First step of refactoring code (ccnx prefix => ndn prefix)
diff --git a/model/ndn.h b/model/ndn.h
new file mode 100644
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--- /dev/null
+++ b/model/ndn.h
@@ -0,0 +1,152 @@
+/* -*- 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 _NDN_H_
+#define _NDN_H_
+
+#include "ns3/object.h"
+#include "ns3/callback.h"
+#include "ns3/traced-callback.h"
+
+namespace ns3 {
+
+class Node;
+class NetDevice;
+class Packet;
+class NdnForwardingStrategy;
+class NdnFace;
+class NdnContentObjectHeader;
+class NdnInterestHeader;
+class NdnPit;
+
+/// @cond include_hidden
+/**
+ * \internal
+ * \brief Private namespace for Ndn content store implementation
+ */
+namespace __ndn_private
+{
+class i_face {};
+class i_metric {};
+class i_nth {};
+class i_prefix {};
+class i_ordered {}; ///< tag for Boost.MultiIndex container (ordered by prefix)
+class i_mru {};
+}
+/// @endcond
+
+// default data size
+// #define NDN_DEFAULT_DATA_SIZE 1024
+// #define NDN_INTEREST_RESET_PERIOD (10*MILLI_SECOND)
+
+/**
+ * \defgroup ndn NDN abstraction
+ *
+ * This is an abstract implementation of NDN protocol
+ */
+/**
+ * \ingroup ndn
+ * \brief Interface to manage Ndn stack
+ *
+ * This class defines the API to manipulate the following aspects of
+ * the Ndn stack implementation:
+ * -# register a face (NdnFace-derived object) for use by the Ndn
+ * layer
+ * -# register forwarding strategy (NdnForwardingStrategy-derived
+ * object) to use by Ndn stack
+ * -# export Ndn configuration attributes
+ *
+ * Each NdnFace-derived object has conceptually a single Ndn
+ * interface associated with it.
+ *
+ * In addition, this class defines Ndn packet coding constants
+ *
+ * \see NdnFace, NdnForwardingStrategy
+ */
+class Ndn : public Object
+{
+public:
+ /**
+ * \brief Interface ID
+ *
+ * \return interface ID
+ */
+ static TypeId GetTypeId ();
+ virtual ~Ndn ();
+
+ /**
+ * \brief Add face to Ndn stack
+ *
+ * \param face smart pointer to NdnFace-derived object
+ * (NdnLocalFace, NdnNetDeviceFace, NdnUdpFace) \returns the
+ * index of the Ndn interface added.
+ *
+ * \see NdnLocalFace, NdnNetDeviceFace, NdnUdpFace
+ */
+ virtual uint32_t
+ AddFace (const Ptr<NdnFace> &face) = 0;
+
+ /**
+ * \brief Get current number of faces added to Ndn stack
+ *
+ * \returns the number of faces
+ */
+ virtual uint32_t
+ GetNFaces (void) const = 0;
+
+ /**
+ * \brief Get face by face index
+ * \param face The face number of an Ndn interface.
+ * \returns The NdnFace associated with the Ndn face number.
+ */
+ virtual Ptr<NdnFace>
+ GetFace (uint32_t face) const = 0;
+
+ /**
+ * \brief Remove face from ndn stack (remove callbacks)
+ */
+ virtual void
+ RemoveFace (Ptr<NdnFace> face) = 0;
+
+ /**
+ * \brief Get face for NetDevice
+ */
+ virtual Ptr<NdnFace>
+ GetFaceByNetDevice (Ptr<NetDevice> netDevice) const = 0;
+
+ // /**
+ // * \enum DropReason
+ // * \brief A reason why the packet has been dropped
+ // */
+ // enum DropReason
+ // {
+ // DUPLICATED, // Interests
+ // SUPPRESSED, // Interests and Nacks
+ // NO_FACES, // Interests
+ // NON_DUPLICATED, // Nacks
+ // AFTER_SATISFIED, // Nacks
+ // UNSOLICITED, // data
+ // PIT_LIMIT // PIT limit reached
+ // };
+ };
+
+} // namespace ns3
+
+#endif /* _NDN_H_ */