diff --git a/include/ccnx-selectors.h b/include/ccnx-selectors.h
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+++ b/include/ccnx-selectors.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012-2013 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: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+#ifndef CCNX_SELECTORS_H
+#define CCNX_SELECTORS_H
+
+#include "ccnx-common.h"
+#include "ccnx-name.h"
+
+namespace Ccnx {
+
+struct InterestSelectorException:
+  virtual boost::exception, virtual exception {};
+
+class Selectors
+{
+public:
+  Selectors();
+  Selectors(const Selectors &other);
+  ~Selectors(){};
+
+  typedef enum
+  {
+    AOK_CS = 0x1,
+    AOK_NEW = 0x2,
+    AOK_DEFAULT = 0x3, // (AOK_CS | AOK_NEW)
+    AOK_STALE = 0x4,
+    AOK_EXPIRE = 0x10
+  } AOK;
+
+  typedef enum
+  {
+    LEFT = 0,
+    RIGHT = 1,
+    DEFAULT = 2
+  } CHILD_SELECTOR;
+
+  inline Selectors &
+  maxSuffixComps(int maxSCs) {m_maxSuffixComps = maxSCs; return *this;}
+
+  inline Selectors &
+  minSuffixComps(int minSCs) {m_minSuffixComps = minSCs; return *this;}
+
+  inline Selectors &
+  answerOriginKind(AOK kind) {m_answerOriginKind = kind; return *this;}
+
+  inline Selectors &
+  interestLifetime(int lifetime) {m_interestLifetime = lifetime; return *this;}
+
+  inline Selectors &
+  scope(int scope) {m_scope = scope; return *this;}
+
+  inline Selectors &
+  childSelector(CHILD_SELECTOR child) {m_childSelector = child; return *this;}
+
+  // this has no effect now
+  inline Selectors &
+  publisherPublicKeyDigest(const Bytes &digest) {m_publisherPublicKeyDigest = digest; return *this;}
+
+  CcnxCharbufPtr
+  toCcnxCharbuf() const;
+
+  bool
+  isEmpty() const;
+
+  bool
+  operator==(const Selectors &other);
+
+private:
+  int m_maxSuffixComps;
+  int m_minSuffixComps;
+  AOK m_answerOriginKind;
+  double m_interestLifetime;
+  int m_scope;
+  CHILD_SELECTOR m_childSelector;
+  // not used now
+  Bytes m_publisherPublicKeyDigest;
+};
+
+} // Ccnx
+
+#endif