From mboxrd@z Thu Jan  1 00:00:00 1970
From: zwz <zhangweize@gmail.com>
Subject: Re: Babel should not work in the subtree marked as not exported
Date: Wed, 12 Mar 2014 19:02:33 +0800
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Rainer M Krug <Rainer@krugs.de> writes:

> Ken Mankoff <mankoff@gmail.com> writes:
>
>> On 2014-03-11 at 08:47, zwz wrote:
>>> In my setup, there is 
>>> (setq org-export-exclude-tags '("private" "exclude")
>>>
>>> and In my test.org:
>>>
>>> * test
>>>
>>> ** Not exported                :exclude:
>>>    #+BEGIN_SRC ditaa :file test.png :cmdline -E
>>>           +--------+---+---+---+---+---+---+---+  +---+---+---+---+---+---+---+---+
>>>       x   | 0 cRED | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 |
>>>           +--------+---+---+---+---+---+---+---+  +---+---+---+---+---+---+---+---+
>>>    #+END_SRC
>>>
>>> ** blah blah
>>>    blah blah blah
>>>
>>>
>>> When I try to export it to pdf, the test.png is still generated,
>>> although it is not used for the pdf at all.
>>> So I think the export procedure may be optimized for more efficiency.
>>
>> No, because I often have code and sections I don't want exported, but
>> I want their side-effects active. For example, code with sessions
>> where part is not exported, but I need that code run so code
>> elsewhere, using the same session, is able to run and be exported.
>
> AFAIK, this depends if you use a session. When you are using a session,
> *all* code blocks are evaluated, if you do not set the header argument
> session, only the ones which are exported are evaluated - precisely the
> reason you give.
>
> Rainer
>
>>
>>   -k.
>>
>>

In my example, I did not set the header argument session, and variable
org-babel-default-header-args has the value:
 (:results . "replace")
 (:exports . "code")
 (:cache . "no")
 (:noweb . "no")
 (:hlines . "no")
 (:tangle . "no"))
However, the block still runs.