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diff --git a/pjlib/include/pj/guid.h b/pjlib/include/pj/guid.h
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+/* $Id: guid.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * 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 __PJ_GUID_H__
+#define __PJ_GUID_H__
+
+
+/**
+ * @file guid.h
+ * @brief GUID Globally Unique Identifier.
+ */
+#include <pj/types.h>
+
+
+PJ_BEGIN_DECL
+
+
+/**
+ * @defgroup PJ_DS Data Structure.
+ */
+/**
+ * @defgroup PJ_GUID Globally Unique Identifier
+ * @ingroup PJ_DS
+ * @{
+ *
+ * This module provides API to create string that is globally unique.
+ * If application doesn't require that strong requirement, it can just
+ * use #pj_create_random_string() instead.
+ */
+
+
+/**
+ * PJ_GUID_STRING_LENGTH specifies length of GUID string. The value is
+ * dependent on the algorithm used internally to generate the GUID string.
+ * If real GUID generator is used, then the length will be between 32 and
+ * 36 bytes. Application should not assume which algorithm will
+ * be used by GUID generator.
+ *
+ * Regardless of the actual length of the GUID, it will not exceed
+ * PJ_GUID_MAX_LENGTH characters.
+ *
+ * @see pj_GUID_STRING_LENGTH()
+ * @see PJ_GUID_MAX_LENGTH
+ */
+PJ_DECL_DATA(const unsigned) PJ_GUID_STRING_LENGTH;
+
+/**
+ * Get #PJ_GUID_STRING_LENGTH constant.
+ */
+PJ_DECL(unsigned) pj_GUID_STRING_LENGTH(void);
+
+/**
+ * PJ_GUID_MAX_LENGTH specifies the maximum length of GUID string,
+ * regardless of which algorithm to use.
+ */
+#define PJ_GUID_MAX_LENGTH  36
+
+/**
+ * Create a globally unique string, which length is PJ_GUID_STRING_LENGTH
+ * characters. Caller is responsible for preallocating the storage used
+ * in the string.
+ *
+ * @param str       The string to store the result.
+ *
+ * @return          The string.
+ */
+PJ_DECL(pj_str_t*) pj_generate_unique_string(pj_str_t *str);
+
+/**
+ * Generate a unique string.
+ *
+ * @param pool	    Pool to allocate memory from.
+ * @param str	    The string.
+ */
+PJ_DECL(void) pj_create_unique_string(pj_pool_t *pool, pj_str_t *str);
+
+
+/**
+ * @}
+ */
+
+PJ_END_DECL
+
+#endif/* __PJ_GUID_H__ */
+