Index term

Source: Wikipedia, the free encyclopedia.

In

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

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 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 the Semantic Web.[1]

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.[2] 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.[3]

Author keywords

Author keywords are an integral part of literature.[1] Many journals and databases provide access to index terms made by authors of the respective articles. How qualified the provider is decides the quality of both indexer-provided index terms and author-provided index terms. The quality of these two types of index terms is of research interest, particularly in relation to information retrieval. In general, an author will have difficulty providing indexing terms that characterize his or her document relative to other documents in the database.

Examples

See also

References

  1. ^
    ISBN 9780262512619
    .
  2. ^ Cutts, Matt. (2010, March 4). How search works. Retrieved from https://www.youtube.com/watch?v=BNHR6IQJGZs
  3. ^ CLIO. Keyword search. Columbia University Libraries. Retrieved from http://www.columbia.edu/cu/lweb/help/clio/keyword.html

Further reading

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