Dear Uwe, dear all,
I would be very interested to get a working .org file model of preambles , in order to produce in org format articles in latex, as well as in html, as well as in beamer class, it would be splendid.
Unfortunately, I did not succeeded in my several tentatives, and I came back to write directly in latex format, which is certainly not the best solution when you have to make also beamer files from your articles.
It would be nice of you and/or everyone in this list to give here a copy of a working model of preambles in org mode. I know that I I have to read the documentation, and I do, but it would be quicker with help of some experts of this list.
All the best
Jo.