Keyphrases
- tree patterns
- xml queries
- semistructured data
- querying xml documents
- tree structured data
- xml files
- xml documents
- xml data
- xml databases
- exact learning
- xml schema
- structural features
- data exchange
- parent child
- pattern languages
- xml format
- tree structures
- join algorithms
- tree structured patterns
- data model
- relational database systems
- unordered trees
- semi structured
- metadata
- relational data
- twig queries
- rooted trees
- query processing
- structured data