Fig. 3

Flow chart of the database operation – registration of a data file loaded. When a file is loaded to jMRUI, the hash sum of the file content is computed. The database searches for the hash sum of the given file in the FILES table; if it is found, the database returns the corresponding file identification number from the ID_ file column, otherwise a new entry in the table FILES is created and the new ID_file is returned. If more files were loaded, this procedure is repeated for all selected files. All values from ID_ file column are stored in the “OPEN FILES” registry and will be kept there until the data file is saved or removed from the jMRUI processing mode. A new entry with “LOAD_FILE” value is added to the column action of the table ACTIONS