Keyphrases
- context free grammars
- grammatical inference
- context free languages
- syntactic pattern recognition
- context free
- regular expressions
- attribute grammars
- regular languages
- production rules
- xml schema
- np complete
- predicate invention
- grammar induction
- formal languages
- np hard
- computational complexity
- closure properties
- covering arrays
- lexical semantics
- tree automata
- rough sets
- neural network