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+.\" Copyright (c) 2002, 2003 Tim J. Robbins
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 10, 2003
+.Dt GB18030 5
+.Os
+.Sh NAME
+.Nm gb18030
+.Nd "GB 18030 encoding method for Chinese text"
+.Sh SYNOPSIS
+.Nm ENCODING
+.Qq GB18030
+.Sh DESCRIPTION
+The
+.Nm GB18030
+encoding implements GB 18030-2000, a PRC national standard for the encoding of
+Chinese characters.
+It is a superset of the older GB\ 2312-1980 and GBK encodings,
+and incorporates Unicode's Unihan Extension A completely.
+It also provides code space for all Unicode 3.0 code points.
+.Pp
+Multibyte characters in the
+.Nm GB18030
+encoding can be one byte, two bytes, or
+four bytes long.
+There are a total of over 1.5 million code positions.
+.Pp
+.No GB\ 11383-1981 Pq Tn ASCII
+characters are represented by single bytes in the range 0x00 to 0x7F.
+.Pp
+Chinese characters are represented as either two bytes or four bytes.
+Characters that are represented by two bytes begin with a byte in the range
+0x81-0xFE and end with a byte either in the range 0x40-0x7E or 0x80-0xFE.
+.Pp
+Characters that are represented by four bytes begin with a byte in the range
+0x81-0xFE, have a second byte in the range 0x30-0x39, a third byte in the range
+0x81-0xFE and a fourth byte in the range 0x30-0x39.
+.Sh SEE ALSO
+.Xr euc 5 ,
+.Xr gb2312 5 ,
+.Xr gbk 5 ,
+.Xr utf8 5
+.Rs
+.%T "Chinese National Standard GB 18030-2000: Information Technology -- Chinese ideograms coded character set for information interchange -- Extension for the basic set"
+.%D "March 2000"
+.Re
+.Rs
+.%Q "The Unicode Consortium"
+.%T "The Unicode Standard, Version 3.0"
+.%D "2000"
+.Re
+.Sh STANDARDS
+The
+.Nm GB18030
+encoding is believed to be compatible with GB 18030-2000.