tailieunhanh - Báo cáo khoa học: "INFERENCING ON LINGUISTICALLY BASED STRUCTURE"

The approach is designed to achieve good, . accurate and flexible, indexing by identifying index term sources in the meaning representations built by a powerful general purpose analyser, and providing a range of text expressions constituting semantic and syntactic variants for each term concept. Indexing is seen as a legitimate form of shallow text processing, but one requiring serious semantically based language processing, particularly to obtain well-founded complex terms, which is the main objective of the project described. . | INFERENCING ON LINGUISTICALLY BASED SEMANTIC STRUCTURES Eva IlajiSovd Milena Hnátková Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Malostranskd n. 25 118 00 Praha 1 Czechoslovakia ABSTRACT The paper characterizes natural language inferencing in the TIBAQ method of question-answering focussing on three aspects i specification of the structures on which the inference rules operate ii classification of the rules that have been formulated and implemented up to now according to the kind of modification of the input structure the rules invoke and iii discussion of some points in which a properly designed inference procedure may help the searcii of the answer and vice versa. I SPECIFICATION OF THE INPUT STRUCTURES FOR INFERENCIrJG A. Outline of the TIBAO Method hhen the TIBAj text-and-inference based answering of questions project was aesigned main emphasis was laid on the automatic build-up of the stock of knowledge from the non-pre-edited input text. The experimental system based on this method converses automatically the natural language input both the questions and new pieces of information . C-ỉech sentences in their usual form into the representations of meaning tectogrammatical representations TR s these TR s serve as incut structures for the inference procedure that enriches the set of TR s selected by the systeai itself as possibly relevant for an answer to the input question. In this enriched set suitable TR s for direct and indirect answers to the given question are retrieved and then transfered by a synthesis procedure into the output surface form if sentences for an outline of tile method as such see Hajidovd 197Ộ Jajico-VỔ and Sgall 1931 Sgall 1982 . B hat Kind of structure Inferences ChouId Be Based on To decide what kind of structures the inference procedure should operate one has to take into account several criteria some of which seemingly contradict each other the structures should be as simple and .