diff --git a/Scripts/Bash/Functions/Render/Docbook/docbook_expandSystemEntities.sh b/Scripts/Bash/Functions/Render/Docbook/docbook_expandSystemEntities.sh
new file mode 100755
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+++ b/Scripts/Bash/Functions/Render/Docbook/docbook_expandSystemEntities.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+#
+# docbook_expandSystemEntities.sh -- This function expands system
+# entities required by DocBook projects stored under
+# `trunk/Documentation/Manuals' directory.
+#
+# Copyright (C) 2009-2012 The CentOS Project
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+# ----------------------------------------------------------------------
+# $Id$
+# ----------------------------------------------------------------------
+
+
+function docbook_expandSystemEntities {
+
+    # Define absolute path to instance where all operations will take
+    # place in.
+    local INSTANCE=$1
+
+    # Define absolute path to both common and specific system
+    # entities.
+    local ENTITIES_PATHS="$(cli_getFilesList ${DOCBOOK_MODELS_DIR}/Book ${ACTIONVAL} \
+        --pattern=".ent$" --maxdepth=1 --mindepth=1 --type='f')"
+
+    # Build definition of both common and specific system entities.
+    local ENTITIES="$(\
+        for ENTITY_PATH in $ENTITIES_PATHS;do
+            local ENTITY_NAME=$(basename ${ENTITY_PATH})
+            echo '\n\t<!ENTITY % '${ENTITY_NAME}' SYSTEM "'${ENTITY_PATH}'">\n'
+            echo '\t%'${ENTITY_NAME}';'
+        done)" 
+
+    # Define both xml and docbook public definition.
+    local PREAMBLE="<?xml version=\"1.0\" ?>"
+    PREAMBLE="${PREAMBLE}\n<!DOCTYPE book PUBLIC \"-//OASIS//DTD DocBook XML V4.4//EN\" "
+    PREAMBLE="${PREAMBLE}\n\t\"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd\" ["
+    PREAMBLE="${PREAMBLE}\n${ENTITIES}"
+    PREAMBLE="${PREAMBLE}\n\t]>"
+
+    # Remove both xml and docbook preamble from instance and insert
+    # it again with definitions of required common and specific system
+    # entities.
+    sed -r -i "1,2c$(echo $PREAMBLE)" ${INSTANCE}
+
+}