A chain is a string of terms organized in a particular sequence based on the classification scheme that the chain adapts. The sequence of terms ispre-coordinated. Ranganathan is credited with the invention of chain indexing, an economical system of providing access to the terms in classification schedules without replicating the hierarchical structure of the classification in the alphabetical index.
Chain indexing was used, for example, in the British National Bibliography (BNB) in the 1950s and 1960s until they were replaced by PRECIS-indexing.
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Last edited: 12-05-2007