This article describes how the n‐Cube expert system development tool can assist in item classification using the Universal Decimal Classification (UDC) standard. The n‐Cube makes use of a tree classification structure with associated rules and default inheritance features. Any information known about a particular classification is a combination of the defaults known about that class, as well as the defaults associated with any of its parent classes. As a result, many of the problems associated with simple rule‐based systems are overcome.
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