The main object of the paper is to demonstrate in detail the role ofclassification in information retrieval (IR) and the design of classificatorystructures by the application of logical division to all forms of the contentof records, subject and imaginative. The natural product of such divisionis a faceted classification. The latter is seen not as a particular kind of libraryclassification but the only viable form enabling the locating and relatingof information to be optimally predictable. A detailed exposition ofthe practical steps in facet analysis is given, drawing on the experience ofthe new Bliss Classification (BC2). The continued existence of the libraryas a highly organized information store is assumed. But, it is argued, it mustacknowledge the relevance of the revolution in library classification that hastaken place. It considers also how alphabetically arranged subject indexesmay utilize controlled use of categorical (generically inclusive) and syntacticrelations to produce similarly predictable locating and relating systemsfor IR.
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