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Index term

index terms, index term period
An index term, subject term, subject heading, or descriptor, in information retrieval, is a term that captures the essence of the topic of a document Index terms make up a controlled vocabulary for use in bibliographic records They are an integral part of bibliographic control, which is the function by which libraries collect, organize and disseminate documents They are used as keywords to retrieve documents in an information system, for instance, a catalog or a search engine A popular form of keywords on the web are tags which are directly visible and can be assigned by non-experts Index terms can consist of a word, phrase, or alphanumerical term They are created by analyzing the document either manually with subject indexing or automatically with automatic indexing or more sophisticated methods of keyword extraction Index terms can either come from a controlled vocabulary or be freely assigned

Keywords are stored in a search index Common words like articles a, an, the and conjunctions and, or, but are not treated as keywords because it's inefficient Almost every English-language site on the Internet has the article "the", and so it makes no sense to search for it The most popular search engine, Google removed stop words such as "the" and "a" from its indexes for several years, but then re-introduced them, making certain types of precise search possible again

The term "descriptor" was coined by Calvin Mooers in 1948 It is in particular used about a preferred term from a thesaurus

The Simple Knowledge Organization System language SKOS provides a way to express index terms with Resource Description Framework for use in the context of Semantic Web


  • 1 In web search engines
  • 2 Author keywords
  • 3 Examples
  • 4 See also
  • 5 References

In web search engines

Most web search engines are designed to search for words anywhere in a document—the title, the body, and so on This being the case, a keyword can be any term that exists within the document However, priority is given to words that occur in the title, words that recur numerous times, and words that are explicitly assigned as keywords within the coding Index terms can be further refined using Boolean operators such as "AND, OR, NOT" "AND" is normally unnecessary as most search engines infer it "OR" will search for results with one search term or another, or both "NOT" eliminates a word or phrase from the search, getting rid of any results that include it Multiple words can also be enclosed in quotation marks to turn the individual index terms into a specific index phrase These modifiers and methods all help to refine search terms, to better maximize the accuracy of search results

Author keywords

Many journals and databases provides access also to index terms made by authors to the articles being published or represented The relative quality of indexer-provided index terms and author provided index terms is of interest to research in information retrieval The quality of both kinds of indexing terms depends, of course, on the qualifications of provider In general authors have difficulties providing indexing terms that characterizes his document relative to the other documents in the database Author keywords are an integral part of literature


  • Canadian Subject Headings CSH
  • Library of Congress Subject Headings LCSH
  • Medical Subject Headings MeSH
  • Polythematic Structured Subject Heading System PSH
  • Subject Headings Authority File SWD

See also

  • Dynamic keyword insertion
  • Tag cloud
  • Keyword density
  • Search engine optimization
  • Tag metadata
  • Subject documents


  1. ^ a b Svenonius, Elaine 2009 The intellectual foundation of information organization 1st MIT Press pbk ed Cambridge, Mass: MIT Press ISBN 9780262512619 
  2. ^ Cutts, Matt 2010, March 4 How search works Retrieved from https://wwwyoutubecom/watchv=BNHR6IQJGZs
  3. ^ CLIO Keyword search Columbia University Libraries Retrieved from http://wwwcolumbiaedu/cu/lweb/help/clio/keywordhtml

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