Keyphrases
- xml data
- query evaluation
- query processing
- semi structured information
- semi structured data
- standard for data exchange
- xpath queries
- keyword search
- query result
- querying xml data
- xml documents
- xml databases
- query decomposition
- xml query processing
- xml queries
- query optimization
- path expressions
- queries on xml data
- data model
- relational databases
- keyword queries
- path queries
- tree pattern queries
- native xml databases
- relational data
- xml schema
- relational database systems
- recursive queries
- query language
- query execution
- deep web
- xml fragments
- xml views
- xml data sources
- database
- xml query languages
- user queries
- web documents
- web pages
- extensible markup language
- query rewriting
- twig queries
- xpath expressions
- database systems
- search engine
- information retrieval
- databases
- data management
- range queries
- inverted index
- join algorithms
- cost model
- keywords
- relational tables
- xml trees
- data sources
- transitive closure
- xml keys
- conjunctive queries