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Definition
There are a number of definitions of 'thesaurus' provided by different experts and organisations. The most comprehensive one has been provided by the International Standards Organisation (ISO) as the basis of structure and functions of a thesaurus. In terms of functions, it states "a thesaurus is a terminological control device used in translating from the natural language of documents, indexers or users into a more constrained 'system language' (documentation language, information language)". In terms of structure, the Standard says, "a thesaurus is a controlled and dynamic vocabulary of semantically and generically related terms which covers a specific domain of knowledge".
In short, a thesaurus may be defined as a compilation of descriptors for use in an information retrieval system arranged in an alphabetical order and manifesting the various types of relationships existing between the descriptors. An information retrieval thesaurus is a kind of semantic networking of concepts.
DOCUMENTARY REFERENCE TOOLS/SOURCES Various types of documentary reference tools (usually referred to as reference books) have been identified: Dictionaries Encyclop
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Entry Vocabulary and Index Vocabulary Terms linked by equivalence relationships are rather different from those in the other two groups (hierarchical and associative relation
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SUBJECT AUTHORITY FILE Meaning Most libraries maintain a subject authority file consisting of subject authority records in order to ensure uniformity and consistency
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Types of State of the Art Reports The state-of-the-art reports can be grouped into three categories (for the sake of convenience). Reviews and Surveys; Advances and
Evaluation of Encyclopaedias A good and useful collection of general and special encyclopaedias form the backbone for the reference work in any library. The strong collectio
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