From mboxrd@z Thu Jan  1 00:00:00 1970
From: Aaron Ecay <aaronecay@gmail.com>
Subject: Re: Difference :header-args: and :header-args+:?
Date: Thu, 04 Sep 2014 12:36:46 -0400
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To: Rainer M Krug <Rainer@krugs.de>, emacs-orgmode@gnu.org

Hi Rainer,

2014ko irailak 4an, Rainer M Krug-ek idatzi zuen:
> 
> Hi
> 
> I have a question concerning the property :header-args:. In addition
> to :header-args: there is also :header-args+:.
> 
> 
> 1) If I set some properties globally and in a subtree I want to *add* a
> *new* header argument - do I have to use the + or not?
> 
> 2) If I set some properties globally and in a subtree I want to *change*
> a *single* header argument which *was set globally* - do I have to use
> the + or not?

Are you aware that you can set individual header args as properties?
Something like (at the file level):

#+property: session *foo*

or (at the subtree level):

:PROPERTIES:
:session: *foo*
:END:

This will likely be easier than trying to do surgery on the header-args
property.

-- 
Aaron Ecay