Keyphrases
- xml queries
- tree patterns
- xml data
- xml documents
- xml databases
- data exchange
- conjunctive queries
- query evaluation
- join algorithms
- relational data
- query optimization
- xml query processing
- xml schema
- integrity constraints
- data model
- relational databases
- relational database systems
- sql queries
- keyword search
- transitive closure
- data mining
- schema mappings
- complex objects
- semi structured
- nearest neighbor
- query processing
- twig queries