| Abstract | .... 3 | |
| 1 | Introduction | .... 4 |
| 2 | Brief Debelopment History | .... 5 |
| 3 | The ESP Language and Its Implementation | .... 5 |
| 3.1 | Logic Programming Features | .... 5 |
| 3.2 | Object-Oriented Features | .... 6 |
| 3.3 | Implementation | .... 8 |
| 4 | ESP Features in SIMPOS | .... 9 |
| 4.1 | Unified Design Principle | .... 9 |
| 4.2 | Extended Execution Control | .... 9 |
| 4.3 | Dynamic method Search Mechanism | .... 10 |
| 4.4 | Inheritance Mechanism | .... 11 |
| 5 | Single Language Principie | .... 13 |
| 5.1 | Conformity between | .... 13 |
| 5.2 | Open System | .... 13 |
| 5.3 | Efficiency | .... 13 |
| 6 | Conclusion | .... 14 |
| Acknowledgements | .... 15 | |
| References | .... 15 |
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