Keyphrases
- xml data
- labeling scheme
- xml documents
- xml databases
- data model
- xml queries
- query optimization
- relational databases
- xml query processing
- query processing
- query evaluation
- query language
- keyword search
- xml schema
- semi structured data
- xpath queries
- relational tables
- relational data
- relational database systems
- knowledge representation
- xml trees
- data sources
- database