| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Concurrent Prolog | .... 3 |
| 2.1 | Syntax | .... 5 |
| 2.2 | Semantics | .... 5 |
| 3 | Object Oriented Programming in Concurrent Prolog | .... 6 |
| 3.1 | Object | .... 6 |
| 3.2 | Realization of Objects | .... 7 |
| 3.3 | The "counter" Example | .... 8 |
| 3.4 | Object-instance Creation | .... 8 |
| 3.5 | Default Programming, Filters, and Object Hierarchies | .... 10 |
| 4 | Muluti-window System | .... 15 |
| 5 | New Object-Oriented Programming Techniques in Concurrent Prolog | .... 21 |
| 5.1 | Incomplete Messages | .... 21 |
| 5.2 | Constraints | .... 24 |
| 6 | Conclusion | .... 27 |
| 7 | Acknowledgements | .... 28 |
| 8 | References | .... 29 |
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