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+# README file for charset mapping files in this directory.
+# Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
+#   National Institute of Advanced Industrial Science and Technology (AIST)
+#   Registration Number H13PRO009
+# Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
+#   Free Software Foundation, Inc.
+
+# This file is part of GNU Emacs.
+
+# GNU Emacs 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 3, or (at your option)
+# any later version.
+
+# GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+
+
+(1) Format of mapping files
+
+Each line contains a code point and the corresponding Unicode
+character code separated by a space.  Both code points and Unicode
+character codes are in hexadecimal preceded by "0x".  Comments may be
+used, starting with "#".  Code ranges may also be used, with
+(inclusive) start and end code points separated by "-" followed by the
+unicode of the start of the range
+
+Examples:
+0xA0 0x00A0  # no-break space
+
+0x8141-0x8143 0x4E04 # map onto a Unicode range
+
+
+(2) Source of mapping files
+
+All mapping files are generated automatically from data files freely
+available on the Internet (e.g. glibc/localedata/charmaps").  See the
+file ../../admin/charsets/Makefile for the detail.