tailieunhanh - Báo cáo khoa học: "Syntactic and Semantic Transfer with F-Structures*"

We present two approaches for syntactic and semantic transfer based on LFG f-structures and compare the results with existing co-description and restriction operator based approaches, focusing on aspects of ambiguity preserving transfer, complex cases of syntactic structural mismatches as well as on modularity and reusability. The two transfer approaches are interfaced with an existing, implemented transfer component (Verbmobi1), by translating f-structures into a term language, and by interfacing fstructure representations with an existing semantic based transfer approach, respectively. . | Syntactic and Semantic Transfer with F-Structures Michael Dorna Anette Frank Josef van Genabith and Martin c. Emele IMS Universităt Stuttgart Azenbergstr. 12 D-70174 Stuttgart dorna emele Xerox Research Centre Europe 6 chemin de Maupertuis F-38240 Meylan Anette. FrankfSxrce. xerox. com Dublin City University Computer Applications Dublin 9 Ireland Abstract We present two approaches for syntactic and semantic transfer based on LFG f-structures and compare the results with existing co-description and restriction operator based approaches focusing on aspects of ambiguity preserving transfer complex cases of syntactic structural mismatches as well as on modularity and reusability. The two transfer approaches are interfaced with an existing implemented transfer component Verbmobiỉ by translating f-structures into a term language and by interfacing f-structure representations with an existing semantic based transfer approach respectively. 1 Introduction Target and source levels of representation in transfer-based machine translation MT are subject to often competing demands on the one hand they need to abstract away from particulars of language specific surface realization to ensure that transfer is as simple and straightforward as possible. On the other hand they need to encode sufficiently fine-grained information to steer transfer. Furthermore target and source representations should be linguistically well established and motivated levels of representation. Finally from a computational perspective they need to be sensible representations for both parsing and generation. LFG f-structures are abstract high-level syntactic representations which go some way towards meeting these often irreconcilable requirements. We would like to thank H. Kamp M. Schiehlen and the anonymous reviewers for helpful comments on earlier versions of this article. Part of this work was funded by the German Federal Ministry of Education Science Research .