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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.
How to Use a Thesaurus The final process of indexing involves translating the relevant subject concepts of the document into the indexing language or the descriptor language
Controlled Indexing Language In the foregoing paragraphs we have discussed the concept of an indexing language as also, the categories into which it falls. In the process, we
PRE-COORDINATE INDEXING MODELS You will recall from your study of the sub-section 14.5.2 of Unit 14 that the pre-coordinate index constitutes a collection of index entries in
Meaning A vocabulary control device depends on a master list of terms that can be assigned to documents. Such a master list of terms is called 'List of Subject Headings'. A l
Multilingual Dictionaries The second type useful for translation are known as multilingual or polyglot dictionaries. They provide similar words in three or more languages
Classify one emerging technology and evaluate its future prospects by identifying the cultural and social factors that may prevent or promote its successful application. Use concr
Coverage by Kind of Documents I & A periodicals are also devoted to specific kinds of documents such as periodical articles, patents, theses, conference proceedings, translati
DOCUMENTARY REFERENCE TOOLS/SOURCES Various types of documentary reference tools (usually referred to as reference books) have been identified: Dictionaries Encyclop
In terms of technological but also social development, what do you think was the significance of the Bronze Age?
Comprehensive Services Centralised agencies in countries such as the former USSR, France, Japan and China have been attempting comprehensive I & A services to cover all types
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