I titoli uniformi negli archivi di autorità di sistemi UNIMARC in colloquio con Indice, con particolare riferimento ad ALEPH 500

The Italian cataloguing code (Regole italiane di catalogazione, REICAT) requires the identification of all the works represented in the catalogue by the use of uniform titles. In the SBN-MARC protocol of the Italian National Library Service network (SBN), the authority records for the uniform titles have a different structure from the one proposed by the UNIMARC Authorities format: this prevents the respect of the cataloguing rules, the correct indexing of works and expressions and consequently their effective retrieval and display in the OPACs. This paper illustrates the problems and the possible solutions, both in the SBN-MARC protocol and in the UNIMARC systems that are hubs linked to SBN Index system, the core of the collective catalogue.