diff --git a/src/lp/field.hpp b/src/lp/field.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#ifndef NDN_CXX_LP_FIELD_HPP
+#define NDN_CXX_LP_FIELD_HPP
+
+#include "../common.hpp"
+#include "../encoding/encoding-buffer.hpp"
+
+#include <boost/type_traits.hpp>
+
+namespace ndn {
+namespace lp {
+
+/**
+ * \brief indicates where a field may occur
+ */
+namespace field_location_tags {
+
+class Base
+{
+};
+
+/**
+ * \brief a header field
+ */
+class Header : public Base
+{
+};
+
+/**
+ * \brief the Fragment field
+ */
+class Fragment : public Base
+{
+};
+
+} // namespace field_location_tags
+
+/**
+ * \brief concept check for fields
+ */
+template<class X>
+struct Field
+{
+  BOOST_CONCEPT_ASSERT((boost::is_base_of<field_location_tags::Base, typename X::FieldLocation>));
+  BOOST_CONCEPT_ASSERT((boost::DefaultConstructible<typename X::ValueType>));
+  BOOST_CONCEPT_ASSERT((boost::CopyConstructible<typename X::ValueType>));
+  BOOST_CONCEPT_ASSERT((boost::is_same<typename X::TlvType::value_type, uint64_t>));
+  BOOST_CONCEPT_ASSERT((boost::is_same<typename X::IsRepeatable::value_type, bool>));
+  BOOST_CONCEPT_USAGE(Field)
+  {
+    Block wire;
+    X j;
+    typename X::ValueType decoded = j.decode(wire);
+    EncodingBuffer enc;
+    j.encode(enc, decoded);
+  }
+};
+
+} // namespace lp
+} // namespace ndn
+
+#endif // NDN_CXX_LP_FIELD_HPP
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