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The data structure used to return data will be specified. This choice will most likely be determined by <br />the most appropriate method of querying the database. It is only necessary that all of requested data be <br />returned in some format that can be easily converted to the required output. Where data are not available, <br />the null indicator passed in will be used. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The cucommon DMI uses a control file to define area and time period parameters for model data. The <br />parameters are placed in a data structure and passed to a low-level DMI. The low-level DMI queries the <br />database and returns requested data to the cucommon DMI. The data are written to a formatted data file <br />used as input for the CU model. <br />4.0 DATA FLOW DIAGRAM <br />5 <br />A275 01.09.95 1.14-10 CSU IDS <br />