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This article compares the cataloguing code RDA: Resource Description and Access to the Anglo-American Cataloging Rules, the code that preceded RDA. It describes the main differences between both codes as well as the reasons that led to the changes. [ABSTRACT FROM AUTHOR]

The authors' intention is to support the work of indexation by librarians using concepts from a controlled vocabulary with the relationship of meanings in the descriptive cataloguing. During the course of our research, we defined the TERRIDOC thesaurus using its specifics of terms that "make sense" to the librarian when drafting the descriptive cataloguing. During the conceptualisation, the different modules were defined in order to automatically create the semantic structure representing the work of indexation experts. Then, interfaces were developed that visually represent this work in order to validate the indexation done by librarians and to navigate in the library holdings. Following the analysis and creation of this first instrument, we suggest means to control and validate the indexation. Our work is part of the field of document classification and "networked" users. [ABSTRACT FROM AUTHOR]