Keyphrases
- query answering
- cooperative
- data exchange
- data complexity
- integrity constraints
- conjunctive queries
- answering queries
- incomplete information
- data integration
- query rewriting
- data integration systems
- multi agent systems
- multi agent
- query answers
- inconsistent databases
- dl lite
- regular path queries
- closed world assumption
- open world
- data sets
- transitive roles
- query containment
- datalog programs
- data management
- case study