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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
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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
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Author keywords are an integral part of literature. 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
71:, 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
63:, 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
90:(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 "
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such as "the" and "a" from its indexes for several years, but then re-introduced them, making certain types of precise search possible again.
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or more sophisticated methods of keyword extraction. Index terms can either come from a controlled vocabulary or be freely assigned.
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150:. These modifiers and methods all help to refine search terms, to better maximize the accuracy of search results.
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163:. In general, an author will have difficulty providing indexing terms that characterize his or her document
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51:) is a term that captures the essence of the topic of a document. Index terms make up a
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types of index terms is of research interest, particularly in relation to
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as keywords within the coding. Index terms can be further refined using
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263:(1st MIT Press pbk. ed.). Cambridge, Massachusetts: MIT Press.
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in 1948. It is in particular used about a preferred term from a
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marks to turn the individual index terms into a specific index
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language (SKOS) provides a way to express index terms with
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The intellectual foundation of information organization
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http://www.columbia.edu/cu/lweb/help/clio/keyword.html
303:. Columbia University Libraries. Retrieved from
195:Polythematic Structured Subject Heading System
67:. A popular form of keywords on the web are
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289:https://www.youtube.com/watch?v=BNHR6IQJGZs
326:Library Resources & Technical Services
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183:Library of Congress Subject Headings
167:to other documents in the database.
118:Simple Knowledge Organization System
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357:Information retrieval techniques
201:Subject Headings Authority File
59:. They are an integral part of
283:Cutts, Matt. (2010, March 4).
124:for use in the context of the
122:Resource Description Framework
105:The term "descriptor" was by
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322:"Birth of a Subject Heading"
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177:Canadian Subject Headings
82:Keywords are stored in a
320:Ferris, Anna M. (2018).
189:Medical Subject Headings
75:or automatically with
161:information retrieval
132:In web search engines
61:bibliographic control
57:bibliographic records
53:controlled vocabulary
29:information retrieval
339:10.5860/lrts.62n1.16
86:. Common words like
224:Subject (documents)
214:Index (publishing)
138:web search engines
77:automatic indexing
285:How search works.
257:Svenonius, Elaine
143:Boolean operators
16:(Redirected from
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332:(1): 16–27.
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126:Semantic Web
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37:subject term
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55:for use in
351:Categories
240:References
100:stop words
45:descriptor
33:index term
234:Tag cloud
111:thesaurus
362:Thesauri
259:(2009).
208:See also
171:Examples
165:relative
98:removed
88:articles
49:keyword
299:CLIO.
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191:(MeSH)
185:(LCSH)
148:phrase
96:Google
203:(SWD)
197:(PSH)
136:Most
47:, or
31:, an
265:ISBN
179:(CS)
116:The
69:tags
334:doi
92:the
27:In
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