The Call Numbers

      

[ Example of the Call Number ]

          A library classification is a system of documents, library materials or any information (books, serials, audiovisual materials, computer files, maps, manuscripts, realia) according to their subject and allocating a call number  to that information resource. Bibliographic classification systems group entities together that are relevant the same subject, typically arranged in a hierarchical tree structure (like classification systems used in biology). A different kind of classification system, called a faceted classification system, is also widely used which allows the assignment of multiple classifications to an object, enabling the classifications to be ordered in multiple ways.