Keyphrases
- tree grammars
- finite state automata
- tree structure
- natural language
- tree structures
- finite automata
- context free grammars
- grammatical inference
- index structure
- r tree
- finite state machines
- data mining
- hierarchical structure
- parse tree
- artificial intelligence
- context free
- tree construction
- information retrieval
- tree nodes
- visual languages
- machine learning