%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
%% 
%%  Beispiel 10-07-26 auf Seite 515.
%% 
%%  Copyright (C) 2016 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==xindy -C utf8 -L general -I latex -M myModuleC== 
% Show page(s) 1
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{169.16928pt}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\setlength\parindent{0pt}
\usepackage{filecontents,multicol}
\begin{filecontents*}{myModuleC.xdy}
(define-attributes ("default"))
(define-location-class "page-numbers" ("arabic-numbers"))
(markup-index :open  "~n\begin{theindex}~n"
              :close "~n\end{theindex}~n"
              :tree)
(markup-locclass-list :open "\quad{}")
(markup-locref-list   :sep ", ")
(markup-indexentry :open "~n  \item "           :depth 0)
( define-letter-group "A--D" :prefixes ("A" "B" "C" "D") )
( define-letter-group "E--G" :after "A--D" :prefixes ("E" "F" "G") )
( define-letter-group "H--K" :after "E--G" :prefixes ("H" "I" "J" "K") )
( define-letter-group "L--N" :after "H--K" :prefixes ("L" "M" "N" ) )
( define-letter-group "O--R" :after "L--N" :prefixes ("O" "P" "Q" "R") )
( define-letter-group "S--V" :after "O--R" :prefixes ("S" "T" "U" "V") )
( define-letter-group "W--Z" :after "S--V" :prefixes ("W" "X" "Y" "Z") )
(markup-letter-group-list :sep "~n\indexspace")
\end{filecontents*}
\makeatletter
\renewenvironment{theindex}
  {\raggedright\small\let\item\@idxitem \parskip .0pt\@plus .3\p@\relax
   \begin{multicols}{2}}
  {\end{multicols}}
\makeatother
%StartShownPreambleCommands
\usepackage{makeidx}\makeindex
% xindy -C utf8 -I latex -M myModuleD datei.idx
%StopShownPreambleCommands
\begin{document}
\printindex     \newpage  foo
\index{Aal}   \index{Berg}\index{Cäsar}
\index{Donau} \index{Emil}\index{Flora}
\index{Garten}\index{Ober}\index{Zucker}
\index{Österreich}\index{klein}\index{groß}
\end{document}