Keyphrases
- context free grammars
- grammatical inference
- context free languages
- context free
- syntactic pattern recognition
- predicate invention
- closure properties
- covering arrays
- production rules
- formal languages
- regular languages
- tree adjoining
- attribute grammars
- lexical semantics
- grammar induction
- artificial intelligence
- database
- xml schema
- multistage
- data model
- database systems