Keyphrases
- xml data
- xml documents
- xml databases
- xml queries
- relational databases
- data model
- query processing
- query optimization
- query evaluation
- relational data
- query language
- xpath queries
- semi structured data
- xml schema
- keyword search
- relational database systems
- relational and xml data
- querying xml data
- semi structured information
- query decomposition
- xml query processing
- labeling scheme
- xml fragments
- databases
- hierarchical data
- queries on xml data
- standard for data exchange
- xml data sources
- xml trees
- keyword queries