diff -NurdB docbook-sgml-dtd/docbook.cat docbook-sgml-dtd_patch/docbook.cat
--- docbook-sgml-dtd/docbook.cat	2006-10-03 15:27:50.000000000 +0200
+++ docbook-sgml-dtd_patch/docbook.cat	2007-08-14 00:43:31.485987458 +0200
@@ -19,6 +19,8 @@
   -- ...................................................................... --
   -- DocBook driver file .................................................. --
 
+DTDDECL "-//OASIS//DTD DocBook V4.5//EN" "docbook.dcl"
+
 PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
        "docbook.dtd"
 
@@ -52,65 +54,7 @@
 PUBLIC "-//OASIS//ENTITIES DocBook Character Entities V4.5//EN"
        "dbcentx.mod"
 
-  -- ...................................................................... --
-  -- ISO entity sets ...................................................... --
-
-PUBLIC "ISO 8879:1986//ENTITIES Diacritical Marks//EN"
-       "iso-dia.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN"
-       "iso-num.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Publishing//EN"
-       "iso-pub.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES General Technical//EN"
-       "iso-tech.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Latin 1//EN"
-       "iso-lat1.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Latin 2//EN"
-       "iso-lat2.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Greek Letters//EN"
-       "iso-grk1.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Monotoniko Greek//EN"
-       "iso-grk2.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Greek Symbols//EN"
-       "iso-grk3.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Alternative Greek Symbols//EN"
-       "iso-grk4.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Arrow Relations//EN"
-       "iso-amsa.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Binary Operators//EN"
-       "iso-amsb.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Delimiters//EN"
-       "iso-amsc.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Negated Relations//EN"
-       "iso-amsn.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Ordinary//EN"
-       "iso-amso.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Added Math Symbols: Relations//EN"
-       "iso-amsr.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Box and Line Drawing//EN"
-       "iso-box.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Russian Cyrillic//EN"
-       "iso-cyr1.gml"
-
-PUBLIC "ISO 8879:1986//ENTITIES Non-Russian Cyrillic//EN"
-       "iso-cyr2.gml"
 
+ 
   -- End of catalog data for DocBook V4.5 ................................. --
   -- ...................................................................... --