diff -r d5509912af18 -r c753196599f9 doc-src/TutorialI/Trie/document/Option2.tex
--- a/doc-src/TutorialI/Trie/document/Option2.tex	Tue Aug 29 11:52:47 2000 +0200
+++ b/doc-src/TutorialI/Trie/document/Option2.tex	Tue Aug 29 12:08:20 2000 +0200
@@ -1,6 +1,7 @@
-\begin{isabelle}%
+%
+\begin{isabellebody}%
 \isanewline
-\isacommand{datatype}\ {\isacharprime}a\ option\ {\isacharequal}\ None\ {\isacharbar}\ Some\ {\isacharprime}a\end{isabelle}%
+\isacommand{datatype}\ {\isacharprime}a\ option\ {\isacharequal}\ None\ {\isacharbar}\ Some\ {\isacharprime}a\end{isabellebody}%
 %%% Local Variables:
 %%% mode: latex
 %%% TeX-master: "root"