Re: [O] Bugs/features of accumulating property values when used with entries (concretely: in org-contacts)

[Sebastien Vauban]

Hi Christophe, Eric and Thomas,

Eric Schulte wrote:
> Christoph LANGE <address@hidden> writes:
>> 2011-12-26 15:50 Sebastien Vauban:
>>>> Christoph LANGE<address@hidden>  writes:
>>>>> 2. accumulation doesn't work within the same entry; details follow:
>>>>>
>>>>> So when I changed the above contact entry to
>>>>>
>>>>> * Contact Name
>>>>>    :PROPERTIES:
>>>>>    :EMAIL:    address@hidden
>>>>>    :EMAIL+:   address@hidden
>>>>>    :END:
>>>>>
>>>>> I would have expected (org-entry-get (point) "EMAIL" t) to evaluate to, 
>>>>> well,
>>>>>
>>>>> at least "address@hidden address@hidden" (and in some later version of 
>>>>> org-mode
>>>>>
>>>>> maybe to a two-item list, for even easier automated processing).  But I 
>>>>> got
>>>>>
>>>>> the following unexpected results, which indicate that accumulation is not 
>>>>> yet
>>>>>
>>>>> supported in this context (well, if it was ever _intended_…):
>
> See the attached file for an example of working property inheritance.
> [...]
>
> * Contact Name
>    :PROPERTIES:
>    :FOO:    1
>    :FOO+:   2
>    :END:
>
> #+begin_src emacs-lisp
>   (org-entry-get (point) "FOO" 'inherit)
> #+end_src
>
> #+results:
> : 1
>
> While it is not possible to accumulate two properties from within the
> same block, property accumulation does successfully add to the inherited
> values of variables.
>
> I don't know if it should be possible to accumulate properties within
> the same property block.  I would imagine so, in which case the behavior
> should be considered a bug.

I would say so (that it's a bug), as doing it on a file-basis (within the
"same property block") is well supported:

#+PROPERTY: FOO 1
#+PROPERTY: FOO+ 2

* Contact Name

#+begin_src emacs-lisp
  (org-entry-get (point) "FOO" 'inherit)
#+end_src

#+results:
: 1 2

>>> … AFAIK the `+' is only supported at this stage for the `var'
>>> property: you can't take any property and add a `+' to
>
> FALSE, the "var" property is in no way special when it comes to property
> inheritance.  All properties are treated equally.

Sorry for insinuating it otherwise. And thanks for the correction!

Best regards,
  Seb

-- 
Sebastien Vauban