Keyphrases
- query rewriting
- xpath queries
- xml views
- query optimization
- view definitions
- data model
- query answering
- data integration
- xml data
- xml queries
- conjunctive queries
- databases
- xml schema
- xml documents
- database schema
- spatial databases
- database
- xml databases
- tree patterns
- query execution
- query evaluation
- object oriented
- cost model
- integrity constraints
- query processing
- database systems
- data representation
- semantic web
- complex queries
- data quality
- schema mappings
- metadata
- data exchange