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diff --git a/docs/tool/Modules/NaturalDocs/NDMarkup.pm b/docs/tool/Modules/NaturalDocs/NDMarkup.pm
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+###############################################################################
+#
+#   Package: NaturalDocs::NDMarkup
+#
+###############################################################################
+#
+#   A package of support functions for dealing with <NDMarkup>.
+#
+#   Usage and Dependencies:
+#
+#       The package doesn't depend on any Natural Docs packages and is ready to use right away.
+#
+###############################################################################
+
+# This file is part of Natural Docs, which is Copyright (C) 2003-2008 Greg Valure
+# Natural Docs is licensed under the GPL
+
+
+use strict;
+use integer;
+
+package NaturalDocs::NDMarkup;
+
+#
+#   Function: ConvertAmpChars
+#
+#   Substitutes certain characters with their <NDMarkup> amp chars.
+#
+#   Parameters:
+#
+#       text - The block of text to convert.
+#
+#   Returns:
+#
+#       The converted text block.
+#
+sub ConvertAmpChars #(text)
+    {
+    my ($self, $text) = @_;
+
+    $text =~ s/&/&amp;/g;
+    $text =~ s/</&lt;/g;
+    $text =~ s/>/&gt;/g;
+    $text =~ s/\"/&quot;/g;
+
+    return $text;
+    };
+
+
+#
+#   Function: RestoreAmpChars
+#
+#   Replaces <NDMarkup> amp chars with their original symbols.
+#
+#   Parameters:
+#
+#       text - The text to restore.
+#
+#   Returns:
+#
+#       The restored text.
+#
+sub RestoreAmpChars #(text)
+    {
+    my ($self, $text) = @_;
+
+    $text =~ s/&quot;/\"/g;
+    $text =~ s/&gt;/>/g;
+    $text =~ s/&lt;/</g;
+    $text =~ s/&amp;/&/g;
+
+    return $text;
+    };
+
+
+1;