It looks like that is probably not possible.  By your description,
everything after \\pagestyle{myheadings}\\markboth{Author}{Title of the
paper} belongs in the document, and this variable is for setting the header.

 \\LaLPonline{??} \\setcounter{page}{1} \\thispagestyle{LLPrrobezissn}
\\label{p} should probably go in your org file as the first line.

John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu


On Mon, Jun 11, 2018 at 5:42 AM, Joseph Vidal-Rosset <
joseph.vidal.rosset@gmail.com> wrote:

> Hello,
>
> Here  is my  problem: for  a specific  latex class  (xxllp.cls), I  have
> difficulties  to get  the \begin{document}  at the  right place  in this
> add-to-list:
>
> (add-to-list 'org-latex-classes
>              '("xxllp"
>                "\\documentclass\[oumk,xs]\{xxllp\}
>  [NO-DEFAULT-PACKAGES]
>  [NO-PACKAGES]
> \\usepackage{amsmath}
> \\usepackage{amssymb}
> \\usepackage{blabla}
> \\usepackage{blablabla}
> \\pagestyle{myheadings}\\markboth{Author}{Title of the paper}
>                \\LaLPonline{??} \\setcounter{page}{1}
> \\thispagestyle{LLPrrobezissn} \\label{p}
> \\AuthorTitle{Joseph Vidal-Rosset}{\\uppercase{Title of the paper}}"
>                ("\\section\{%s\} . \\section*\{%s\}")
>                ("\\subsection\{%s\} . \\subsection*\{%s\}")
>                ))
>
>
> For this class, the \begin{document} should be just after
> \\pagestyle{myheadings}\\markboth{Author}{Title of the paper}
> and just before
>  \\LaLPonline{??} \\setcounter{page}{1} \\thispagestyle{LLPrrobezissn}
> \\label{p}
>
> but because I do not understand  clearly the syntax of the function, I
> do not succeed and the export does not work correctly.
>
> Any suggestion?
>
> --
> Joseph
>
>