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diff --git a/src/lookup/lookup.h b/src/lookup/lookup.h
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+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2006-2007 Peng Wu
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  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
+ */
+
+#ifndef LOOKUP_H
+#define LOOKUP_H
+
+/** @file lookup.h
+ *  @brief the definitions of common lookup related classes and structs.
+ */
+
+typedef phrase_token_t lookup_key_t;
+
+struct lookup_value_t{
+    /* previous and current tokens of the node */
+    phrase_token_t m_handles[2];
+    /* maximum possibility of current node  */
+    gfloat m_poss;
+    /* trace back information for final step */
+    gint32 m_last_step;
+
+    lookup_value_t(gfloat poss = FLT_MAX){
+	m_handles[0] = null_token; m_handles[1] = null_token;
+	m_poss = poss;
+	m_last_step = -1;
+    }
+};
+
+#endif