Natural Language Engineering 10 (1): 57–89. c 2004 Cambridge University Press 57 DOI: 10.1017/S1351324903003279 Printed in the United Kingdom Mood and modality: out of theory and into the fray MARJORIE MCSHANE, SERGEI NIRENBURG Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA e-mail: {marge,sergei}@umbc.edu RON ZACHARSKI New Mexico State University, Box 3000/MSC 3CRL, Las Cruces, NM 88003-8001, USA e-mail:
[email protected] (Received 10 September 2002; revised 14 March 2003 ) Abstract The topic of mood and modality (MOD) is a difficult aspect of language description because, among other reasons, the inventory of modal meanings is not stable across languages, moods do not map neatly from one language to another, modality may be realised morphologically or by free-standing words, and modality interacts in complex ways with other modules of the grammar, like tense and aspect. Describing MOD is especially difficult if one attempts to develop a unified approach that not only provides cross-linguistic coverage, but is also useful in practical natural language processing systems. This article discusses an approach to MOD that was developed for and implemented in the Boas Knowledge-Elicitation (KE) system. Boas elicits knowledge about any language, L, from an informant who need not be a trained linguist. That knowledge then serves as the static resources for an L-to-English translation system. The KE methodology used throughout Boas is driven by a resident inventory of parameters, value sets, and means of their realisation for a wide range of language phenomena.