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Graphics Interchange Format  |  1996-07-01  |  48.8 KB  |  451x323  |  4-bit (16 colors)
   ocr: CONCERTUAL SCHEMA (DataModel INTERNAL EXTERNAL SCHEMA SCHEMA 1 (Table Detinilions) INTERNAL SCHEMA EXTERNAL (Flles) SCHEMA 2 EXTERNAL SCHEMA 3 FIGURE 1. The conceptital schema adrift.