Keyphrases
- context free grammars
- xml schema
- xml documents
- context free languages
- grammatical inference
- xml data
- context free
- regular expressions
- relational databases
- xml queries
- databases
- object oriented
- metadata
- data exchange
- integrity constraints
- xml databases
- data model
- covering arrays
- attribute grammars
- conceptual model
- predicate invention
- xpath queries
- production rules
- grammar induction
- finite automata
- closure properties
- database
- decision trees
- tree adjoining