Keyphrases
- data sources
- database
- query processing
- user interaction
- query evaluation
- relevance feedback
- data structure
- service oriented
- user queries
- federated search
- complex queries
- database queries
- query expansion
- response time
- object oriented
- distributed systems
- service providers
- integrity constraints
- management system
- digital libraries
- query formulation
- lightweight
- vector space
- range queries
- data model
- service composition
- keywords
- website