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Access to the continuously revised vocabulary is now available via subscription and free services. Subject headings are normally applied to every item within a library's collection and facilitate a user's access to items in the catalog that pertain to similar subject matter, in order to save time finding items of related subject matter.
Faceted Application of Subject Terminology (FAST) is a general use controlled vocabulary based on the Library of Congress Subject Headings (LCSH). [1] FAST is developed as a part of WorldCat by OCLC , Inc., with the goal of making subject cataloging less costly and easier to implement in online contexts.
Controlled vocabulary terms can accurately describe what a given document is actually about, even if the terms themselves do not occur within the document's text. Well known subject heading systems include the Library of Congress system, Medical Subject Headings (MeSH) created by the United States National Library of Medicine, and Sears.
In information retrieval, an index term (also known as subject term, subject heading, descriptor, or keyword) 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 .
SCIS catalogues bibliographic and audio-visual resources, both physical and digital, including trade fiction and non-fiction and educational materials. SCIS metadata includes full and abridged Dewey Decimal Classification, subject headings from SCISSHL and the linked-data Schools Online Thesaurus, and name and series authorities maintained by SCIS.
Unlike subject heading or thesauri where multiple terms can be assigned to the same work, in library classification systems, each work can only be placed in one class. This is due to shelving purposes: A book can have only one physical place. However, in classified catalogs one may have main entries as well as added entries.
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In information science, authority control is a process that organizes information, for example in library catalogs, [1] [2] [3] by using a single, distinct spelling of a name (heading) or an (generally alphanumeric) identifier for each topic or concept.