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diff --git a/ACE/ACEXML/common/DefaultHandler.h b/ACE/ACEXML/common/DefaultHandler.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    DefaultHandler.h
+ *
+ *  $Id$
+ *
+ *  @author Nanbor Wang <nanbor@cs.wustl.edu>
+ */
+//=============================================================================
+#ifndef ACEXML_DEFAULTHANDLER_H
+#define ACEXML_DEFAULTHANDLER_H
+
+#include /**/ "ace/pre.h"
+#include "ACEXML/common/ACEXML_Export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+#pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ACEXML/common/ContentHandler.h"
+#include "ACEXML/common/DTDHandler.h"
+#include "ACEXML/common/EntityResolver.h"
+#include "ACEXML/common/ErrorHandler.h"
+
+/**
+ * @class ACEXML_DefaultHandler DefaultHandler.h "ACEXML/common/DefaultHandler.h"
+ *
+ * @brief ACEXML_DefaultHandler
+ *
+ * This class is available as a convenience base class for SAX2
+ * applications: it provides default implementations for all of the
+ * callbacks in the four core SAX2 handler classes:
+ *
+ * - EntityResolver
+ * - DTDHandler
+ * - ContentHandler
+ * - ErrorHandler
+ *
+ * Application writers can extend this class when they need to implement
+ * only part of an interface; parser writers can instantiate this class to
+ * provide default handlers when the application has not supplied its own.
+ */
+class ACEXML_Export ACEXML_DefaultHandler
+  : public ACEXML_ContentHandler,
+    public ACEXML_DTDHandler,
+    public ACEXML_EntityResolver,
+    public ACEXML_ErrorHandler
+{
+public:
+  /**
+   * Default constructor.
+   */
+  ACEXML_DefaultHandler (void);
+
+  /**
+   * destructor.
+   */
+  virtual ~ACEXML_DefaultHandler (void);
+
+  // Methods inherit from ACEXML_ContentHandler.
+
+  /*
+   * Receive notification of character data.
+   */
+  virtual void characters (const ACEXML_Char *ch,
+                           size_t start,
+                           size_t length);
+
+  /*
+   * Receive notification of the end of a document.
+   */
+  virtual void endDocument (void);
+
+  /*
+   * Receive notification of the end of an element.
+   */
+  virtual void endElement (const ACEXML_Char *namespaceURI,
+                           const ACEXML_Char *localName,
+                           const ACEXML_Char *qName);
+
+  /*
+   * End the scope of a prefix-URI mapping.
+   */
+  virtual void endPrefixMapping (const ACEXML_Char *prefix);
+
+  /*
+   * Receive notification of ignorable whitespace in element content.
+   */
+  virtual void ignorableWhitespace (const ACEXML_Char *ch,
+                                    int start,
+                                    int length);
+
+  /*
+   * Receive notification of a processing instruction.
+   */
+  virtual void processingInstruction (const ACEXML_Char *target,
+                                      const ACEXML_Char *data);
+
+  /*
+   * Receive an object for locating the origin of SAX document events.
+   */
+  virtual void setDocumentLocator (ACEXML_Locator *locator) ;
+
+  /*
+   * Receive notification of a skipped entity.
+   */
+  virtual void skippedEntity (const ACEXML_Char *name);
+
+  /*
+   * Receive notification of the beginning of a document.
+   */
+  virtual void startDocument (void);
+
+  /*
+   * Receive notification of the beginning of an element.
+   */
+  virtual void startElement (const ACEXML_Char *namespaceURI,
+                             const ACEXML_Char *localName,
+                             const ACEXML_Char *qName,
+                             ACEXML_Attributes *atts);
+
+  /*
+   * Begin the scope of a prefix-URI Namespace mapping.
+   */
+  virtual void startPrefixMapping (const ACEXML_Char *prefix,
+                                   const ACEXML_Char *uri);
+
+  // *** Methods inherit from ACEXML_DTDHandler.
+
+  /*
+   * Receive notification of a notation declaration event.
+   */
+  virtual void notationDecl (const ACEXML_Char *name,
+                             const ACEXML_Char *publicId,
+                             const ACEXML_Char *systemId);
+
+  /*
+   * Receive notification of an unparsed entity declaration event.
+   */
+  virtual void unparsedEntityDecl (const ACEXML_Char *name,
+                                   const ACEXML_Char *publicId,
+                                   const ACEXML_Char *systemId,
+                                   const ACEXML_Char *notationName);
+
+  // Methods inherit from ACEXML_EnitityResolver.
+
+  /*
+   * Allow the application to resolve external entities.
+   */
+  virtual ACEXML_InputSource *resolveEntity (const ACEXML_Char *publicId,
+                                             const ACEXML_Char *systemId);
+
+  // Methods inherit from ACEXML_ErrorHandler.
+
+  /*
+   * Receive notification of a recoverable error.
+   */
+  virtual void error (ACEXML_SAXParseException &exception);
+
+  /*
+   * Receive notification of a non-recoverable error.
+   */
+  virtual void fatalError (ACEXML_SAXParseException &exception);
+
+  /*
+   * Receive notification of a warning.
+   */
+  virtual void warning (ACEXML_SAXParseException &exception);
+};
+
+#include /**/ "ace/post.h"
+
+#endif /* ACEXML_DEFAULTHANDLER_H */