Keyphrases
- query answering
- cooperative
- data integration systems
- data exchange
- data integration
- conjunctive queries
- data complexity
- integrity constraints
- data sources
- ontology languages
- answering queries
- semantic web
- dl lite
- ontology mappings
- data model
- open world
- incomplete information
- metadata
- databases
- knowledge base
- linked data
- relational data
- multi agent systems
- multi agent
- inconsistent databases
- xml schema
- rdf data
- query rewriting
- datalog programs
- schema mappings
- query language
- query containment
- xml data exchange
- query processing
- query answers
- computational complexity