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diff --git a/trunk/ACE/ACEXML/common/XMLFilter.h b/trunk/ACE/ACEXML/common/XMLFilter.h
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+++ b/trunk/ACE/ACEXML/common/XMLFilter.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    XMLFilter.h
+ *
+ *  $Id$
+ *
+ *  @author Nanbor Wang <nanbor@cs.wustl.edu>
+ */
+//=============================================================================
+#ifndef _ACEXML_XMLFILTER_H_
+#define _ACEXML_XMLFILTER_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/XMLReader.h"
+
+/**
+ * @class ACEXML_XMLFilter XMLFilter.h "ACEXML/common/XMLFilter.h"
+ *
+ * @brief ACEXML_XMLFilter
+ *
+ * An XML filter is like an XML reader, except that it obtains its events
+ * from another XML reader rather than a primary source like an XML
+ * document or database. Filters can modify a stream of events as they pass
+ * on to the final application.
+ *
+ * The XMLFilterImpl helper class provides a convenient base for creating
+ * SAX2 filters, by passing on all ACEXML_EntityResolver,
+ * ACEXML_DTDHandler, ACEXML_ContentHandler and ACEXML_ErrorHandler events
+ * automatically.
+ */
+class ACEXML_Export ACEXML_XMLFilter : public ACEXML_XMLReader
+{
+public:
+  /**
+   * Get the parent reader.
+   */
+  virtual ACEXML_XMLReader *getParent (void) const = 0;
+
+  /**
+   * Set the parent reader.
+   */
+  virtual void setParent (ACEXML_XMLReader *parent) = 0;
+};
+
+
+#include /**/ "ace/post.h"
+
+#endif /* _ACEXML_XMLFILTER_H_ */