| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Restricted Least Fixed Points | .... 5 |
| 3 | Decomposition of Restrictors | .... 11 |
| 4 | Query Processing Strategines | .... 18 |
| 4.1 | Class r | .... 19 |
| 4.2 | Class O*(r) | .... 20 |
| 4.3 | Class Op(r) | .... 23 |
| 4.4 | Class transformation | .... 25 |
| 5 | Conclusions | .... 27 |
| References | .... 27 | |
| End | .... 30 |
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