Keyphrases
- query answering
- owl ontologies
- ontology languages
- data exchange
- data integration
- database schema
- integrity constraints
- data complexity
- conjunctive queries
- incomplete information
- answering queries
- production rules
- description logics
- domain ontology
- semantic annotation
- knowledge base
- schema mappings
- datalog programs
- dl lite
- query answers
- domain experts
- artificial intelligence
- databases