@inproceedings{468a08d029864cab9bbb98ffd6e13612,
title = "Knowledge-directed query processing in expert database systems",
abstract = "The quality of an answer to a database query can be enhanced by utilizing semantic knowledge such that an expert would use if he/she were to answer the query. A system capable of utilizing such expert knowledge in a deductive database paradigm is presented. A given query is reformulated to reduce the cost of evaluation, to generate a subset of answers in the shortest amount of time, and/or to generate the set of good answers. Semantic knowledge is represented by a set of Horn clauses where a number of special predicates are used. The situations in which certain knowledge becomes relevant to a query are defined, and a method of identifying these situations is given. The authors present the ways in which semantic knowledge can be used and a backtracking scheme for inaccurate knowledge.",
author = "Lee, {Sang goo} and Henschen, {Lawrence Joseph} and Qadah, {Ghassan Z.}",
year = "1990",
language = "English (US)",
isbn = "0818620846",
series = "Proc 2 Int IEEE Conf Tools Artif Intell",
publisher = "Publ by IEEE",
pages = "640--646",
booktitle = "Proc 2 Int IEEE Conf Tools Artif Intell",
note = "Proceedings of the 2nd International IEEE Conference on Tools for Artificial Intelligence ; Conference date: 06-11-1990 Through 09-11-1990",
}