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diff --git a/src/persistence_client_library_tree_helper.h b/src/persistence_client_library_tree_helper.h
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+++ b/src/persistence_client_library_tree_helper.h
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+#ifndef PERSISTENCE_CLIENT_LIBRARY_TREE_HELPER_H
+#define PERSISTENCE_CLIENT_LIBRARY_TREE_HELPER_H
+
+/******************************************************************************
+ * Project         Persistency
+ * (c) copyright   2015
+ * Company         XS Embedded GmbH
+ *****************************************************************************/
+/******************************************************************************
+ * This Source Code Form is subject to the terms of the
+ * Mozilla Public License, v. 2.0. If a  copy of the MPL was not distributed
+ * with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+******************************************************************************/
+ /**
+ * @file           persistence_client_library_tree_helper.h
+ * @ingroup        Persistence client library
+ * @author         Ingo Huerner
+ * @brief          Header of persistence client library tree helper functions
+ * @see
+ */
+
+
+#include<stdio.h>
+#include<stdlib.h>
+
+#include "persistence_client_library_handle.h"
+#include "rbtree.h"
+
+
+/// tree to store key handle information
+extern jsw_rbtree_t *gKeyHandleTree;
+
+/// tree to store file handle information
+extern jsw_rbtree_t *gFileHandleTree;
+
+/// tree to store OSS file handle information
+extern jsw_rbtree_t *gOssFileHandleTree;
+
+
+/// key handle data union definition
+typedef union KeyHandleData_u_
+{
+   /// key handle data definition
+   PersistenceKeyHandle_s keyHandle;
+
+   /// key handle data payload
+   char payload[sizeof(struct _PersistenceKeyHandle_s)];
+
+} KeyHandleData_u;
+
+/// type definition of a key tree item
+typedef struct _KeyHandleTreeItem_s
+{
+   /// key handle key
+   int key;
+
+   /// key handle data
+   KeyHandleData_u value;
+
+} KeyHandleTreeItem_s;
+
+
+
+/// file handle data union definition
+typedef union FileHandleData_u_
+{
+   /// file handle data definition
+   PersistenceFileHandle_s fileHandle;
+
+   /// file handle data payload
+   char payload[sizeof(struct _PersistenceFileHandle_s)];
+
+} FileHandleData_u;
+
+/// type definition of a file tree item
+typedef struct _FileHandleTreeItem_s
+{
+   /// file handle key
+   int key;
+
+   /// file handle data
+   FileHandleData_u value;
+
+} FileHandleTreeItem_s;
+
+
+
+/**
+ * @brief Compare function for file handle tree item
+ *
+ * @param p1 pointer to the first item to compare
+ * @param p2 pointer to the second item to compare
+ *
+ * @return 0 if key is equal; -1 if p1 < p2; 1 if p1 > p2
+ */
+int fh_key_val_cmp(const void *p1, const void *p2 );
+
+
+/**
+ * @brief Duplicate function for file handle tree item
+ *
+ * @param p the pointer of the item to duplicate
+ *
+ * @return pointer to the duplicated item, on failure NULL
+ */
+void* fh_key_val_dup(void *p);
+
+/**
+ * @brief Release function for file handle tree item
+ *
+ * @param p pointer tp the item to release
+ */
+void  fh_key_val_rel(void *p );
+
+
+
+/**
+ * @brief Compare function for key handle tree item
+ *
+ * @param p1 pointer to the first item to compare
+ * @param p2 pointer to the second item to compare
+ *
+ * @return 0 if key is equal; -1 if p1 < p2; 1 if p1 > p2
+ */
+int kh_key_val_cmp(const void *p1, const void *p2 );
+
+/**
+ * @brief Duplicate function for key handle tree item
+ *
+ * @param p the pointer of the item to duplicate
+ *
+ * @return pointer to the duplicated item, on failure NULL
+ */
+void* kh_key_val_dup(void *p);
+
+/**
+ * @brief Release function for key handle tree item
+ *
+ * @param p pointer tp the item to release
+ */
+void  kh_key_val_rel(void *p );
+
+
+
+#endif /* PERSISTENCE_CLIENT_LIBRARY_TREE_HELPER_H */