Abstract
Is addresses the context in which it has produced the review of the thesaurus concept like prototypic documentary language. The context is determined by the Taxonomies revalorization, the apparition of the Ontologies like KOS; and the evolution of the own thesauri to his conceptual enrichment and his transformation in semantic networks. It attends also to the new model of visualization and conceptual representation contributed by the Topic maps, as well as to importance achieved by the Folksonomies to reinterpret the key-words system. Finally, it describes an experience of update course given jointly to librarians of the DT/SIBi-USP and to students of the PPGCI/ECA.
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