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diff --git a/tutorial/examples/mixin/MixinedClass.java b/tutorial/examples/mixin/MixinedClass.java
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+/*
+ * This code was generated by ojc.
+ */
+/*
+ * MixinedClass.oj
+ *
+ * An OpenJava example for incorporating mixin mechanism.
+ *
+ * @author   Michiaki Tatsubori
+ * @version  %VERSION% %DATE%
+ * @see      java.lang.Object
+ *
+ * COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
+ */
+package examples.mixin;
+
+
+import java.lang.Object;
+import openjava.mop.*;
+import openjava.ptree.*;
+import openjava.syntax.*;
+
+
+/**
+ * The metaclass <code>MixinedClass</code> supports classes
+ * using mixin.
+ * <p>
+ * For example, the class <code>MixinedClass</code>:
+ * <pre>
+ * public class TextboxWithUndo instantiates MixinedClass
+ *    extends Textbox mixs Undo
+ * {
+ * }
+ * </pre>
+ * would be automatically implemented.
+ * <p>
+ *
+ * @author   Michiaki Tatsubori
+ * @version  1.0
+ * @since    $Id: MixinedClass.java,v 1.2 2003/02/19 02:55:01 tatsubori Exp $
+ * @see java.lang.Object
+ */
+public class MixinedClass extends OJClass
+{
+
+    public static final String KEY_MIXES = "mixes";
+
+    /* overrides for translation */
+    public void translateDefinition()
+        throws MOPException
+    {
+        OJClass[] mixinClasses = getMixins();
+        for (int i = 0; i < mixinClasses.length; ++i) {
+            incorporateMixin( mixinClasses[i] );
+        }
+    }
+
+    public void incorporateMixin( OJClass mixinClazz )
+        throws MOPException
+    {
+        addInterface( mixinClazz );
+        OJMethod[] mixeds = mixinClazz.getMethods();
+        for (int i = 0; i < mixeds.length; ++i) {
+            addMethod( makeEmptyMethod( mixeds[i] ) );
+        }
+    }
+
+    /**
+     * Generates a empty method with specified name.
+     *
+     * @param  name  generating method's name.
+     * @param forwarded  method to which the generated method forwards.
+     * @return  a generated empty method.
+     */
+    private OJMethod makeEmptyMethod( OJMethod implementee )
+        throws MOPException
+    {
+        StatementList body = new StatementList();
+        if (implementee.getReturnType() == OJSystem.VOID) {
+            body.add( new ReturnStatement() );
+        } else {
+            body.add( new ReturnStatement( Literal.constantNull() ) );
+        }
+        return new OJMethod( this, implementee.getModifiers().remove( OJModifier.ABSTRACT ), implementee.getReturnType(), implementee.getName(), implementee.getParameterTypes(), implementee.getExceptionTypes(), body );
+    }
+
+    /* extended information */
+    private OJClass[] getMixins()
+        throws MOPException
+    {
+        ObjectList suffix = (ObjectList) getSuffix( KEY_MIXES );
+        OJClass[] result = new OJClass[suffix.size()];
+        for (int i = 0; i < result.length; ++i) {
+            result[i] = OJClass.forName( suffix.get( i ).toString() );
+        }
+        return result;
+    }
+
+    /* override to extend syntax */
+    public static boolean isRegisteredKeyword( String keyword )
+    {
+        return keyword.equals( KEY_MIXES );
+    }
+
+    /* override to extend syntax */
+    public static SyntaxRule getDeclSuffixRule( String keyword )
+    {
+        if (keyword.equals( KEY_MIXES )) {
+            return new DefaultListRule( new TypeNameRule(), TokenID.COMMA );
+        }
+        return null;
+    }
+
+    public MixinedClass( openjava.mop.Environment oj_param0, openjava.mop.OJClass oj_param1, openjava.ptree.ClassDeclaration oj_param2 )
+    {
+        super( oj_param0, oj_param1, oj_param2 );
+    }
+
+    public MixinedClass( java.lang.Class oj_param0, openjava.mop.MetaInfo oj_param1 )
+    {
+        super( oj_param0, oj_param1 );
+    }
+
+}