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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  
+%%  1. Auflage
+%% 
+%%  Beispiel 04-04-11 auf Seite 95.
+%% 
+%%  Copyright (C) 2013 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.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+%% 
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{luacode,libertine}
+\begin{luacode}
+function checknode(List)
+  for t in node.traverse(List) do
+    if t.id==0 or t.id==1 then checknode(t.head) end
+    if t.id==37 then
+--      tex.print(unicode.utf8.char(t.char))
+      if (t.char>96 and t.char<122) or
+         t.char==228 or t.char==246 or t.char==252 then t.char=t.char-32 end
+    end
+  end
+return true
+end
+\end{luacode}
+\def\MUC#1{\setbox0=\hbox{#1}\directlua{checknode(tex.box[0].head)}\box0}
+%StopShownPreambleCommands
+\begin{document}
+\MUC{Freie Universität Berlin}
+\def\TU{Technische Universität Berlin}\MUC{\TU}
+\MUC{ÄÖÜäöüß}%196 214 220 228 246 252 223
+\end{document}