BLCMP has been providing a computerised cataloguing service for nearly 20 years. Over the last five years the emphasis of its activities has been towards the implementation of an integrated stand alone library system, BLS. The OPAC (Online Public Access Catalogue) module of BLS has recently undergone extensive development with the introduction of author and keyword search facilities. Features of the OPAC described in the paper include parameterisation for flexibility in screen design, novice and expert searching, the first and current (Revision 1) versions and future developments. Finally, the close working relationship between BLCMP and the library school at the City of Birmingham Polytechnic is described.
The second major revision of the OPAC module of BLS (the BLCMP stand‐alone library system) allows libraries to offer users different views of the catalogue files. Record selection software allows sub‐set catalogues to be constructed according to library defined criteria, such as subject, physical format, location or language of publication. These views of the catalogue can then be offered to users of OPAC, where the record retrieval and display facilities have been enhanced to allow each view to be optimised according to its contents; for instance individual libraries can now define various algorithms for the generation of suitable acronym keys for particular sub‐set catalogues.
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