Keyphrases
- schema mappings
- data exchange
- data integration
- xml schema
- query answering
- xml queries
- database schema
- schema matching
- data management
- databases
- schema evolution
- xml documents
- data model
- finite sets
- xml data exchange
- conjunctive queries
- data sources
- data complexity
- xml data
- data transformation
- high level declarative
- database
- xml databases
- building blocks
- high level specifications