tailieunhanh - Báo cáo khoa học: "PRIORITY UNION AND GENERALIZATION IN DISCOURSE GRAMMARS"

We describe an implementation in Carpenter's typed feature formalism, ALE, of a discourse gramm a r of the kind proposed by Scha, Polanyi, et al. We examine their method for resolving parallelism-dependent anaphora and show that there is a coherent feature-structural rendition of this type of grammar which uses the operations of prwrity union and generalization. We describe an augmentation of the ALE system to encompass these operations and we show that an appropriate choice of definition for priority union gives the desired multiple output for examples of vP-ellipsis which exhibit a strict/sloppy ambiguity. . | PRIORITY UNION AND GENERALIZATION IN DISCOURSE GRAMMARS Claire Grover Chris Brew Suresh Manandhar Marc Moens HCRC Language Technology Group The University of Edinburgh 2 Buccleuch Place Edinburgh EH8 9LW UK Internet Abstract We describe an implementation in Carpenter s typed feature formalism ALE of a discourse grammar of the kind proposed by Scha Polanyi et al. We examine their method for resolving parallelism-dependent anaphora and show that there is a coherent feature-structural rendition of this type of grammar which uses the operations of priority union and generalization. We describe an augmentation of the ALE system to encompass these operations and we show that an appropriate choice of definition for priority union gives the desired multiple output for examples of vp-ellipsis which exhibit a strict sloppy ambiguity. 1 Discourse Grammar Working broadly within the sign-based paradigm exemplified by HPSG Pollard and Sag in press we have been exploring computational issues for a discourse level grammar by using the ALE system Carpenter 1993 to implement a discourse grammar. Our central model of a discourse grammar is the Linguistic Discourse Model ldm most often associated with Scha Polanyi and their coworkers Polanyi and Scha 1984 Scha and Polanyi 1988 Priist 1992 and most recently in Priist Scha and van den Berg 1994 . In LDM rules are defined which are in a broad sense unification grammar rules and which combine discourse constituent units dcus . These are simple clauses whose syntax and underresolved semantics have been determined by a sentence grammar but whose fully resolved final form can only be calculated by their integration into the current discourse and its context. The rules of the discourse grammar act to establish the rhetorical relations between constituents and to perform resolution of those anaphors whose interpretation can be seen as a function of discourse coherence as opposed to those whose interpretation relies on general

• Báo cáo khoa học
• PRIORITY UNION
• GENERALIZATION
• DISCOURSE GRAMMARS
• báo cáo khoa học
• mô hình ngôn ngữ
• xử lý ngôn ngữ tự nhiên
• Bài giảng Xử lý ngôn ngữ tự nhiên
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• Nhập nhằng cấu trúc
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• Mô hình n gram
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