A system for obtaining target data from a conventional computer database in response to an input query which has at least one attribute includes a Type Abstraction Hierarchy (TAH) manager for providing a TAH structure including relaxation conditions for said at least one attribute. A control unit successively...http://www.google.nl/patents/US5956707?utm_source=gb-gplus-sharePatent US5956707 - Database system with query relaxation using type abstraction hierarchy (TAH) as query condition relaxation structure
Database system with query relaxation using type abstraction hierarchy (TAH ...
