tailieunhanh - Báo cáo khoa học: "SYSTEMIC GRAMMAR IN COMPUTATION: THE NIGEL CASE"

Computational linguistics needs grammars for several different tasks such as comprehension of text, machine translation, and text generation. 1 Clearly, any approach to grammar 2 has large computational systemic grammar for text generation (Nigel) that is currently being developed. | SYSTEMIC GRAMMAR IN COMPUTATION THE NIGEL CASE Christian . Matthiessen usc lnformation Sciences Institute 1 INTRODUCTION Computational linguistics needs grammars for several different tasks such as comprehension of text machine translation and text Clearly any approach to grammar2 has potentially something to offer computational linguistics say for parsing or text generation and. by the same token there is a potential benefit from an application within computational linguistics for each approach cf. Fawcett 80 . However it is equally clear that some approaches have much more to offer than others. Here I will take a look at Systemic Linguistics3 in the service of computational linguistics tasks concentrating on a 1This research was supported by the Air Force Office of Scientific Research Contract No. F49620-79-C-0181. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements either expressed or implied of the Air Force Office of Scientific Research of the . Government. I am very grateful to William Mann for many helpful comments on various versions of this paper much of the discussion builds on work by him. I am also deeply indebted to Michael . Halliday I have profited from and drawn heavily on his insights about English grammar and semantics and the systemic framework. I am solely responsible for all errors. 2_. .______ . . There are now in the early 80s a great number of grammatical mechanisms around -- witness for example the 1979 Milwaukee conference on current alternative approaches to syntax where around fourteen alternatives were presented see Moravcsik Wirth 80 . a collection which is only a sample leaving out many current approaches. The term grammar is used in its traditional sense in systemic linguistics it subsumes both syntax and morphology. This use contrasts with the more recent one where grammar subsumes .