<!DOCTYPE BOOK PUBLIC "-//OASIS//DTD DocBook V4.1//EN" [
<!ENTITY mlang SYSTEM "cases/mlang.sgm">
]>
<book lang="de">
<bookinfo>
<title>Book Title</title>
<abstract>
<para>
To test multilingual capability, this book claims to be in German.
Of course, I don't know a word of German so it's really mostly
English.
</para>
</abstract>
</bookinfo>
&mlang;
</book>
