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-rw-r--r--chapter04/chapter04.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/chapter04/chapter04.xml b/chapter04/chapter04.xml
index 25c188020..689932619 100644
--- a/chapter04/chapter04.xml
+++ b/chapter04/chapter04.xml
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>