Download PDF by R. G. G. Cattell (auth.), Carole Goble, John Keane (eds.): Advances in Databases: 13th British National Conference on

By R. G. G. Cattell (auth.), Carole Goble, John Keane (eds.)

ISBN-10: 3540601007

ISBN-13: 9783540601005

This quantity provides the lawsuits of the thirteenth British nationwide convention on Databases, BNCOD thirteen, held in Manchester, united kingdom in July 1995.
The quantity comprises 2 invited contributions and 14 complete revised technical papers chosen from a complete of sixty four submissions. The papers are geared up in sections on practical databases, person interfaces, system-level algorithms, queries and transactions, and parallel and federated platforms. although BNCOD is a countrywide occasion there's powerful foreign illustration within the proceedings.

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Extra resources for Advances in Databases: 13th British National Conference on Databases, BNCOD 13 Manchester, United Kingdom, July 12–14, 1995 Proceedings

Sample text

Therefore, we perform the quantification ∃u only after adding the information about the value of u explicitly to C. Also the values yη in which u appears have to be kept in mind. We take the conjunction of the equations y = yη for all such variables y and write it as y = yη. This leads us to the following formula that takes care of the local variables in C. ∃u (u = uη ∧ y = yη ∧ C) Note that this formula depends both on u and η. So, we cannot define a dropu mapping on constraint stores alone: we have to know η as well.

W. Topor. Making Prolog more expressive. Journal of Logic Programming, 1:225–240, 1984. 12. C. S. de Boer, and A. Di Pierro. An algebraic perspective of constraint logic programming. Journal of Logic and Computation, 7, 1997. First-Order Logic as a Constraint Programming Language 33 13. V. A. Saraswat, M. Rinard, and P. Panangaden. Semantic foundations of concurrent constraint programming. In Conference Record of the Eighteenth Annual ACM Symposium on Principles of Programming Languages, pages 333–352, Orlando, Florida, 1991.

Each constant i evaluates to the element i. We then have 1. [[y = z − 1 ∧ z = x + 2]]({x/1}) = [[z = x + 2]]({x/1, y/z − 1}) = {{x/1, y/2, z/3}}, 2. [[y = 1 ∧ z = 1 ∧ y − 1 = z − 1]](ε) = {{y/1, z/1}}, 3. [[y = 1 ∧ z = 2 ∧ y < z]](ε) = {{y/1, z/2}}, 4. [[x = 0 ∧ ¬(x = 1)]](ε) = {{x/0}}, 5. [[y − 1 = z − 1 ∧ y = 1 ∧ z = 1]](ε) = {error}, First-Order Logic as a Constraint Programming Language 27 6. [[y < z ∧ y = 1 ∧ z = 2]](ε) = {error}, 7. [[¬(x = 1) ∧ x = 0]](ε) = {error}. So in this semantics the conjunction is not commutative and consequently it is important in which order the formulas are processed.

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Advances in Databases: 13th British National Conference on Databases, BNCOD 13 Manchester, United Kingdom, July 12–14, 1995 Proceedings by R. G. G. Cattell (auth.), Carole Goble, John Keane (eds.)


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