--- docbook-xml-4.2/catalog.xml.orig	2002-07-17 20:14:41 +0400
+++ docbook-xml-4.2/catalog.xml	2012-08-17 09:33:15 +0400
@@ -25,6 +25,12 @@
 <public publicId="-//OASIS//DTD DocBook XML V4.2//EN"
         uri="docbookx.dtd"/>
 
+<system systemId="http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
+        uri="docbookx.dtd"/>
+
+<system systemId="http://docbook.org/xml/4.2/docbookx.dtd"
+        uri="docbookx.dtd"/>
+
 <!-- ...................................................................... -->
 <!-- DocBook modules ...................................................... -->