Keyphrases
- xml data
- xml documents
- data model
- query processing
- xml databases
- query optimization
- relational databases
- semi structured data
- xml queries
- relational data
- query language
- query evaluation
- xml schema
- keyword search
- relational and xml data
- querying xml data
- path expressions
- relational database systems
- xml query processing
- native xml
- xpath queries
- xml fragments
- xml keyword search
- semi structured information
- queries on xml data
- cost model
- database
- data integration
- object oriented
- databases