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diff --git a/Lisp/class-definition.lisp b/Lisp/class-definition.lisp
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+;;;; Objective-CL, an Objective-C bridge for Common Lisp.
+;;;; Copyright (C) 2007  Matthias Andreas Benkard.
+;;;;
+;;;; This program 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 3 of
+;;;; the License, or (at your option) any later version.
+;;;;
+;;;; This program 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 program.  If not, see
+;;;; <http://www.gnu.org/licenses/>.
+
+(in-package #:mulk.objective-cl)
+
+
+(defclass foreign-slot-definition-mixin ()
+  ((foreign-name :initarg :foreign-name
+                 :initform nil
+                 :accessor slot-definition-foreign-name
+                 :type (or null string))
+   (foreign-type :initarg :foreign-type
+                 :initform nil
+                 :accessor slot-definition-foreign-type)
+   #+(#:unused)
+   (property :initarg :property
+             :accessor slot-definition-property-p
+             :type boolean)))
+
+(defclass foreign-direct-slot-definition
+     (foreign-slot-definition-mixin c2mop:standard-direct-slot-definition)
+  ())
+
+(defclass foreign-effectve-slot-definition
+     (foreign-slot-definition-mixin c2mop:standard-effective-slot-definition)
+  ())
+
+(defclass objective-c-class (standard-class)
+  ((class-ptr :initarg :class-ptr
+              :type c-pointer
+              :accessor pointer-to)))
+
+
+(defmethod c2mop:direct-slot-definition-class ((class objective-c-class)
+                                         &rest initargs)
+  (if (some #'(lambda (symbol) (let ((nada '#:nada))
+                                 (not (eq nada (getf initargs symbol nada)))))
+            '(:foreign-type :foreign-name))
+      (find-class 'foreign-direct-slot-definition)
+      (find-class 'c2mop:standard-direct-slot-definition)))
+
+
+(defmethod c2mop:effective-slot-definition-class ((class objective-c-class)
+                                            &rest initargs)
+  (if (some #'(lambda (symbol) (let ((nada '#:nada))
+                                 (not (eq nada (getf initargs symbol nada)))))
+            '(:foreign-type :foreign-name))
+      (find-class 'foreign-direct-slot-definition)
+      (find-class 'c2mop:standard-direct-slot-definition)))
+
+
+(defmethod c2mop:slot-value-using-class ((class objective-c-class)
+                                         instance
+                                         effective-slot-definition)
+  (etypecase effective-slot-definition
+    (standard-effective-slot-definition (call-next-method))
+    (foreign-effective-slot-definition
+     (cerror "FIXME" '()))))
+
+
+(defmethod (setf c2mop:slot-value-using-class) (value
+                                                (class objective-c-class)
+                                                instance
+                                                effective-slot-definition)
+  (etypecase effective-slot-definition
+    (standard-effective-slot-definition (call-next-method))
+    (foreign-effective-slot-definition
+     (cerror "FIXME" '()))))
+
+
+(defmethod c2mop:compute-slots ((class objective-c-class))
+  ;; FIXME: Maybe add lots of foreign slots here whose presence the
+  ;; Objective-C runtime tells us.
+  (call-next-method))
+
+
+#+(or)
+(defmethod make-instance ((class-name (eql 'objective-c-class)) &rest initargs)
+  (let ((class (call-next-method)))
+    class))
+
+#+(or)
+(defmethod initialize-instance ((class objective-c-class)
+                                &key documentation
+                                     name
+                                     plist
+                                     direct-superclasses
+                                     direct-slots
+                                     direct-default-initargs
+                                     class-ptr
+                                     wrapped-foreign-class)
+  (call-next-method))
+
+#+(or)
+(defmethod reinitialize-instance ((class objective-c-class)
+                                  &key documentation
+                                       name
+                                       plist
+                                       direct-superclasses
+                                       direct-slots
+                                       direct-default-initargs
+                                       class-ptr
+                                       wrapped-foreign-class)
+  (call-next-method))
+
+#+(or)
+(defmethod c2mop:compute-effective-slot-definition ((class objective-c-class)
+                                                    slot-name
+                                                    direct-slots)
+  (call-next-method))
+
+
+#+(or)
+(make-instance 'objective-c-class :wrapped-foreign-class "NSString")
+#+(or)
+(c2mop:ensure-class 'ns-string
+                    :metaclass 'objective-c-class
+                    :wrapped-foreign-class "NSString")
+#+(or)
+(defclass ns-string ()
+  ((bla :foreign-type 'string
+        :foreign-name "_bla"
+        :accessor ns-string-bla)
+   (nothing :accessor ns-string-nothing
+            :initarg :ns-string
+            :initform 100))
+  (:metaclass objective-c-class)
+  (:wrapped-foreign-class "NSString"))