modify frame title in beamer export

["Gürtler, Martin" <martin.guertler@htwk-leipzig.de>]

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Hi,

I'd like to modify the frame title in beamer export based on
properties or priority as this is possible in latex export.

In latex export, one can set the variable
org-latex-format-headline-function to the name of a function that
creates the content of the headline. I was able to use this in
latex export.

As beamer export is derived from latex export I had hoped that 
this
would automatically work for beamer export as well, but this
is not the case, the headlines in beamer export are not modified.

A second question is, whether one could also use properties to
format the headlines. The arguments of the user supplied function
include tags, but not properties. 

Thanks,

Martin

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