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diff --git a/TAO/tao/Transport_Descriptor_Interface.h b/TAO/tao/Transport_Descriptor_Interface.h
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+++ b/TAO/tao/Transport_Descriptor_Interface.h
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+// -*- C++ -*-
+
+// ===================================================================
+/**
+ *  @file   Transport_Descriptor_Interface.h
+ *
+ *  $Id$
+ *
+ *  @author Bala Natarajan <bala@cs.wustl.edu>
+ */
+// ===================================================================
+
+#ifndef TAO_CONNECTION_DESCRIPTOR_INTERFACE_H
+#define TAO_CONNECTION_DESCRIPTOR_INTERFACE_H
+
+#include /**/ "ace/pre.h"
+
+#include /**/ "tao/TAO_Export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "tao/Basic_Types.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class TAO_Endpoint;
+
+/**
+ * @class TAO_Transport_Descriptor_Interface
+ *
+ * @brief An abstract base class for Transport Property
+ *
+ * This class provides an abstract interface and holds minimal info
+ * on which the Transport Caching scheme is based on. Concrete
+ * connection properties can be got by inheriting from this class and
+ * implementing the virtual functions.
+ * Note 1: Additional properties for connection like Qos,
+ * Priority that the RT folks would need, can be added by
+ * inheriting from this class and providing the following
+ * methods.
+ * 1. duplicate ()
+ * 2. is_equivalent ()
+ * 3. hash ()
+ */
+class TAO_Export TAO_Transport_Descriptor_Interface
+{
+public:
+  /// Destructor
+  virtual ~TAO_Transport_Descriptor_Interface (void);
+
+  /// This call allocates and copies the contents of this class and
+  /// returns the pointer
+  virtual  TAO_Transport_Descriptor_Interface *duplicate (void) = 0;
+
+  /// Try to determine if this object is same as the @a other_prop.
+  virtual CORBA::Boolean is_equivalent (
+      const TAO_Transport_Descriptor_Interface *other_prop) = 0;
+
+  /// Generate hash value for our class
+  virtual u_long hash (void) const = 0;
+
+  /// Return the underlying endpoint object
+  TAO_Endpoint *endpoint (void);
+
+  /// Reset the endpoint pointer to point to another, if that one is
+  /// part of the chain based by the current endpoint. Although this
+  /// method is public it should only be used by the protocol specific
+  /// connector, right before caching, and only when a parallel
+  /// connect was attempted with more than one possible endpoints.
+  CORBA::Boolean reset_endpoint (TAO_Endpoint *ep);
+
+  /// Set the BiDir flag
+  void set_bidir_flag (CORBA::Boolean flag);
+
+protected:
+  /// Default Constructor
+  TAO_Transport_Descriptor_Interface (void);
+
+  /// Constructor
+  TAO_Transport_Descriptor_Interface (TAO_Endpoint *endpoint,
+                                      CORBA::Boolean take_ownership = false);
+
+  /// The base property of the connection ie. the peer's endpoint
+  TAO_Endpoint *endpoint_;
+
+  /// Should the endpoint be used in either direction?
+  CORBA::Boolean bidir_flag_;
+
+  /// Is the endpoint allocated on the heap? If so, we will have to
+  /// delete it when we destruct ourselves.
+  CORBA::Boolean release_;
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+# include "tao/Transport_Descriptor_Interface.inl"
+#endif /* __ACE_INLINE__ */
+
+#include /**/ "ace/post.h"
+
+#endif /*TAO_CONNECTION_DESCRIPTOR_INTERFACE_H*/