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Left-To-Right Parsing and Bilexical Context-Free Grammars

Mark-Jan Nederhof; Giorgio Satta
In: Sergei Nirenburg; Douglas Appelt; Fabio Ciravegna; Robert Dale (Hrsg.). Proceedings of the 6th Applied Natural Language Processing Conference and 1st Meeting of the North American Chapter of the Association for Computational Linguistics (ANLP-NAACL'00), April 29 - May 3. Applied Natural Language Processing Conference (ANLP), Seattle, Washington, USA, Pages 272-279, 2000.


We compare the asymptotic time complexity of left-to-right and bidirectional parsing techniques for bilexical context-free grammars, a grammar formalism that is an abstraction of language models used in several state-of-the-art real-world parsers. We provide evidence that left-to-right parsing cannot be realised within acceptable time-bounds if the so called correct-prefix property is to be ensured. Our evidence is based on complexity results for the representation of regular languages.

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