tailieunhanh - Báo cáo khoa học: "On the notion of uniqueness"

In the paper it is argued that for some linguistic phenomena, current discourse representation structures are insufficiently finegrained, both from the perspective of serving as representation in NLP and from a truth conditional perspective. One such semantic phenomenon is uniqueness. It is demonstrated that certain elements are forced to have a unique interpretation, from a certain point in discourse onwards. This could be viewed as the semantic counterpart of surface order. Although it has always been acknowledged that the left-toright order of constituents influences the meaning of an utterance, it is, for example, not reflected in standard Discourse Representation. | On the notion of uniqueness Joke Dorrepaal Onderzoeksinstituut voor Taal en Spraak 3512 JK Utrecht The Netherlands Email Abstract In the paper it is argued that for some linguistic phenomena current discourse representation structures are insufficiently finegrained both from the perspective of serving as representation in NLP and from a truth conditional perspective. One such semantic phenomenon is uniqueness. It is demonstrated that certain elements are forced to have a unique interpretation from a certain point in discourse onwards. This could be viewed as the semantic counterpart of surface order. Although it has always been acknowledged that the left-to-right order of constituents influences the meaning of an utterance it is for example not reflected in standard Discourse Representation Theory Kamp 1981 . In the paper an alternative representation for unique constituents will be proposed resulting in asymmetry of certain conjoined conditions in a DRS-representation. Introduction Logic-based discourse theories are in many respects not sufficiently fine-grained. This becomes particularly obvious when we consider adopting such a representation as an interface in an NLP system. Suppose we have a discourse as in 1 and assign it a DRT-like representation as in 2 The research reported here was supported by LRE project 061-62 Towards a Declarative Theory of Discourse sponsored by the European Community and by Eurotra sponsored by the EC and the NBBI . 1 John owns two talking parrots. Anne feeds them. 2 x y z John x Anne y parrot z Z 2 ii owns x z talk Z feed y Z When we take take this representation as a starting point for generation we end up with at least the following discourses 3 a John owns two talking parrots. Anne feeds them. b Anne feeds two parrots which talk. John owns them. c There are two parrots. They talk. John owns them and Anne feeds them. d John owns two parrots which talk. Anne feeds them. e John owns two parrots that talk. .

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