#+property: var  foo=1
#+property: var+ bar=2

#+begin_src emacs-lisp
  (+ foo bar)
#+end_src

#+begin_src emacs-lisp
  (org-entry-get (point) "var" t)
#+end_src

* overwriting a file-wide property
  :PROPERTIES:
  :var:      foo=7
  :END:

#+begin_src emacs-lisp
  foo
#+end_src

#+begin_src emacs-lisp
  (org-entry-get (point) "var" t)
#+end_src
* appending to a file-wide property
  :PROPERTIES:
  :var+:      baz=3
  :END:

#+begin_src emacs-lisp
  (+ foo bar baz)
#+end_src

#+begin_src emacs-lisp
  (org-entry-get (point) "var" t)
#+end_src
* hierarchy test
:PROPERTIES:
:var+: boo=2.5
:END:
** appending to a parent property
  :PROPERTIES:
  :var+:      baz=3
  :END:

The result should be 8.5
#+begin_src emacs-lisp
  (+ foo bar boo baz)
#+end_src

The result should be "foo=1 bar=2 boo=2.5 baz=3"
#+begin_src emacs-lisp
  (org-entry-get (point) "var" t)
#+end_src
** resetting a parent property
  :PROPERTIES:
  :var+:       nil
  :END:
The result should be "nil"
#+begin_src emacs-lisp
  (org-entry-get (point) "var" t t)
#+end_src
*** setting a new property value
:PROPERTIES:
:var+: bat=4
:END:
The result should be "bat=4"
#+begin_src emacs-lisp
  (org-entry-get (point) "var" t)
#+end_src