Keyphrases
- context free grammars
- context free languages
- grammatical inference
- normal form
- context free
- visual languages
- real time
- syntactic pattern recognition
- natural language
- hierarchical structure
- finite state automata
- hierarchically organized
- tree grammars
- production rules
- grammar induction
- xml schema
- tree structure
- bayesian networks
- artificial intelligence
- database
- tree adjoining