Transition network grammars for natural language analysis
Communications of the ACM
The Theory and Practice of Augmented Transition Network Grammars
Natural Language Communication with Computers
Natural Language Communication with Computers
Augmented phrase structure grammars
TINLAP '75 Proceedings of the 1975 workshop on Theoretical issues in natural language processing
Language As a Cognitive Process: Syntax
Language As a Cognitive Process: Syntax
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Logic based programming systems have enjoyed an increasing popularity in applied AI work in the last few years. One of the contributions to Computational Linguistics made by the Logic Programming Paradigm has been the Definite Clause Grammar. In comparing DCG's with previous parsing mechanisms such as ATN's, certain clear advantages are seen. We feel that the most important of these advantages are due to the use of Logical Variables with Unification as the fundamental operation on them. To illustrate the power of the Logical Variable, we have implemented an experimental ATN system which treats ATN registers as Logical Variables and provides a unification operation over them. We would like to simultaneously encourage the use of the powerful mechanisms available in DCG's, and demonstrate that some of these techniques can be captured without reference to a resolution theorem prover.