tailieunhanh - Báo cáo khoa học: "Information Structure in Topological Dependency Grammar"

Topological Dependency Grammar (TDG) is a lexicalized dependency grammar formalism, able to model languages with a relatively free word order. In such languages, word order variation often has an important function: the realization of information structure. The paper discusses how to integrate information structure into TDG, and presents a constraint-based approach to modelling information structure and the various means to realize it, focusing on (possibly simultaneous use of) word order and tune. . | Information Structure in Topological Dependency Grammar Geert-Jan Kruijff Computational Linguistics Saarland University Saarbriicken Germany gj@ Denys Duchier INRIA Lorraine Nancy France . fr Abstract Topological Dependency Grammar TDG is a lexicalized dependency grammar formalism able to model languages with a relatively free word order. In such languages word order variation often has an important function the realization of information structure. The paper discusses how to integrate information structure into TDG and presents a constraint-based approach to modelling information structure and the various means to realize it focusing on possibly simultaneous use of word order and tune. 1 Introduction In this paper we present an extension to Topological Dependency Grammar Duchier and Debus-mann 2001 enabling US to analyse . word order variation and tune as means to indicate what is the topic and what is the focus of an expression - . its information structure cf. 2 4 . Using a constraint-based approach we can analyse the surface form of an expression in terms of the information structure that it realizes. The information structure of an expression is a core part of its meaning it indicates how the expression relates to the discourse context. Information structure thus constitutes a crucial factor in determining an expression s contextual appropriateness or interpretability. Particularly in applications that involve human-computer interaction information structure has thus been found to have a great impact on the understandability of computergenerated language . question answering dia logues Prevost and Steedman 1994 Hoffman 1995 Kruijff-Korbayova et al. 2003 or generation Kruijff-Korbayova et al. 2002 . In this paper we concentrate on information structure and the syntax semantics-interface We want to be able to reconstruct an expression s information structure at the level of meaning given the expression s surface form. .