| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Partially Tagged Trees | .... 5 |
| 2.1 | Partially Specified Terms | .... 8 |
| 3 | Theory of Partial Equations | .... 8 |
| 3.1 | Axioms of Partial Equations ε: | .... 8 |
| 3.2 | Solving Partial Equations | .... 9 |
| 3.3 | Satisfiability | .... 10 |
| 4 | Program over Record Algebra | .... 12 |
| 5 | Extended Definite Clause Grammar | .... 15 |
| 5.1 | Extended PTTs | .... 15 |
| 5.2 | Extended Term | .... 15 |
| 5.3 | Extended DCG | .... 15 |
| Acknowledgements | .... 16 | |
| References | .... 16 | |
| End | .... 17 |
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