Keyphrases
- context free grammars
- grammatical inference
- context free languages
- regular expressions
- context free
- predicate invention
- syntactic pattern recognition
- covering arrays
- formal languages
- tree adjoining
- regular languages
- query language
- neural network
- tree automata
- xml schema
- knowledge acquisition
- higher order
- attribute grammars
- closure properties
- expert systems
- databases