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Library classification
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<p>A library classification is a system used within a <a href="/facts/Library/hvdQNTtS">library</a> to organize materials, including books, sound and video recordings, electronic materials, etc., both on shelves and in catalogs and indexes. Each item is typically assigned a call number, which identifies the location of the item within the system. Materials can be arranged by many different factors, typically in either a hierarchical tree structure based on the subject or using a <a href="/facts/Faceted_classification/4jNTPVMC">faceted classification</a> system, which allows the assignment of multiple classifications to an object, enabling the classifications to be ordered in many ways. </p>