Keyphrases
- context free grammars
- grammatical inference
- context free languages
- syntactic pattern recognition
- context free
- xml schema
- covering arrays
- attribute grammars
- predicate invention
- regular expressions
- production rules
- tree automata
- grammar induction
- regular languages
- definite clause
- lexical semantics
- higher order
- artificial intelligence
- control system
- database systems