Jürgen Spitzmüller wrote:
> See LyXRC.cpp:
>
>         case RC_LANGUAGE_AUTO_BEGIN:
>                 str = _("Select if a language switching command is needed
> at the beginning of the document.");
>                 break;
>
>         case RC_LANGUAGE_AUTO_END:
>                 str = _("Select if a language switching command is needed
> at the end of the document.");
>                 break;

I somewhat more clear words:

If these check boxes are _not_ selected, a language begin and/or language end 
tag will be inserted right after \begin{document} and right before 
\end{document}, respectively. Only if these tags are defined, of course.

Example: 

a.) check boxes switched on:

%% LyX 1.5.2svn created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\makeatletter
[EMAIL PROTECTED]/home/juergen//}}
\makeatother
\documentclass[ngerman]{article}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}

\makeatletter
\usepackage{babel}
\makeatother

\begin{document}
hallo
\end{document}


b.) check boxes switched off:

%% LyX 1.5.2svn created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\makeatletter
[EMAIL PROTECTED]/home/juergen//}}
\makeatother
\documentclass[ngerman]{article}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}

\makeatletter
\usepackage{babel}
\makeatother

\begin{document}
\selectlanguage{ngerman} %% <-------LOOK HERE.
hallo

\end{document}

Note that the end tag is missing, since it's undefined in prefs.

Jürgen

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