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Thesaurus in Post-Coordinate Indexing Systems
Thesaurus has come into existence as a tool for vocabulary control in post-coordinated indexing system. It helps the indexer in selecting the appropriate terms for indexing, as the indexer may not be familiar with the subject field. It also aids the indexer in his choice of search terms, especially in searching a field with which he is not intimately familiar.
Besides providing alternative search paths, a thesaurus aids in choosing terms for summation. When information on all the aspects of a subject field is required, search has to be made covering all the related aspects. Here the searcher may not be able to recall all the information that the system can gave without the aid of a thesaurus. In the case of computer searching, the links between words used in documents and words used as descriptors in indexing are assembled via a thesaurus.
POST-COORDINATE INDEXING MODEL All the pre-coordinate indexing models discussed so far are of unidimensional in nature based on the order of significance. The significance or
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