| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Parallel Prolog and Concurrent Prolog | .... 4 |
| 3 | Abstract Machine Architecture | .... 7 |
| 4 | Variables and Their Representation | .... 10 |
| 5 | Primitives for Parallel Prolog | .... 14 |
| 5.1 | Basic Unification Primitive Operators | .... 14 |
| 5.2 | Some Examples of Head Unification | .... 19 |
| 5.3 | Nondeterministic Merge Primitives | .... 23 |
| 5.4 | Execution of and Literals | .... 26 |
| 6 | Primitives for Concurrent Prolog | .... 31 |
| 6.1 | Raed-only Annotation | .... 31 |
| 6.2 | Guard operation mechanism | .... 32 |
| 7 | Conclusion | .... 33 |
| Acknowledgement | .... 34 | |
| Reference | .... 34 | |
| End | .... 36 |
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