diff -urN hugs98-plus-Sep2006.org/docs/users_guide/users_guide.xml hugs98-plus-Sep2006/docs/users_guide/users_guide.xml
--- hugs98-plus-Sep2006.org/docs/users_guide/users_guide.xml	2005-07-13 18:47:51.000000000 +0100
+++ hugs98-plus-Sep2006/docs/users_guide/users_guide.xml	2009-05-23 06:36:59.000000000 +0100
@@ -1,6 +1,5 @@
 <?xml version='1.0'?>
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-                    "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
                       [
 <!ENTITY faq            SYSTEM "faq.xml">
 <!ENTITY haskell98      SYSTEM "haskell98.xml">
@@ -13,12 +12,10 @@
 <!ENTITY others         SYSTEM "others.xml">
 <!ENTITY using-hugs     SYSTEM "using_hugs.xml">
 <!ENTITY % ISOpub PUBLIC
-       "ISO 8879:1986//ENTITIES Publishing//EN//XML"
-       "http://www.oasis-open.org/docbook/xmlcharent/0.3/iso-pub.ent">
+       "ISO 8879:1986//ENTITIES Publishing//EN//XML">
 %ISOpub;
 <!ENTITY % ISOtech PUBLIC
-       "ISO 8879:1986//ENTITIES General Technical//EN//XML"
-       "http://www.oasis-open.org/docbook/xmlcharent/0.3/iso-tech.ent">
+       "ISO 8879:1986//ENTITIES General Technical//EN//XML">
 %ISOtech;
 ]>
 <book id="users-guide">