From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: ox-beamer and CUSTOM_ID
Date: Tue, 13 Oct 2015 21:50:02 +0200
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	(Fabrice Popineau's message of "Tue, 13 Oct 2015 21:38:48 +0200")
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To: Fabrice Popineau <fabrice.popineau@gmail.com>
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Fabrice Popineau <fabrice.popineau@gmail.com> writes:

> 2015-10-13 21:26 GMT+02:00 Nicolas Goaziou <mail@nicolasgoaziou.fr>:
>
>> Hello,
>>
>> I don't understand the issue. BEAMER_REF: #foo generates the same
>> internal reference as :CUSTOM_ID: foo, doesn't it?
>>
>>
> My point is that you need to set :
>
> * Frame 1
> :PROPERTIES:
> :BEAMER_OPT: label=foo
> :END:
>
> * Frame 2
> :PROPERTIES:
> :BEAMER_env: againframe
> :BEAMER_ref: #foo
> :END:

If I try to export this file, I get an error:

  user-error: Unable to resolve link: "foo"

which is to be expected since :CUSTOM_ID: foo doesn't exist.

> because if you use CUSTOM_ID in the first frame, the link is not
> resolved.

It should be. With the following document

  * Frame 1
  :PROPERTIES:
  :CUSTOM_ID: foo
  :END:

  * Frame 2
  :PROPERTIES:
  :BEAMER_env: againframe
  :BEAMER_ref: #foo
  :END:

I get

  \begin{document}

  \begin{frame}[label={sec:orgheadline1}]{Frame 1}
  \end{frame}

  \againframe{{sec:orgheadline1}}
  \end{document}

So, I'm still puzzled.

> The code at stake is :
> ox-beamer:org-beamer-headline which calls ox-beamer:org-beamer--get-label
> at line 624
>
> Clearly, org-beamer--get-label doesn't make use of CUSTOM_ID.

It doesn't need to, since CUSTOM_ID will not be used anyway in the final
output.

Regards,