Keyphrases
- schema evolution
- schema integration
- xml schema
- data model
- database schema
- databases
- object oriented databases
- schema versioning
- information systems
- database
- data transformation
- query language
- object model
- xml data
- database design
- object oriented
- management system
- decision making
- hierarchical structure
- decision support
- database systems
- exception handling
- semantically equivalent
- class hierarchies
- data sets