Keyphrases
- xml data
- semi structured information
- xml documents
- xml databases
- data model
- xml queries
- relational databases
- query optimization
- query evaluation
- semi structured data
- querying xml data
- xml schema
- keyword search
- data sources
- query processing
- xpath queries
- data integration
- information integration
- relational and xml data
- relational data
- query language
- path expressions
- query decomposition
- xml query processing
- databases
- xml keys
- native xml
- xml trees
- semantic web
- relational database systems
- relational tables
- heterogeneous data sources
- labeling scheme
- cost model