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diff --git a/TAO/TAO_IDL/include/ast_visitor.h b/TAO/TAO_IDL/include/ast_visitor.h
new file mode 100644
index 00000000000..1fbb566a744
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+++ b/TAO/TAO_IDL/include/ast_visitor.h
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+// $Id$
+
+/* -*- c++ -*- */
+// ============================================================================
+//
+// = LIBRARY
+//    TAO_IDL_FE_DLL
+//
+// = FILENAME
+//    ast_visitor.h
+//
+// = DESCRIPTION
+//    The abstract AST visitor base class.
+//
+// = AUTHOR
+//    Jeff Parsons <parsons@cs.wustl.edu>
+//
+// ============================================================================
+
+#ifndef TAO_IDL_FE_DLL_AST_VISITOR_H
+#define TAO_IDL_FE_DLL_AST_VISITOR_H
+
+#include "TAO_IDL_FE_Export.h"
+
+class AST_Decl;
+class UTL_Scope;
+class AST_Type;
+class AST_PredefinedType;
+class AST_Module;
+class AST_Interface;
+class AST_InterfaceFwd;
+class AST_ValueBox;
+class AST_ValueType;
+class AST_ValueTypeFwd;
+class AST_Component;
+class AST_ComponentFwd;
+class AST_EventType;
+class AST_EventTypeFwd;
+class AST_Home;
+class AST_Factory;
+class AST_Structure;
+class AST_StructureFwd;
+class AST_Exception;
+class AST_Expression;
+class AST_Enum;
+class AST_Operation;
+class AST_Field;
+class AST_Argument;
+class AST_Attribute;
+class AST_Union;
+class AST_UnionFwd;
+class AST_UnionBranch;
+class AST_UnionLabel;
+class AST_Constant;
+class AST_EnumVal;
+class AST_Array;
+class AST_Sequence;
+class AST_String;
+class AST_Typedef;
+class AST_Root;
+class AST_Native;
+
+class TAO_IDL_FE_Export ast_visitor
+{
+  //
+  // = TITLE
+  //    ast_visitor.
+  //
+  // = DESCRIPTION
+  //    To implement BE processing we use the "Visitor Pattern", this
+  //    is the abstract "Visitor". This class is the abstract base class
+  //    for visitors that traverse the AST_<node> classes. Other abstract
+  //    classes for C++ code generation, Java code generation, or IfR
+  //    administration, for example, can be derived from this class and
+  //    be the root of their own subtree of specialized visitor classes.
+  //
+public:
+  ast_visitor (void);
+  // Constructor.
+
+  virtual ~ast_visitor (void);
+  // Destructor.
+
+  virtual int visit_decl (AST_Decl *d) = 0;
+  // Visit a decl node.
+
+  virtual int visit_scope (UTL_Scope *node) = 0;
+  // Visit the scope
+
+  virtual int visit_type (AST_Type *node) = 0;
+  // Visit the type.
+
+  virtual int visit_predefined_type (AST_PredefinedType *node) = 0;
+  // Visit the predefined type.
+
+  virtual int visit_module (AST_Module *node) = 0;
+  // Visit module.
+
+  virtual int visit_interface (AST_Interface *node) = 0;
+  // Visit interface.
+
+  virtual int visit_interface_fwd (AST_InterfaceFwd *node) = 0;
+  // Visit interface_fwd
+
+  virtual int visit_valuetype (AST_ValueType *node) = 0;
+  // Visit valuetype.
+
+  virtual int visit_valuetype_fwd (AST_ValueTypeFwd *node) = 0;
+  // Visit valuetype_fwd
+
+  virtual int visit_component (AST_Component *node) = 0;
+  // Visit component.
+
+  virtual int visit_home (AST_Home *node) = 0;
+  // Visit home.
+
+  virtual int visit_component_fwd (AST_ComponentFwd *node) = 0;
+  // Visit component_fwd
+
+  virtual int visit_eventtype (AST_EventType *node) = 0;
+  // Visit eventtype.
+
+  virtual int visit_eventtype_fwd (AST_EventTypeFwd *node) = 0;
+  // Visit eventtype_fwd
+
+  virtual int visit_factory (AST_Factory *node) = 0;
+  // Visit a OBV factory construct.
+
+  virtual int visit_structure (AST_Structure *node) = 0;
+  // Visit a structure.
+
+  virtual int visit_structure_fwd (AST_StructureFwd *node) = 0;
+  // Visit a structure.
+
+  virtual int visit_exception (AST_Exception *node) = 0;
+  // Visit exception
+
+  virtual int visit_expression (AST_Expression *node) = 0;
+  // Visit expression.
+
+  virtual int visit_enum (AST_Enum *node) = 0;
+  // Visit an enum.
+
+  virtual int visit_operation (AST_Operation *node) = 0;
+  // Visit an operation.
+
+  virtual int visit_field (AST_Field *node) = 0;
+  // Visit a field.
+
+  virtual int visit_argument (AST_Argument *node) = 0;
+  // Visit argument.
+
+  virtual int visit_attribute (AST_Attribute *node) = 0;
+  // Visit an attribute.
+
+  virtual int visit_union (AST_Union *node) = 0;
+  // Visit union.
+
+  virtual int visit_union_fwd (AST_UnionFwd *node) = 0;
+  // Visit union.
+
+  virtual int visit_union_branch (AST_UnionBranch *node) = 0;
+  // Visit union branch.
+
+  virtual int visit_union_label (AST_UnionLabel *node) = 0;
+  // Visit union label.
+
+  virtual int visit_constant (AST_Constant *node) = 0;
+  // Visit a constant.
+
+  virtual int visit_enum_val (AST_EnumVal *node) = 0;
+  // Visit enum val.
+
+  virtual int visit_array (AST_Array *node) = 0;
+  // Visit an array.
+
+  virtual int visit_sequence (AST_Sequence *node) = 0;
+  // Visit a sequence.
+
+  virtual int visit_string (AST_String *node) = 0;
+  // Visit a string.
+
+  virtual int visit_typedef (AST_Typedef *node) = 0;
+  // Visit a typedef.
+
+  virtual int visit_root (AST_Root *node) = 0;
+  // Visit a root.
+
+  virtual int visit_native (AST_Native *node) = 0;
+  // Visit a native.
+
+  virtual int visit_valuebox (AST_ValueBox *node) = 0;
+  // Visit a valuebox.
+};
+
+#endif /* TAO_IDL_FE_DLL_AST_VISITOR_H */