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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.
Pre-Coordinate Indexing Systems Pre-coordinate indexing systems are conventional systems mostly found in printed indexes. In this type of system, a document is represented in
In August 1994, eleven miners were killed in an explosion in the underground coal mine at Moura in Queensland, Australia. The mine was owned and operated by BHP Coal. A commission
General Language Dictionaries General language dictionaries are usually used for four broad purposes such as, i) a quick reference tool ii) a language standardiser ii
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Subject Dictionaries They include words, expressions, phrases, and technical terms of a particular subject: Some of these are technical and so they do not find place in g
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STANDARDS Standard relates to quality of product in use in our daily life. They cover not only house-hold goods, but the various products that we need for living in this world:
Definition and Scope of Encyclopedia The word `encyclopaedia is derived from the Greek word `enkyklios paideia' meaning 'general education'. It meant `circle of knowledge' or
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