tailieunhanh - Báo cáo khoa học: "Segregatory Coordination and Ellipsis in Text Generation"

In this paper, we provide an account of how to generate sentences with coordination constructions from clause-sized semantic representations. An algorithm is developed and various examples from linguistic literature will be used to demonstrate that the algorithm does its job well. 1 Introduction The linguistic literature has described numerous coordination phenomena (Gleitman, 1965; Ross, 1967; Neijt, 1979; Quirk et al., 1985; van Oirsouw, 1987; Steedman, 1990; Pollard and Sag, 1994; Carpenter, 1998). We will not address common problems associated with parsing, such as disambiguation and construction of syntactic structures from a string. . | Segregatory Coordination and Ellipsis in Text Generation Jeunes Shaw Dept of Computer Science Columbia University New York NY 10027 USA shaw@ Abstract In this paper we provide an account of how to generate sentences with coordination constructions from clause-sized semantic representations. An algorithm is developed and various examples from linguistic literature will be used to demonstrate that the algorithm does its job well. 1 Introduction The linguistic literature has described numerous coordination phenomena Gleitman 1965 Ross 1967 Neijt 1979 Quirk et al. 1985 van Oirsouw 1987 Steedman 1990 Pollard and Sag 1994 Carpenter 1998 . We will not address common problems associated with parsing such as disambiguation and construction of syntactic structures from a string. Instead we show how to generate sentences with complex coordinate constructions starting from semantic representations. We have divided the process of generating coordination expressions into two major tasks identifying recurring elements in the conjoined semantic structure and deleting redundant elements using syntactic information. Using this model we are able to handle coordination phenomenon uniformly including difficult cases such as non-constituent coordination. In this paper we are specifically interested in the generation of segregatory coordination constructions. In segregatory coordination the coordination of smaller units is logically equivalent to coordination of clauses for example John likes Mary and Nancy is logically equivalent to John likes Mary and John likes Nancy . Other similar conjunction coordination phenomena such as combinatory and rhetorical coordination are treated differently in text generation systems. Since these constructions cannot be analyzed as separate clauses we will define them here but will not describe them further in the paper. In combinatory coordination the sentence Mary and Nancy are sisters. is not equivalent to Mary is a sister. and Nancy is