** call lines
   :PROPERTIES:
   :DATE:     2011-01-11
   :END:
#+name: doubler
#+begin_src emacs-lisp :var n=2
  (* n 2)
#+end_src

#+call: doubler(n=3)

#+name: doubler(n=3)
: 6

#+call: doubler[:var n=3]()

#+name: doubler[:var n=3]()
: 6