Keyphrases
- xml data
- metadata
- xml documents
- xml databases
- data model
- xml schema
- xml queries
- query optimization
- relational databases
- xml format
- xpath queries
- query processing
- semi structured data
- relational data
- query evaluation
- query language
- query decomposition
- digital libraries
- keyword search
- relational and xml data
- querying xml data
- databases
- database
- labeling scheme
- efficient query processing
- multi dimensional
- xml fragments
- native xml
- relational database systems
- data integration
- xml data sources
- semi structured information
- standard for data exchange
- information extraction