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Nowadays almost everybody has a mobile phone. However, these phones are not only used for phoning, but also offer other possibilities, for example showing WAP or WEB pages, and even a library catalogue. Although being far more intelligent than their predecessors, these devices have their limitations, such as the small size and the numeric only keyboard. Therefore any system made accessible by mobile devices should be simple and functional, providing essential information only. The article introduces an experimental pocket OPAC system. The first part of the article outlines the steps of planning and the structure of the system. The second part describes the system in working. Finally the article gives a summary of the experiences of developing the system and an outlook for possible applications.
Card catalogues have been replaced by automated catalogues in the library world. The data that earlier figured on card catalogue records, including UDC numbers, together form the database records. The use of UDC can be difficult because in order to determine the meaning of a number, we have to look up its natural language definition in the tables. Synonyms - terms having identical meanings but different forms - need to be related. Homonyms - terms having different meanings but identical form - need to be separated. With the creation of cross references it would be possible to avoid ambiguity in information retrieval languages as well as to keep track of the changes made in UDC numbers.
The paper examines the problem of the computer-based searchability of databases containing both catalogue records and full-text documents. The question arises whether such old and prestigious classification systems as the Universal Decimal Classification should still remain in use in the age of ontologies, machine translation and natural-language context analysis? At the current level of the development of information technologies, the answer is: yes. The next question is, how can good quality controlled and natural-language search tools co-operate in the same search system? The first part of the paper presents the UDC system, as the most popular classification system also used in the countries of Central Europe. The following chapters deal with the differences between free text search solutions and search tools based on classification categories. The application of both types of searches in the same system means a great challenge for librarians. The paper offers one practical solution in the context of the ALEPH 500 integrated library system, a newly created search tool at the National Technical Information Centre and Library (BME OMIKK), operating at Budapest University of Technology and Economics.
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