Keyphrases
- xml data
- twig queries
- xml queries
- xml query processing
- query evaluation
- xml documents
- efficient query processing
- xml databases
- native xml databases
- data model
- structural join
- query language
- labeling scheme
- query optimization
- semi structured data
- relational data
- relational databases
- object retrieval
- hierarchical data
- xpath queries
- efficient processing
- disk space
- queries on xml data
- encoding scheme
- xml schema
- path expressions
- relational database systems
- keyword search
- query processing
- xml fragments
- probabilistic xml
- information retrieval
- xml trees
- query decomposition
- pattern matching
- databases