Keyphrases
- data exchange
- query answering
- answering queries
- relational queries
- unions of conjunctive queries
- query answers
- query rewriting
- data integration
- query containment
- schema mappings
- database schema
- conjunctive queries
- xml data exchange
- complexity of query answering
- data management
- xml queries
- data complexity
- data model
- query processing
- open world
- query language
- data sources
- relational data
- relational databases
- inconsistent databases
- closed world
- integrity constraints
- probabilistic databases
- xml schema
- tuple generating dependencies
- relational calculus
- consistent answers
- query evaluation
- data sets
- object oriented
- datalog programs
- np complete
- target schema
- source schema
- database
- consistent query answering
- incomplete information