Keyphrases
- xml data
- xml documents
- data model
- query optimization
- query processing
- relational databases
- query evaluation
- xml queries
- xml databases
- query language
- relational data
- querying xml data
- keyword search
- relational database systems
- semi structured data
- xpath queries
- query decomposition
- relational and xml data
- xml schema
- xml keys
- database
- hierarchical data
- integrity constraints
- xml query languages
- object oriented
- xml fragments
- native xml databases
- database systems
- databases