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diff --git a/src/org/eclipse/jdt/internal/compiler/classfmt/ClassFileConstants.java b/src/org/eclipse/jdt/internal/compiler/classfmt/ClassFileConstants.java
new file mode 100644
index 0000000..127b0cd
--- /dev/null
+++ b/src/org/eclipse/jdt/internal/compiler/classfmt/ClassFileConstants.java
@@ -0,0 +1,63 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.compiler.classfmt;
+
+import org.eclipse.jdt.internal.compiler.env.*;
+
+public interface ClassFileConstants extends IConstants {
+	
+	int Utf8Tag = 1;
+	int IntegerTag = 3;
+	int FloatTag = 4;
+	int LongTag = 5;
+	int DoubleTag = 6;
+	int ClassTag = 7;
+	int StringTag = 8;
+	int FieldRefTag = 9;
+	int MethodRefTag = 10;
+	int InterfaceMethodRefTag = 11;
+	int NameAndTypeTag = 12;
+	
+	int ConstantMethodRefFixedSize = 5;
+	int ConstantClassFixedSize = 3;
+	int ConstantDoubleFixedSize = 9;
+	int ConstantFieldRefFixedSize = 5;
+	int ConstantFloatFixedSize = 5;
+	int ConstantIntegerFixedSize = 5;
+	int ConstantInterfaceMethodRefFixedSize = 5;
+	int ConstantLongFixedSize = 9;
+	int ConstantStringFixedSize = 3;
+	int ConstantUtf8FixedSize = 3;
+	int ConstantNameAndTypeFixedSize = 5;
+	
+	int MAJOR_VERSION_1_1 = 45;
+	int MAJOR_VERSION_1_2 = 46;
+	int MAJOR_VERSION_1_3 = 47;
+	int MAJOR_VERSION_1_4 = 48;
+	int MAJOR_VERSION_1_5 = 49; 
+	
+	int MINOR_VERSION_0 = 0;
+	int MINOR_VERSION_1 = 1;
+	int MINOR_VERSION_2 = 2;	
+	int MINOR_VERSION_3 = 3;	
+	
+	// JDK 1.1 -> 1.5, comparable value allowing to check both major/minor version at once 1.4.1 > 1.4.0
+	// 16 unsigned bits for major, then 16 bits for minor
+	long JDK1_1 = ((long)ClassFileConstants.MAJOR_VERSION_1_1 << 16) + ClassFileConstants.MINOR_VERSION_3; // 1.1. is 45.3
+	long JDK1_2 =  ((long)ClassFileConstants.MAJOR_VERSION_1_2 << 16) + ClassFileConstants.MINOR_VERSION_0;
+	long JDK1_3 =  ((long)ClassFileConstants.MAJOR_VERSION_1_3 << 16) + ClassFileConstants.MINOR_VERSION_0;
+	long JDK1_4 = ((long)ClassFileConstants.MAJOR_VERSION_1_4 << 16) + ClassFileConstants.MINOR_VERSION_0;
+	long JDK1_5 = ((long)ClassFileConstants.MAJOR_VERSION_1_5 << 16) + ClassFileConstants.MINOR_VERSION_0;	
+	
+	// jdk level used to denote future releases: optional behavior is not enabled for now, but may become so. In order to enable these,
+	// search for references to this constant, and change it to one of the official JDT constants above.
+	long JDK_DEFERRED = Long.MAX_VALUE; 
+}