Keyphrases
- query optimization
- xml data
- xml documents
- cost model
- query processing
- xml databases
- data model
- database systems
- multidatabase systems
- xml queries
- cost estimation
- query processing and optimization
- relational databases
- query execution
- xml schema
- cardinality estimation
- efficient query processing
- semi structured data
- query language
- continuous queries
- query evaluation
- query scheduling
- query execution plans
- query result
- labeling scheme
- keyword search
- semantic query optimization
- relational database systems
- databases
- approximate query answering
- metadata
- query rewriting
- path expressions
- semi structured
- data exchange
- recursive queries
- query optimizer
- multi dimensional
- object oriented
- semistructured data
- selectivity estimation
- join queries
- efficient execution
- query optimizers
- storage structures