| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Architecture | .... 3 |
| 2.1 | Fundamental Design Decisions | .... 3 |
| 2.2 | Internal Schema | .... 5 |
| 2.3 | Architecture of Delta | .... 7 |
| 3 | Functions | .... 10 |
| 3.1 | Database Accses Functions | .... 11 |
| 3.2 | Database Contorols | .... 12 |
| 3.3 | System Supervising | .... 15 |
| 4 | Basic Processing Algorithms | .... 16 |
| 4.1 | Retrieval | .... 16 |
| 4.2 | Updating | .... 20 |
| 5 | Implementation | .... 21 |
| 6 | Conclusions | .... 24 |
| Acknowledgements | .... 25 | |
| References | .... 25 | |
| End | .... 26 |
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