Keyphrases
- xml data
- xml documents
- data model
- xml databases
- relational databases
- query processing
- xml queries
- query optimization
- keyword search
- relational data
- query evaluation
- query language
- xml schema
- relational and xml data
- query decomposition
- xpath queries
- semi structured data
- path expressions
- querying xml data
- xml keyword search
- semi structured information
- relational database systems
- historical data
- queries on xml data
- databases
- native xml
- hierarchical data
- xml views
- xml fragments
- xml query evaluation