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diff --git a/src/main/java/io/devnulllabs/openjava/ptree/Expression.java b/src/main/java/io/devnulllabs/openjava/ptree/Expression.java
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+++ b/src/main/java/io/devnulllabs/openjava/ptree/Expression.java
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+/*
+ * Expression.java 1.0
+ *
+ *
+ * Jun 20, 1997
+ * Sep 29, 1997
+ *
+ * @see io.devnulllabs.openjava.ptree.ParseTree
+ * @version 1.0 last updated:  Sep 29, 1997
+ * @author  Teruo -bv- Koyanagi
+ */
+package io.devnulllabs.openjava.ptree;
+
+
+import io.devnulllabs.openjava.mop.Environment;
+import io.devnulllabs.openjava.mop.OJClass;
+
+
+
+/**
+ * The Expression interface presents common interface
+ * to access Expression node of parse tree
+ *
+ * this interface is implements by
+ * <pre>
+ *   UnaryExpression
+ *   BinaryExpression
+ *   ConditionalExpression
+ *   AssignmentExpression
+ *   CastExpression
+ *   AllocationExpression
+ *   ArrayAllocationExpression
+ *   Variable
+ *   MethodCall
+ *   SpecialName
+ *   Literal
+ *   ClassLiteral
+ *   ArrayAccess
+ *   FieldAccess
+ * </pre>
+ *
+ * @see io.devnulllabs.openjava.ptree.ParseTree
+ * @see io.devnulllabs.openjava.ptree.NonLeaf
+ * @see io.devnulllabs.openjava.ptree.VariableInitializer
+ */
+public interface Expression extends ParseTree, VariableInitializer
+{
+    public OJClass getType( Environment env )
+    throws Exception;
+}