| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Classification of Literals | .... 3 |
| 2.1 | Equivalence Relation between Literals | .... 3 |
| 2.2 | Choice of Representative | .... 4 |
| 3 | Program Transformation using Representatives | .... 6 |
| 3.1 | Representative Program | .... 6 |
| 3.2 | Program Transformation in Multiple Worlds | .... 7 |
| 3.3 | Semantics of Representative Program | .... 9 |
| 3.4 | Program Optimization | .... 11 |
| 4 | Query Processing in Representative Program | .... 12 |
| 5 | Concluding Remarks | .... 16 |
| Acknowledgments | .... 16 | |
| References | .... 16 |
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