tailieunhanh - Báo cáo khoa học: "The Semantics of Resource Sharing in Lexical-Functional Grammar"

We argue that the resource sharing that is commonly manifest in semantic accounts of coordination is instead appropriately handled in terms of structure-sharing in LFG f-structures. We provide an extension to the previous account of LFG semantics (Dalrymple et al., 1993a) according to which dependencies between f-structures are viewed as resources; as a result a one-to-one correspondence between uses of f-structures and meanings is maintained. | The Semantics of Resource Sharing in Lexical-Functional Grammar Andrew Kehler Aiken Computation Lab 33 Oxford Street Harvard University Cambridge MA 02138 Mary Dalrymple John Lamping Vijay SaraswaU Xerox PARC 3333 Coyote Hill Road Palo Alto CA 94304 Abstract We argue that the resource sharing that is commonly manifest in semantic accounts of coordination is instead appropriately handled in terms of structure-sharing in LFG f-structures. We provide an extension to the previous account of LFG semantics Dalrymple et al. 1993a according to which dependencies between f-structures are viewed as resources as a result a one-to-one correspondence between uses of f-structures and meanings is maintained. The resulting system is sufficiently restricted in cases where other approaches overgenerate the very property of resourcesensitivity for which resource sharing appears to be problematic actually provides explanatory advantages over systems that more freely replicate resources during derivation. 1 Introduction The resource-based approach to semantic composition in Lexical-Functional Grammar LFG obtains the interpretation for a phrase via a logical deduction beginning with the interpretations of its parts as premises Dalrymple et al. 1993a . The resource-sensitive system of linear logic is used to compute meanings in accordance with relationships manifest in LFG f-structures. The properties of the system ensure that meanings are used exactly once allowing coherence and completeness conditions on f-structures Kaplan and Bresnan 1982 pages 211-212 to be maintained. However there are cases where a single constituent appears to yield more than one contribution to the meaning of an utterance. This is most dalrymple lamping saraswat Oparc. xerox. com obvious in but is not limited to sentences involving coordination. In example 1 for instance. NAFTA is the object of two different verbs 1 Bill supported and Hillary opposed NAFTA. Since the hallmark of the linear

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