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diff --git a/kdoctools/docbook/xml-dtd-4.2/ent/iso-amsc.ent b/kdoctools/docbook/xml-dtd-4.2/ent/iso-amsc.ent
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+<!-- iso-amsc.ent (initially distributed with DocBook XML DTD V4.1.1beta1) -->
+
+<!-- Derived from the corresponding ISO 8879 standard entity set
+     and the Unicode character mappings provided by Sebastian Rahtz -->
+
+<!ENTITY rceil	"&#x2309;"> <!-- RIGHT CEILING -->
+<!ENTITY rfloor	"&#x230B;"> <!-- RIGHT FLOOR -->
+<!ENTITY rpargt	"&#xE291;"> <!--  -->
+<!ENTITY urcorn	"&#x231D;"> <!-- TOP RIGHT CORNER -->
+<!ENTITY drcorn	"&#x231F;"> <!-- BOTTOM RIGHT CORNER -->
+<!ENTITY lceil	"&#x2308;"> <!-- LEFT CEILING -->
+<!ENTITY lfloor	"&#x230A;"> <!-- LEFT FLOOR -->
+<!--     lpargt	Unknown unicode character -->
+<!ENTITY ulcorn	"&#x231C;"> <!-- TOP LEFT CORNER -->
+<!ENTITY dlcorn	"&#x231E;"> <!-- BOTTOM LEFT CORNER -->