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diff --git a/lisp/language/tai-viet.el b/lisp/language/tai-viet.el
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+;;; tai-viet.el --- support for Tai Viet -*- coding: utf-8; no-byte-compile: t -*-
+
+;; Copyright (C) 2007
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H13PRO009
+;; Copyright (C) 2007  Free Software Foundation, Inc.
+
+;; Keywords: multilingual, Tai Viet, i18n
+
+;; 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 2, 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.
+
+;;; Commentary:
+
+;; Tai Viet is being included in the Unicode at the range U+AA80..U+AADF.
+
+;;; Code:
+
+(set-char-table-range composition-function-table
+		      '(#xAA80 . #xAADF)
+		      'tai-viet-composition-function)
+
+(set-language-info-alist
+ "TaiViet" '((charset unicode)
+	      (coding-system utf-8)
+	      (coding-priority utf-8)
+	      (input-method . "tai-sonla")
+	      (sample-text
+	       "TaiViet (ꪁꪫꪱꪣ ꪽꪕ)\t\tꪅꪰꪙ꫃ ꪨꪮ꫃ ꪁꪫꪱ / ꪅꪾ ꪨ� ꪁꪫꪱ")
+	      (documentation . "\
+TaiViet refers to the Tai language used by Tai people in
+Vietnam, and also refers to the script used for this language.
+Both the script and language have the same origin as that of Thai
+language/script used in Thailand, but now they differ from each
+other in a significant way (especially the scripts are).
+
+The language name is spelled as \"ꪁꪫꪱꪣ ꪽꪕ\", and the script name is
+spelled as \"ꪎ� ꪽꪕ\" in the modern form, \"ꪎꪴ ꪽꪕ\" in the traditional
+from.
+
+As the proposal for TaiViet script to the Unicode is still on
+the progress, we use the Private Use Area for TaiViet
+characters (U+F000..U+F07E).  A TaiViet font encoded accordingly
+is available at this web page:
+    http://www.m17n.org/TaiViet/
+")))
+
+(provide 'tai-viet)
+
+;; Local Variables:
+;; coding: utf-8
+;; End:
diff --git a/lisp/language/tv-util.el b/lisp/language/tv-util.el
new file mode 100644
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+++ b/lisp/language/tv-util.el
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+;;; tv-util.el --- support for Tai Viet			-*- coding: utf-8 -*-
+
+;; Copyright (C) 2007
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H13PRO009
+
+;; Keywords: multilingual, Tai Viet, i18n
+
+;; 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 2, 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.
+
+;;; Code
+
+;; Regexp matching with a sequence of Tai Viet characters.
+(defconst tai-viet-re
+  (format "[\xaa80-\xaac2\xaadb-\xaadf]+"))
+
+;; Char-table of information about glyph type of Tai Viet characters.
+(defconst tai-viet-glyph-info
+  (let ((table (make-char-table nil))
+	(specials '((right-overhang . "ꪊꪋꪌꪍꪏꪓꪖꪜꪞꪡꪤꪨ")
+		    (left-overhang . "ꫂ")
+		    (combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
+		    (combining-tone . "꪿꫁"))))
+    ;; Set all TaiViet characters to `t'.
+    (set-char-table-range table (cons #xaa80 #xaac2) t)
+    (set-char-table-range table (cons #xaadb #xaadf) t)
+    ;; Overwrite it for special characters.
+    (dolist (elt specials)
+      (let ((category (car elt))
+	    (chars (cdr elt)))
+	(dotimes (i (length chars))
+	  (aset table (aref chars i) category))))
+    table))
+
+(defun tai-viet-compose-string (from to string)
+  "Compose Tai Viet characters in STRING between indices FROM and TO."
+  (let* ((ch (aref string from))
+	 (info (aref tai-viet-glyph-info ch))
+	 prev-info)
+    (if (eq info 'non-spacing)
+	(compose-string string from (1+ from) (string ch ?\t)))
+    (setq from (1+ from) prev-info info)
+    (while (and (< from to)
+		(tai-viet-char-p (setq ch (aref string from))))
+      (setq info (aref tai-viet-glyph-info ch))
+      (if (and (eq info 'non-spacing)
+	       (eq prev-info 'non-spacing))
+	  (compose-string from (1+ from) (string ?\t ch)))
+      (setq from (1+ from) prev-info info))
+    (if (eq info 'right-overhang)
+	(compose-string string (1- from) from (string ch ?\t)))
+    from))
+
+(defun tai-viet-compose-region (from to)
+  "Compose Tai Viet characters in the region between FROM and TO."
+  (decompose-region from to)
+  (let ((normal-rule '(Br . Bl))
+	(tone-rule '(tr . bl))
+	(prev-viet nil)
+	ch info pos components overhang)
+    (while (< from to) 
+      (or ch
+	  (setq ch (char-after from)
+		info (aref tai-viet-glyph-info ch)))
+      (setq from (1+ from))
+      (if (not info)
+	  (setq prev-viet nil
+		ch nil)
+	(if (memq info '(combining-vowel combining-tone))
+	    (progn
+	      ;; Display this as a spacing glyph.
+	      (compose-region (1- from) from (string ?\t ch))
+	      (setq prev-viet t
+		    ch nil))
+	  (setq pos (1- from)
+		components ch
+		overhang (if (eq info 'right-overhang)
+			     'right-overhang
+			   (if (and (not prev-viet) (eq info 'left-overhang))
+			       'left-overhang))
+		prev-viet t
+		ch nil)
+	  (if (and (< from to)
+		   (setq ch (char-after from)
+			 info (aref tai-viet-glyph-info ch)))
+	      (if (memq info '(combining-vowel combining-tone))
+		  (progn
+		    (setq components
+			  (list components normal-rule ch)
+			  from (1+ from)
+			  ch nil)
+		    (if (and (< from to)
+			     (setq ch (char-after from)
+				   info (aref tai-viet-glyph-info ch))
+			     (eq info 'combining-tone))
+			(setq components (nconc components
+						(list tone-rule ch))
+			      from (1+ from)))
+		    (if (eq overhang 'left-overhang)
+			(setq components (cons ?\t
+					       (cons normal-rule components)))
+		      (if (and (eq overhang 'right-overhang)
+			       (>= from to))
+			  (setq components (nconc components
+						  (list normal-rule ?\t)))))
+		    (compose-region pos from components))
+		(if (eq overhang 'left-overhang)
+		    (compose-region pos from (string ?\t components))))
+	    (if (eq overhang 'left-overhang)
+		(compose-region pos from (string ?\t components))
+	      (if (and (eq overhang 'right-overhang) (>= from to))
+		  (compose-region pos from (string components ?\t))))))))
+    from))
+
+
+;;;###autoload
+(defun tai-viet-composition-function (pos &optional string)
+  (let (to)
+    (if string
+	(progn
+	  (if (string-match tai-viet-re string pos)
+	      (tai-viet-compose-string pos (match-end 0) string)
+	    (1+ pos)))
+      (goto-char pos)
+      (if (looking-at tai-viet-re)
+	  (tai-viet-compose-region pos (match-end 0))
+	(1+ pos)))))
+
+;;
+(provide 'tai-viet-util)