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The article focuses on the main innovations and lines of action by ICCU on the authority headings in the SBN Opac, which open new perspectives on data integration. This work gives an account of the qualitative review activities carried out by the Working Group for the management and maintenance of the Authority File of SBN, the updates of SBN's authority headings rules among with their recent opening the Opac, the creation of redirects for merged headings, the implementation of LOD and API, and the innovations brought by the Alphabetica portal. These novelties will be followed closely by further advances that will be characterizing Index 3. [ABSTRACT FROM AUTHOR]

The article focuses on subject indexing in the National Library Service (Servizio Bibliotecario Nazionale -- SBN), specifically analyzing the historical premises and the diachronic developments that marked its evolution. In particular, it traces the origin and growth of the archive of subjects and classes in the SBN Index (and the collective SBN catalogue) from the founding years of the SBN cooperative bibliographic network up to the most recent transformations coming from the "Evolution of the SBN Index" project. This paper also takes into consideration the observations of the ICCU-BNCF joint working group which worked on the application of the Nuovo soggettario in SBN from 2009 up to 2010 and analyzes the project for implementation of the archive of subjects and classes of the SBN Index (2016-2017). Some considerations are proposed concerning the subject links to the Work record, thus suggesting the apical grouping by subject, which is also based on the new conceptual model IFLA Library Reference Model (LRM). [ABSTRACT FROM AUTHOR]