Keyphrases
- query terms
- query processing
- response time
- database
- query evaluation
- boolean formulae
- keywords
- relevance feedback
- database queries
- term dependence
- data structure
- term dependencies
- search space
- user queries
- query expansion
- first order logic
- complex queries
- query formulation
- relevance model
- original query
- inverted lists
- term selection
- retrieval method
- horn clauses
- retrieval effectiveness
- background knowledge
- data sources