diff --git a/helper/ccnb-parser/visitors/void-visitor.h b/helper/ccnb-parser/visitors/void-visitor.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef _CCNB_PARSER_VOID_VISITOR_H_
+#define _CCNB_PARSER_VOID_VISITOR_H_
+
+#include "../common.h"
+#include <boost/any.hpp>
+
+namespace ns3 {
+namespace ndn {
+namespace CcnbParser {
+
+/**
+ * \ingroup ndn-ccnb
+ * \brief Visitor interface that takes one boost::any argument and returns nothing
+ *
+ * \see http://www.ccnx.org/releases/latest/doc/technical/BinaryEncoding.html
+ * for ccnb encoding format help
+ */
+class VoidVisitor
+{
+public:
+  virtual void visit (Blob&,  boost::any)=0; ///< \brief Method accepting BLOB block  
+  virtual void visit (Udata&, boost::any)=0; ///< \brief Method accepting UDATA block 
+  virtual void visit (Tag&,   boost::any)=0; ///< \brief Method accepting TAG block   
+  virtual void visit (Attr&,  boost::any)=0; ///< \brief Method accepting ATTR block  
+  virtual void visit (Dtag&,  boost::any)=0; ///< \brief Method accepting DTAG block  
+  virtual void visit (Dattr&, boost::any)=0; ///< \brief Method accepting DATTR block 
+  virtual void visit (Ext&,   boost::any)=0; ///< \brief Method accepting EXT block
+
+  virtual ~VoidVisitor () { }
+};
+
+}
+}
+}
+
+#endif // _CCNB_PARSER_VOID_VISITOR_H_