Keyphrases
- xml data
- xml documents
- xml databases
- data model
- xml queries
- query processing
- query optimization
- relational data
- relational databases
- semi structured data
- query evaluation
- xml schema
- keyword search
- query language
- relational and xml data
- query decomposition
- relational database systems
- querying xml data
- xpath queries
- semi structured information
- xml query processing
- queries on xml data
- xml data sources
- native xml
- regular expressions
- semi structured
- expressive power