results raw

but this does not work, anyone knows why?

By the way, #+HTML_HEAD in code block results works well:

#+NAME: d-header

#+BEGIN_SRC elisp :results value raw :exports results

  (concat "#+HTML_HEAD: <link rel=\"stylesheet\" type=\"text/css\" href="" "/style.css" "\" />")

#+END_SRC

#+CALL: d-header() :results raw

Thanks.

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KDr2, http://kdr2.com