The two most common types of subject authorities are the thesaurus and the subject heading list. A true thesaurus, in the realm of information science, is a comprehensive controlled vocabulary of discrete unit terms, called descriptors, arranged is such a way as to display the hierarchical and associative relationships among terms. It is usually limited to a particular realm of knowledge, as in the case of the Art and Architecture Thesaurus. The American national standards for thesauri are spelled out in the NISO Guidelines for the Construction, Format, and Management of Monolingual Thesauri. A subject heading list, such as the Sears List or the Library of Congress Subject Headings, is simply an alphabetical list of terms that been established over time as warranted by the materials being cataloged. A subject heading list also indicates relationships among terms but does not attempt to establish any comprehensive hierarchies. In addition to simple descriptors, a subject heading list can include pre-coordinated strings composed of subject terms with subdivisions.
The two most common types of subject authorities are the thesaurus and the subject heading list. A true thesaurus, in the realm of information science, is a comprehensive controlled vocabulary of discrete unit terms, called descriptors, arranged is such a way as to display the hierarchical and associative relationships among terms. It is usually limited to a particular realm of knowledge, as in the case of the Art and Architecture Thesaurus. The American national standards for thesauri are spelled out in the NISO Guidelines for the Construction, Format, and Management of Monolingual Thesauri. A subject heading list, such as the Sears List or the Library of Congress Subject Headings, is simply an alphabetical list of terms that been established over time as warranted by the materials being cataloged. A subject heading list also indicates relationships among terms but does not attempt to establish any comprehensive hierarchies. In addition to simple descriptors, a subject heading list can include pre-coordinated strings composed of subject terms with subdivisions.
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