diff --git a/helper/ccnb-parser/visitors/depth-first-visitor.h b/helper/ccnb-parser/visitors/depth-first-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_DEPTH_FIRST_VISITOR_H_
+#define _CCNB_PARSER_DEPTH_FIRST_VISITOR_H_
+
+#include "visitor.h"
+
+namespace ns3 {
+namespace ndn {
+namespace CcnbParser {
+
+/**
+ * \ingroup ccnx-ccnb
+ * \brief Depth-first visitor that takes boot::any as argument and returns boost::any value
+ */
+class DepthFirstVisitor : public Visitor
+{
+public:
+  virtual boost::any visit (Blob&,  boost::any);
+  virtual boost::any visit (Udata&, boost::any);
+  virtual boost::any visit (Tag&,   boost::any);
+  virtual boost::any visit (Attr&,  boost::any);
+  virtual boost::any visit (Dtag&,  boost::any);
+  virtual boost::any visit (Dattr&, boost::any);
+  virtual boost::any visit (Ext&,   boost::any);
+};
+
+}
+}
+}
+
+#endif // _CCNB_PARSER_DEPTH_FIRST_VISITOR_H_