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diff --git a/gps/core/observer/IDataItemObserver.h b/gps/core/observer/IDataItemObserver.h
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+/* Copyright (c) 2015, 2017 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __IDATAITEMOBSERVER_H__
+#define __IDATAITEMOBSERVER_H__
+
+#include  <list>
+#include <string>
+
+using namespace std;
+
+namespace loc_core
+{
+class IDataItemCore;
+
+/**
+ * @brief IDataItemObserver interface
+ * @details IDataItemObserver interface;
+ *          In OS dependent code this type serves as a handle to an OS independent instance of this interface.
+ */
+class IDataItemObserver {
+
+public:
+
+    /**
+     * @brief Gets name of Data Item Observer
+     * @details Gets name of Data Item Observer
+     *
+     * @param name reference to name of Data Item Observer
+     */
+    virtual void getName (string & name) = 0;
+
+    /**
+     * @brief Notify updated values of Data Items
+     * @details Notifys updated values of Data items
+     *
+     * @param dlist List of updated data items
+     */
+    virtual void notify (const std :: list <IDataItemCore *> & dlist)  = 0;
+
+    /**
+     * @brief Destructor
+     * @details Destructor
+     */
+    virtual ~IDataItemObserver () {}
+};
+
+} // namespace loc_core
+
+#endif // #ifndef __IDATAITEMOBSERVER_H__