Keyphrases
- data structure
- context free grammars
- grammatical inference
- visual languages
- syntactic pattern recognition
- natural language
- finite state automata
- databases
- tree grammars
- tree structure
- grammar rules
- grammar induction
- context free languages
- data mining
- mildly context sensitive
- natural language processing
- information extraction
- case study
- search engine
- tree bank
- data sets