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diff --git a/guile18/ice-9/mapping.scm b/guile18/ice-9/mapping.scm
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+;;; installed-scm-file
+
+;;;; 	Copyright (C) 1996, 2001, 2006 Free Software Foundation, Inc.
+;;;; 
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 2.1 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library 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
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;;;; 
+
+
+
+(define-module (ice-9 mapping)
+  :use-module (ice-9 poe)
+  :export (mapping-hooks-type make-mapping-hooks mapping-hooks?
+	   mapping-hooks-get-handle mapping-hooks-create-handle
+	   mapping-hooks-remove mapping-type make-mapping mapping?
+	   mapping-hooks mapping-data set-mapping-hooks! set-mapping-data!
+	   mapping-get-handle mapping-create-handle! mapping-remove!
+	   mapping-ref mapping-set!  hash-table-mapping-hooks
+	   make-hash-table-mapping hash-table-mapping))
+
+(define mapping-hooks-type (make-record-type 'mapping-hooks '(get-handle
+							      create-handle
+							      remove)))
+
+
+(define make-mapping-hooks (perfect-funcq 17 (record-constructor mapping-hooks-type)))
+(define mapping-hooks? (record-predicate mapping-hooks-type))
+(define mapping-hooks-get-handle (record-accessor mapping-hooks-type 'get-handle))
+(define mapping-hooks-create-handle (record-accessor mapping-hooks-type 'create-handle))
+(define mapping-hooks-remove (record-accessor mapping-hooks-type 'remove))
+
+(define mapping-type (make-record-type 'mapping '(hooks data)))
+(define make-mapping (record-constructor mapping-type))
+(define mapping? (record-predicate mapping-type))
+(define mapping-hooks (record-accessor mapping-type 'hooks))
+(define mapping-data (record-accessor mapping-type 'data))
+(define set-mapping-hooks! (record-modifier mapping-type 'hooks))
+(define set-mapping-data! (record-modifier mapping-type 'data))
+
+(define (mapping-get-handle map key)
+  ((mapping-hooks-get-handle (mapping-hooks map)) map key))
+(define (mapping-create-handle! map key . opts)
+  (apply (mapping-hooks-create-handle (mapping-hooks map)) map key opts))
+(define (mapping-remove! map key)
+  ((mapping-hooks-remove (mapping-hooks map)) map key))
+
+(define (mapping-ref map key . dflt)
+  (cond
+   ((mapping-get-handle map key)	=> cdr)
+   (dflt				=> car)
+   (else				#f)))
+
+(define (mapping-set! map key val)
+  (set-cdr! (mapping-create-handle! map key #f) val))
+
+
+
+(define hash-table-mapping-hooks
+  (let ((wrap (lambda (proc) (lambda (1st . rest) (apply proc (mapping-data 1st) rest)))))
+
+    (perfect-funcq 17
+		   (lambda (hash-proc assoc-proc delete-proc)
+		     (let ((procs (list hash-proc assoc-proc delete-proc)))
+		       (cond
+			((equal? procs `(,hashq ,assq ,delq!))
+			 (make-mapping-hooks (wrap hashq-get-handle)
+					     (wrap hashq-create-handle!)
+					     (wrap hashq-remove!)))
+			((equal? procs `(,hashv ,assv ,delv!))
+			 (make-mapping-hooks (wrap hashv-get-handle)
+					     (wrap hashv-create-handle!)
+					     (wrap hashv-remove!)))
+			((equal? procs `(,hash ,assoc ,delete!))
+			 (make-mapping-hooks (wrap hash-get-handle)
+					     (wrap hash-create-handle!)
+					     (wrap hash-remove!)))
+			(else
+			 (make-mapping-hooks (wrap
+					      (lambda (table key)
+						(hashx-get-handle hash-proc assoc-proc table key)))
+					     (wrap
+					      (lambda (table key)
+						(hashx-create-handle hash-proc assoc-proc table key)))
+					     (wrap
+					      (lambda (table key)
+						(hashx-get-handle hash-proc assoc-proc delete-proc table key)))))))))))
+
+(define (make-hash-table-mapping table hash-proc assoc-proc delete-proc)
+  (make-mapping (hash-table-mapping-hooks hash-proc assoc-proc delete-proc) table))
+
+(define (hash-table-mapping . options)
+  (let* ((size (or (and options (number? (car options)) (car options))
+		   71))
+	 (hash-proc (or (kw-arg-ref options #:hash-proc) hash))
+	 (assoc-proc (or (kw-arg-ref options #:assoc-proc)
+			 (cond
+			  ((eq? hash-proc hash) assoc)
+			  ((eq? hash-proc hashv) assv)
+			  ((eq? hash-proc hashq) assq)
+			  (else (error 'hash-table-mapping
+				       "Hash-procedure specified with no known assoc function."
+				       hash-proc)))))
+	 (delete-proc (or (kw-arg-ref options #:delete-proc)
+			  (cond
+			   ((eq? hash-proc hash) delete!)
+			   ((eq? hash-proc hashv) delv!)
+			   ((eq? hash-proc hashq) delq!)
+			   (else (error 'hash-table-mapping
+					"Hash-procedure specified with no known delete function."
+					hash-proc)))))
+	 (table-constructor (or (kw-arg-ref options #:table-constructor)
+				(lambda (len) (make-vector len '())))))
+    (make-hash-table-mapping (table-constructor size)
+			     hash-proc
+			     assoc-proc
+			     delete-proc)))
+