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and then have low-level routines grab this information as necessary. This option is similar <br />to the previous option except that data source information is stored in an external <br />configuration file. Perhaps this option could be used in conjunction with option 2. <br />Regardless of which option is used, the ability to select a data source is important in the design of the <br />system because DMI utilities which create data for models need to be robust enough to access the <br />data whether it is in flat files or the INFORMIX database or elsewhere. Developers of these utilities <br />may not be able to wait for data to end up in its final form and destination. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />A library of low-level DMI routines has been developed in C for the CRDSS. These routines are <br />available to developers and are documented by standard UNIX man pages, as described in Task <br />Memorandum 1.05-11. Specific DMI routine functionality is specified based on the needs of <br />developers. This approach is the only cost-effective solution to providing access to the CRDSS <br />database. <br />Early development efforts have concentrated on the most important data types from the INFORMIX <br />database, e.g., time-series, because this information will need to be accessed by many CRDSS <br />applications. <br />5 <br />A275 01.08.95 1.05-8 Malers <br />