I'd like to have either a macro or a property that controls some behavior
of an org-mode babel file:

#+PROPERTY: report_type All

and use that property inline: {{{property(report_type)}}} and in a source
block:

#+NAME: rtype
#+BEGIN_SRC emacs-lisp :results value
{{{property(report_type)}}}
#+END_SRC

And use that source block:

The report type is call_rtype()[:results raw]

But this doesn't work, I get "Symbol's value as variable is void:
{{{property

Is there any way to interpolate macros or properties into a source block
like this? Or is there a better way for me to set org-mode "global
variables" at the top of my file?

-- 
Gary