Keyphrases
- encoding scheme
- xml data
- twig queries
- xml documents
- encoding schemes
- native xml databases
- data model
- query optimization
- xml databases
- relational databases
- xml queries
- query language
- query evaluation
- xml query processing
- genetic algorithm
- relational data
- xml schema
- query decomposition
- relational and xml data
- xpath queries
- keyword search
- query processing
- native xml
- semi structured data
- xml fragments
- information retrieval
- relational database systems
- labeling scheme
- object retrieval
- xml trees