diff --git a/src/link.hpp b/src/link.hpp
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+++ b/src/link.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_LINK_HPP
+#define NDN_LINK_HPP
+
+#include "data.hpp"
+#include <set>
+
+namespace ndn {
+
+const size_t INVALID_SELECTED_DELEGATION_INDEX = std::numeric_limits<size_t>::max();
+
+/** @brief represents a Link instance
+ */
+class Link : public Data
+{
+public:
+  class Error : public Data::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : Data::Error(what)
+    {
+    }
+  };
+
+  // The ordering is based on the preference number and needs to be preserved
+  typedef std::set<std::pair<uint32_t, Name>> DelegationSet;
+
+  /**
+   * @brief Create an empty Link object
+   *
+   * Note that in certain contexts that use Link::shared_from_this(), Link must be
+   * created using `make_shared`:
+   *
+   *     shared_ptr<Link> linkObject = make_shared<Link>();
+   *
+   * Otherwise, Link::shared_from_this() will throw std::bad_weak_ptr.
+   */
+  Link() = default;
+
+  /**
+   * @brief Create a Link object from a Block
+   *
+   * Note that in certain contexts that use Link::shared_from_this(), Link must be
+   * created using `make_shared`:
+   *
+   *     shared_ptr<Link> linkObject = make_shared<Link>(block);
+   *
+   * Otherwise, Link::shared_from_this() will throw std::bad_weak_ptr.
+   */
+  explicit
+  Link(const Block& block);
+
+  /**
+   * @brief Create a Link object with the given name
+   *
+   * @param name A reference to the name of the redirected namespace
+   *
+   * Note that in certain contexts that use Link::shared_from_this(), Link must be
+   * created using `make_shared`:
+   *
+   *     shared_ptr<Link> link = make_shared<Link>(name);
+   *
+   * Otherwise, Link::shared_from_this() will throw std::bad_weak_ptr.
+   */
+  explicit
+  Link(const Name& name);
+
+ /**
+   * @brief Create a Link object with the given name and pairs of <Preference, Name>
+   *
+   * @param name A reference to the name of the redirected namespace
+   * @param links A reference to the list of pairs of the redirected namespace
+   * along with its priority
+   *
+   * Note that in certain contexts that use Link::shared_from_this(), Link must be
+   * created using `make_shared`:
+   *
+   *     shared_ptr<Link> link = make_shared<Link>(name, links);
+   *
+   * Otherwise, Link::shared_from_this() will throw std::bad_weak_ptr.
+   */
+  Link(const Name& name, std::initializer_list<std::pair<uint32_t, Name>> links);
+
+  /**
+   * @brief Add a delegation in the format of <Name, Preference>
+   * @param preference The preference of the delegation to be added
+   * @param name The name of the delegation to be added
+   * @note If a delegation with @p name exists, its preference will be updated
+   */
+  void
+  addDelegation(uint32_t preference, const Name& name);
+
+  /**
+   * @brief Remove a delegation whose name is @p name
+   * @param name The name of the delegation to be removed
+   * @return true if delegation is removed, otherwise false
+   */
+  bool
+  removeDelegation(const Name& name);
+
+  /**
+   * @brief Get the pairs of <Name, Preference>
+   * @return a set of delegations
+   */
+  const DelegationSet&
+  getDelegations() const;
+
+  /**
+   * @brief Decode from the wire format
+   */
+  void
+  wireDecode(const Block& wire);
+
+protected:
+  /** \brief prepend Link object as a Content block to the encoder
+   *
+   *  The outermost Content element is not part of Link object structure.
+   */
+  template<encoding::Tag TAG>
+  size_t
+  encodeContent(EncodingImpl<TAG>& encoder) const;
+
+  void
+  encodeContent();
+
+  void
+  decodeContent();
+
+private:
+  bool
+  removeDelegationNoEncode(const Name& name);
+
+private:
+  DelegationSet m_delegations;
+};
+
+} // namespace ndn
+
+#endif // NDN_LINK_HPP