2016-03-03 12:26 GMT+01:00 Nicolas Goaziou <mail@nicolasgoaziou.fr>:

> Hello,
>
>
Hi Nicolas,


> Fabrice Popineau <fabrice.popineau@gmail.com> writes:
>
> > First, I can't find where is documented the difference between
> > :EXPORT_LATEX_HEADER:
> > and
> > :EXPORT_LATEX_HEADER+:
>
> See (info "(org) Property syntax").
>
>
I need to learn to read better because I didn't see that this paragraph was
about it:

If you want to add to the value of an existing property, append a + to the
property name.
The following results in the property var having the value “foo=1 bar=2”.
#+PROPERTY: var foo=1
#+PROPERTY: var+ bar=2



> Second, when I use several lines with
> > :EXPORT_LATEX_HEADER+:
> > they  are concatenated into a single line.
>
> Correct.
>
> > 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?
>
> Not quite what you are asking for, but couldn't you simply not comment
> each line?
>
> Yes, I can remove the comments, however, from time to time, it may be
useful to be able to comment
some \usepackage line, and I don't see how it can be done in Org, except by
killing the whole line.

In org reference, 12.7.2, it is said that:

‘LATEX_HEADER’
Arbitrary lines added to the preamble of the document, before the ‘hyperref’
settings. The location can be controlled via org-latex-classes.

Note the plural to lines. How can several lines be specified? AFAICS, if I
do :

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

The second line will take precedence over the first one.

Thanks for your help,

Fabrice