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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 also. 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 is inefficient to do so. 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 Organisation System language (SKOS) provides a way to express index terms with Resource Description Framework for use in the context of Semantic Web. ==In Digital Search Engines== Most digital 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.〔Cutts, Matt. (2010, March 4). ''How search works.'' Retrieved from https://www.youtube.com/watch?v=BNHR6IQJGZs〕 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.〔CLIO. ''Keyword search''. Columbia University Libraries. Retrieved from http://www.columbia.edu/cu/lweb/help/clio/keyword.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Index term」の詳細全文を読む スポンサード リンク
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