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, . rentences formed by physicians, into a formal ~ogical notation. .
