** reference to a commented out subtree
   :PROPERTIES:
   :DATE:     2011-02-28
   :END:
*** COMMENT I don't export
    :PROPERTIES:
    :DATE:     2011-02-28
    :END:
#+name: hidden-parameters
| 1 |
| 2 |
| 3 |
| 4 |

*** I do export
    :PROPERTIES:
    :DATE:     2011-02-28
    :END:
#+begin_src emacs-lisp :var params=hidden-parameters :exports both
  params
#+end_src