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diff --git a/TAO/tao/DynamicInterface/Dynamic_Implementation.h b/TAO/tao/DynamicInterface/Dynamic_Implementation.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Dynamic_Implementation.h
+ *
+ *  $Id$
+ *
+ *  Header file for class TAO_DynamicImplementation.
+ *
+ *
+ *  @author Irfan Pyarali <irfan@cs.wustl.edu>
+ */
+//=============================================================================
+
+
+#ifndef TAO_DYNAMIC_IMPLEMENTATION_H
+#define TAO_DYNAMIC_IMPLEMENTATION_H
+
+#include /**/ "ace/pre.h"
+
+#include "tao/DynamicInterface/dynamicinterface_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "tao/PortableServer/Servant_Base.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+namespace CORBA
+{
+  typedef char *RepositoryId;
+  typedef String_var RepositoryId_var;
+
+  class ServerRequest;
+  typedef ServerRequest *ServerRequest_ptr;
+}
+
+/**
+ * @class TAO_DynamicImplementation
+ *
+ * @brief Base class for DSI.
+ *
+ * It is expected that the <invoke> and <_primary_interface>
+ * methods will be only invoked by the POA in the context of
+ * serving a CORBA request. Invoking this method in other
+ * circumstances may lead to unpredictable results.
+ */
+class TAO_DynamicInterface_Export TAO_DynamicImplementation
+  : public virtual TAO_ServantBase
+{
+public:
+  /// The invoke() method receives requests issued to any CORBA object
+  /// incarnated by the DSI servant and performs the processing
+  /// necessary to execute the request.
+  virtual void invoke (CORBA::ServerRequest_ptr request) = 0;
+
+  /// The _primary_interface() method receives an ObjectId value and a
+  /// POA_ptr as input parameters and returns a valid RepositoryId
+  /// representing the most-derived interface for that oid.
+  virtual CORBA::RepositoryId _primary_interface (
+      const PortableServer::ObjectId &oid,
+      PortableServer::POA_ptr poa) = 0;
+
+  /// Local implementation of the CORBA::Object::_is_a method.
+  virtual CORBA::Boolean _is_a (const char *logical_type_id);
+
+  /// Returns a CORBA::Object_ptr for the target object.
+  CORBA::Object_ptr _this (void);
+
+  /// Query the Interface Repository for the interface definition.
+  virtual CORBA::InterfaceDef_ptr _get_interface (void);
+
+protected:
+
+  /// Return 0.  Should never be used.
+  virtual const char *_interface_repository_id (void) const;
+
+  /// Simply returns "this"
+  virtual void *_downcast (const char *repository_id);
+
+  /// This is an auxiliary method for _this() and _narrow().
+  virtual TAO_Stub *_create_stub (void);
+
+  /// Turns around and calls invoke.
+  virtual void _dispatch (TAO_ServerRequest &request, void *context);
+
+private:
+  /// Encapsulates code common to _is_a(), _get_interface() and _create_stub().
+  CORBA::RepositoryId get_id_from_primary_interface (void);
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+
+#endif /* TAO_DYNAMIC_IMPLEMENTATION_H */