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Theory and Practice of Constraint Handling Rules (1998)
| Citations: | 455 - 37 self |
BibTeX
@MISC{Frühwirth98theoryand,
author = {Thom Frühwirth},
title = {Theory and Practice of Constraint Handling Rules},
year = {1998}
}
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Abstract
Constraint Handling Rules (CHR) are our proposal to allow more flexibility and application-oriented customization of constraint systems. CHR are a declarative language extension especially designed for writing user-defined constraints. CHR are essentially a committed-choice language consisting of multi-headed guarded rules that rewrite constraints into simpler ones until they are solved. In this broad survey we aim at covering all aspects of CHR as they currently present themselves. Going from theory to practice, we will define syntax and semantics for CHR, introduce an important decidable property, confluence, of CHR programs and define a tight integration of CHR with constraint logic programming languages. This survey then describes implementations of the language before we review several constraint solvers - both traditional and non- standard ones - written in the CHR language. Finally we introduce two innovative applications that benefited from using CHR.
Keyphrases
constraint handling rule application-oriented customization tight integration multi-headed guarded rule user-defined constraint committed-choice language constraint logic programming language broad survey several constraint solver important decidable property innovative application constraint system chr language non standard one simpler one declarative language extension chr program rewrite constraint
