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Linear Context Free Languages
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Languages, Department of Linguistics and Philology. (Språkteknologi och datorlingvistik / NLP and Computational linguistics)
2007 (English)In: Theoretical Aspects of Computing - ICTAC 2007, Proceedings / [ed] Jones, CB; Liu, Z; Woodcock, J, 2007, 351-365 p.Conference paper (Refereed)
Abstract [en]

In this paper, I present the class of linear context free languages (LCFLs) with a class of non-deterministic one-way two-head (read only) automata, called non-deterministic linear automata (NLA). At the begining of the work of an NLA, the reading heads are installed under the opposite ends of the given input string. Then, each head can move in one direction only, the left head from left to right, while the right head from right to left. I give formal definitions of two non-deterministic versions of the linear automata, without and with e-transitions, and their corresponding computations. Deterministic linear automata model unambiguous structural analysers, while the class of the languages recognized by them does not coincide with the class of deterministic linear languages recognized by deterministic push-down machines. I compare the linear automata with other models of LCFLs. In particular, I consider a subclass of unambiguous linear context-free languages and define corresponding linear automata serving as efficient parsing tools for them, in deterministic and non-deterministic variants.

Place, publisher, year, edition, pages
2007. 351-365 p.
, Lecture Notes in Computer Science, ISSN 0302-9743 ; 4711
Keyword [en]
linear context free languages, automata, linear automata, deterministic automata, non-deterministic automata, parsing
National Category
Language Technology (Computational Linguistics)
Research subject
Mathematical Logic; Computing Science; Computational Linguistics
URN: urn:nbn:se:uu:diva-99373DOI: 10.1007/978-3-540-75292-9ISI: 000250336500024ISBN: 978-3-540-75290-5OAI: oai:DiVA.org:uu-99373DiVA: diva2:207784
4th International Colloquium on Theoretical Aspects of Computing, ICTAC 2007; Macao; 26 September 2007 through 28 September 2007
Available from: 2009-03-12 Created: 2009-03-12 Last updated: 2011-04-14Bibliographically approved

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Loukanova, Roussanka
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