Keyphrases
- digital libraries
- database
- query processing
- response time
- query evaluation
- query expansion
- range queries
- user queries
- advanced technology
- query formulation
- data structure
- search engine
- electronic commerce
- metadata
- keyword search
- retrieval method
- federated search
- technology advances
- data sources
- query language
- data objects
- search queries
- database queries
- multimedia