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Subject: Re: [babel] tangle creates different filename than it used to
Date: Mon, 01 Mar 2010 12:03:00 +0100
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To: Dan Davison <davison@stats.ox.ac.uk>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>

Dan Davison wrote:
> "Martin G. Skjæveland" <martige@ifi.uio.no> writes:
>> Hi,
>>
>> running tangle with the following values
>>
>>   #+begin_src xml :tangle test.rdf
>>   ...
>>   #+end_src
>>
>> used to create a file called test.rdf. However, after a fresh git pull
>> today this now tangles to the file test.rdf.xml, which is not what I
>> want.
> 
> I understand. I wonder if babel should simply assume that the user has
> entered a file name with the correct extension when :tangle is something
> other than "yes".

I would prefer such a solution. Why? The generic answer is that I would 
like to name my files myself, and, less generally---as we see in this 
case, the extension of a file does not always tell the language used to 
produce the file, e.g., rdf files may be written in xml or in n3, which 
is not xml. I would like to specify different editing modes for the same 
file extension.

>> I think I could add rdf as a language babel would understand but
>> interpret as xml with something like
>>
>>   (add-to-list 'org-babel-tangle-langs '("rdf" "xml" nil t))
> 
> To tell it to use extension .rdf for rdf blocks would be
> 
> (add-to-list 'org-babel-tangle-langs '("rdf" "rdf" nil t))
> 
> and you'll also need
> 
> (org-babel-add-interpreter "rdf")
> 
>> and rewrite the block to
>>
>>   #+begin_src rdf :tangle test
>>   ...
>>   #+end_src
>>
>> , but then it complains that there is no rdf-mode. How can I best
>> solve this?
> 
> To tell org to use sgml-mode for rdf:
> 
> (add-to-list 'org-src-lang-modes '("rdf" . sgml))

Thanks! This works just fine.

Martin