Hi,

I need some help here.

I'm using org 8.3.4.

I am exporting subtrees to LaTeX.
So I configure as much as possible per subtree.

First, I can't find where is documented the difference between
:EXPORT_LATEX_HEADER:
and
:EXPORT_LATEX_HEADER+:

Clearly, I need to use the latter form with my configuration (the former
doesn't output anything), but I'd like to know precisely where the behavior
is described.

Second, when I use several lines with
:EXPORT_LATEX_HEADER+:
they  are concatenated into a single line.

This is annoying because:

:PROPERTIES:
:EXPORT_LATEX_HEADER+: \usepackage{mathptmx} % rm & math
:EXPORT_LATEX_HEADER+: \usepackage[scaled=0.90]{helvet} % ss
...
:END:

results in

\usepackage{mathptmx} % rm & math  \usepackage[scaled=0.90]{helvet} % ss

which is obviously unintended.

Could it be possible to add a '\n' between those lines?

Thanks for any help / clarification

Fabrice