TAILIEUCHUNG - Báo cáo khoa học: "DEFAULTS IN UNIFICATION GRAMMAR"

The second reason is t h a t t h e u s e o f d e f a u l t s simplifies the development of large a n d complex grammars, in particular, the development of lexicons for s u c h g r a m m a r s (Evans & G a z d a r 1988). The latter suggests t h a t the use of defaults Is of p a r t i c u l a r r e l e v a n c e for t h o s. | Defaults IN UNIFICATION Grammar Gosse Bouma Research Institute for Knowledge Systems Postbus 463 6200 AL Maastricht The Netherlands e-mail gosse ABSTRACT Incorporation of defaults In grammar formalisms Is important for reasons of linguistic adequacy and grammar organization. In this paper we present an algorithm for handling default Information In unification grammar. The algorithm specifies a logical operation on feature structures merging with the non-default structure only those parts of the default feature structure which are not constrained by the non-default structure. We present various linguistic applications of default unification. L INTRODUCTION Motivation. There a two not quite unrelated reasons for Incorporating defaults mechanisms Into a linguistic formalism. First linguists have often argued that certain phenomena are described most naturally with the use of rules or other formal devices that make use of a notion of default see for Instance Gazdar 1987 . The second reason Is that the use of defaults simplifies the development of large and complex grammars. In particular the development of lexiconsfor such grammars Evans Gazdar 1988 . The latter suggests that the use of defaults Is of particular relevance for those brands of Unification Grammar UG that are lexicalist that is. In which the lexicon is the main source of grammatical Information such as Categorial Unification Grammar Uskorelt 1986 Calder et al. 1988 and Head-driven Phrase structure Grammar Pollard Sag 1987 . We propose a method for Incorporating defaults into UG in such a way that It both extends the linguistic adequacy of ƯG and supports the formulation of rules templates and lexical entries for many unification-based theories. In the next section we define default unification a logical operation on feature structures. It is defined for a language FML which Is In many respects Identical to the language FML as defined tn Kasper Rounds 1986 7 Next we come to linguistic .

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