Keyphrases
- xml data
- xml documents
- data model
- xml databases
- relational databases
- xml queries
- query optimization
- relational data
- query decomposition
- query language
- query evaluation
- xml schema
- semi structured data
- querying xml data
- query processing
- xml query processing
- relational and xml data
- keyword search
- data integration
- relational database systems
- labeling scheme
- hierarchical data
- xml keyword search
- structured data
- path expressions
- relational tables
- native xml
- native xml databases
- databases