A grammar-driven knowledge acquisition tool that incorporates constraint propagation

摘要

To acquire knowledge that is fit for a specific purpose, it is very desirable to have a structured, declarative expression of the knowledge that is needed. This paper introduces a stand-alone knowledge acquisition tool, called COCKATOO (Constraint-Capable Knowledge Acquisition Tool), which uses constraint technology to specify the knowledge it requires. The language in which these specifications are given is based on the meta-language notation of context-free grammars. However, we also took the opportunity to build a tool that is both more flexible and powerful by augmenting context-free grammars with the expressiveness of constraints. COCKATOO was implemented using the SCREAMER+ declarative constraints package.