Integration of a thesaurus and Universal Decimal Classification (UDC) to improve subject access: the Hungarian experience

The paper explores two possible solutions for integrating a thesaurus and a classification scheme, specifically UDC, in order to develop a common platform for subject information retrieval through both systems. The author reports and compares experiences from two Hungarian projects aimed at creating a complex system for combining UDC and thesauri under a homogeneous theoretical framework: MÁTrIkSz (Hungarian Comprehensive Information Retrieval Language Dictionary) and the project of thesaurus construction and implementation in the Hungarian National Library (Széchényi). The role of UDC in these two projects is analyzed with respect to the features supported, classification-based retrieval functionalities, and the perceived advantages in subject access and knowledge organization. The author explains the methodology of her research based on an examination of structured and well-documented examples and literature research into the theory of UDC and its use. The paper underlines the importance of cognition as the basis for concept-building and points out some possibilities and expedients for the integration of thesauri and the UDC