Keyphrases
- integrity constraints
- join operations
- xml data
- xml queries
- xml documents
- path expressions
- relational database systems
- xml databases
- join algorithms
- xml schema
- query optimization
- relational data
- data model
- query processing
- relational databases
- functional dependencies
- semi structured data
- tree structures
- keyword search
- query evaluation
- structured data
- query language
- efficient processing
- sql queries
- databases
- tree patterns
- query plan
- distributed databases
- multi dimensional
- data structure
- database systems
- database