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The paper presents the state of elaboration of the natural language information retrieval system DIALOG. Its aim is an automatic, conversational extraction of facts from a given text. Actually it is real medical text on gastroenterology, which was prepared by a team of specialists. The system has a modular structure. The first, and in fact very important module is the language analysis module. Its task is to ensure the transition of a medical text from its natural form, i.e. rentences formed by physicians, into a formal ~ogical notation. . | NATURAL LANGUAGE INFORMATION RETRIEVAL SYSTEM DIALOG L. Bole K. Kochut A. Lesniewski T. Strzalkowski Warsaw University Institute of Informatics PKiN pok.850 00-901 Warszawa POLAND ABSTRACT Presented paper contains a description of an experimental version of the natural language information retrieval system DIALOG. The system Is destined for the use in the field of medicine. Its main purpose is to ensure access to information to phisicians in a conversational manner. The use of the system does not require ability of programming from its user. 1Introduction The paper presents the state of elaboration of the natural language information retrieval system DIALOG. Its aim is an automatic conversational extraction of facts from a given text. Actually it is real medical text on gastroenterology which was prepared by a team of specialists. The system has a modular structure. The first and in fact very important module is the language analysis module. Its task is to ensure the transition of a medical text from its natural form i.e. sentences formed by physicians into a formal logical notation. This logical notation i.e. logical formulae is rather universal and can be easy adapted to various deductive and knowledge representation methods. The program of the analyser was written with the use of the CATN Cascaded ATN technique where the syntactic and semantic components constitute separate cascades. In the deduction and knowledge representation module the weak second order language was used. The works by E.Konrad Konrad 76 and N.Klein Klein 78 from the Technical University in Berlin were 1 Presently Universitat Stuttgart Institute fur Informatic Herdeweg 51 Raum 4 Postfach 560.7000 Stuttgart FRG 2 Presently Simon Fraser University Dept of Computing Sci. Burnaby B.c. Canada the starting point in the elaboration of this module. Presented version of the system was implemented on the IBM 370 computer VM 370 operating system . . 2. Transformation of natural language sentences into .
