tailieunhanh - Báo cáo khoa học: "Morphonology in the Lexicon"

In this paper we present a means of defining morphonological phenomena in an inheritance based lexicon. We make use of the theory behind the formal language MOLUSC, in which morphological alternations were defined as mappings between sequences of tree-structured syllables. We discuss how the alternations can be defined in the inheritance-based lexical representation language DATR, and how the phonological aspects can be built upon to bring it closer to an integrated lexicon with representations which can be used by both the morphology and phonology of a language. . | Morphonology in the Lexicon Lynne J Cahill School of Cognitive and Computing Sciences University of Sussex Brighton BN1 9QH England Email lynneca@ Abstract In this paper we present a means of defining morphonological phenomena in an inheritance based lexicon. We make use of the theory behind the formal language MOLUSC in which morphological alternations were defined as mappings between sequences of tree-structured syllables. We discuss how the alternations can be defined in the inheritance-based lexical representation language DATR and how the phonological aspects can be built upon to bring it closer to an integrated lexicon with representations which can be used by both the morphology and phonology of a language. 1 Introduction The use of inheritance mechanisms in computational linguistics has become wide-ranging with applications in semantics syntax morphology and phonology. In this paper we shall examine the applicability of such mechanisms to phonological aspects of morphology. The inheritance-based lexical representation language DATR has become widely used for various aspects of linguistic description and previous treatments of both morphological and phonological phenomena in DATR have shown its applicability to this area both for its handling of inheritance by default and for its ability to define hierarchical structures. For example Gibbon 1990 describes how Kikuyu tone displacement and Arabic non-concatenative morphology can be defined in Thanks are due to Roger Evans and Dafydd Gibbon for comments on previous drafts of this paper. DATR and Reinhard 1990 describes a hierarchical approach to German umlaut. In this paper we assume a knowledge of DATR and refer the reader to the introductions in Cahill and Evans 1990 and Evans and Gazdar 1990 . MOLUSC Cahill 1990a Cahill 1990b Cahill and Gazdar 1990 is a formal language for defining morphological alternations as mappings between sequences of tree-structured syllables. It is based on the theory

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