Keyphrases
- schema integration
- xml databases
- integrity constraints
- xml documents
- relational databases
- heterogeneous databases
- database integration
- xml data
- object oriented databases
- keyword search
- xml schema
- semi structured
- schema matching
- multidatabase systems
- scientific data
- relational database systems
- database
- query optimization
- structured data
- data model
- databases
- heterogeneous data
- materialized views
- object oriented
- knowledge discovery