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Implicit predicates for handling disjunctive fuzzy information in fuzzy databases

There are two aspects of uncertainty: vagueness and ambiguity. This paper proposes IP (Implicit Predicate) to support both vagueness and ambiguity in fuzzy databases by allowing disjunctive fuzzy information. IP is basically a descriptor dedicated to an unknown value which turns out to be ambiguous as well as vague in nature. In this paper we demonstrate that IP is a promising construct which can not only deal with disjunctive fuzzy information, but also make a sophisticated concept‐based match possible by coupling thesauri with fuzzy databases. We also propose a query evaluation mechanism to derive exact answers from the disjunctive fuzzy information by fully exploiting IPs. © 2002 Wiley Periodicals, Inc.