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diff --git a/ACE/ACEXML/common/Validator.h b/ACE/ACEXML/common/Validator.h
new file mode 100644
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+++ b/ACE/ACEXML/common/Validator.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Validator.h
+ *
+ *  $Id$
+ *
+ *  @author Nanbor Wang <nanbor@cs.wustl.edu>
+ */
+//=============================================================================
+#ifndef _ACEXML_VALIDATOR_H_
+#define _ACEXML_VALIDATOR_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/Attributes.h"
+#include "ACEXML/common/Env.h"
+#include "ACEXML/common/SAXExceptions.h"
+
+/**
+ * @class ACEXML_Validator Validator.h "common/Validator.h"
+ *
+ * @brief An abstract virtual class defining validator interface.
+ *
+ * An validator provides validation service for one XML element.
+ * ACEXML_Validators are stateful object.  Implementations should
+ * remember the current element encountered and determine if
+ * it's a valid sequence of child elements.  A parser fishes
+ * out a validator of certain
+ */
+class ACEXML_Export ACEXML_Validator
+{
+public:
+  virtual ~ACEXML_Validator () = 0;
+
+  /**
+   * Validate attributes of an element.
+   *
+   * @retval 0 if valid, -1 otherwise.
+   */
+  virtual int startElement (ACEXML_Attributes *atts ACEXML_ENV_ARG_DECL)
+        ACE_THROW_SPEC ((ACEXML_SAXException)) = 0;
+
+  /**
+   * Validate the next child element.
+   *
+   * @retval 0 if valid, -1 otherwise.
+   */
+  virtual int nextElement (const ACEXML_Char *namespaceURI,
+                            const ACEXML_Char *localName,
+                            const ACEXML_Char *qName ACEXML_ENV_ARG_DECL)
+        ACE_THROW_SPEC ((ACEXML_SAXException)) = 0;
+};
+
+
+#include /**/ "ace/post.h"
+
+#endif /* _ACEXML_VALIDATOR_H_ */