Keyphrases
- query evaluation
- query processing
- data objects
- query containment
- query language
- efficient processing
- moving objects
- query logs
- d objects
- set valued attributes
- datalog queries
- database objects
- tree patterns
- object model
- response time
- complex objects
- web search engines
- object level
- retrieval systems
- objects moving
- query optimization
- complex queries
- database
- closely related
- spatial relations
- user queries
- answering queries
- set valued