Keyphrases
- expressive power
- query answering
- deductive databases
- datalog programs
- natural language
- query language
- grammatical inference
- context free grammars
- logic programming
- visual languages
- transitive closure
- integrity constraints
- natural language processing
- finite state automata
- syntactic pattern recognition
- relational algebra
- ontology based data access
- parse selection
- context free
- recursive programs
- phrase structure
- predicate invention
- first order logic
- existentially quantified
- mildly context sensitive
- dl programs
- database languages
- context free languages
- relational calculus
- databases
- data complexity
- incomplete information