| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Preliminaries amd Basic Concepts | .... 4 |
| 3 | Query Transformation | .... 6 |
| 3.1 | The Role of Query Transformations | .... 6 |
| 3.2 | Equivalent Transformations | .... 8 |
| 4 | Horn Clause Transformation by Partial Evaluation(HCT/P) | .... 9 |
| 5 | Horn Clause Transformation by Substitution(HCT/S) | .... 12 |
| 6 | Horn Clause Transformation by Restrictor(HCT/R) | .... 15 |
| 7 | A Comparison of Horn Clause Transformations | .... 21 |
| 8 | Conclusions | .... 24 |
| References | .... 25 | |
| End | .... 27 |
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