Keyphrases
- xml data
- xml documents
- query optimization
- disk space
- data model
- xml databases
- xml queries
- relational databases
- query evaluation
- relational data
- xml schema
- query processing
- digital libraries
- keyword search
- query language
- semi structured data
- relational and xml data
- data structure
- relational database systems
- path expressions
- xml fragments
- metadata
- query decomposition
- querying xml data
- storing and querying xml
- xpath queries
- semi structured information
- native xml
- xml data sources
- database management systems
- xml keys
- standard for data exchange