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diff --git a/TAO/orbsvcs/orbsvcs/Event/EC_Negation_Filter.h b/TAO/orbsvcs/orbsvcs/Event/EC_Negation_Filter.h
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+// -*- C++ -*-
+
+/**
+ *  @file   EC_Negation_Filter.h
+ *
+ *  $Id$
+ *
+ *  @author Carlos O'Ryan (coryan@cs.wustl.edu)
+ *
+ * Based on previous work by Tim Harrison (harrison@cs.wustl.edu) and
+ * other members of the DOC group. More details can be found in:
+ *
+ * http://doc.ece.uci.edu/~coryan/EC/index.html
+ */
+
+#ifndef TAO_EC_NEGATION_FILTER_H
+#define TAO_EC_NEGATION_FILTER_H
+#include /**/ "ace/pre.h"
+
+#include "orbsvcs/Event/EC_Filter.h"
+#include /**/ "orbsvcs/Event/event_serv_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+/**
+ * @class TAO_EC_Negation_Filter
+ *
+ * @brief The negation filter.
+ *
+ * This filter accepts all the events rejected by its child, and
+ * rejects any events accepted by the child.
+ *
+ * <H2>Memory Management</H2>
+ * It assumes ownership of its child.
+ */
+class TAO_RTEvent_Serv_Export TAO_EC_Negation_Filter : public TAO_EC_Filter
+{
+public:
+  /// Constructor. It assumes ownership of the child.
+  TAO_EC_Negation_Filter (TAO_EC_Filter* child);
+
+  /// Destructor
+  virtual ~TAO_EC_Negation_Filter (void);
+
+
+  // = The TAO_EC_Filter methods, please check the documentation in
+  // TAO_EC_Filter.
+  virtual ChildrenIterator begin (void) const;
+  virtual ChildrenIterator end (void) const;
+  virtual int size (void) const;
+  virtual int filter (const RtecEventComm::EventSet& event,
+                      TAO_EC_QOS_Info& qos_info);
+  virtual int filter_nocopy (RtecEventComm::EventSet& event,
+                             TAO_EC_QOS_Info& qos_info);
+  virtual void push (const RtecEventComm::EventSet& event,
+                     TAO_EC_QOS_Info& qos_info);
+  virtual void push_nocopy (RtecEventComm::EventSet& event,
+                            TAO_EC_QOS_Info& qos_info);
+  virtual void clear (void);
+  virtual CORBA::ULong max_event_size (void) const;
+  virtual int can_match (const RtecEventComm::EventHeader& header) const;
+  virtual int add_dependencies (const RtecEventComm::EventHeader& header,
+                                const TAO_EC_QOS_Info &qos_info);
+
+private:
+  TAO_EC_Negation_Filter (const TAO_EC_Negation_Filter&);
+  TAO_EC_Negation_Filter& operator= (const TAO_EC_Negation_Filter&);
+
+private:
+  /// The child
+  TAO_EC_Filter* child_;
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+#endif /* TAO_EC_NEGATION_FILTER_H */