Keyphrases
- question answering
- database
- query processing
- range queries
- query language
- distributed information retrieval
- response time
- correct answers
- query evaluation
- query logs
- web search engines
- databases
- efficient processing
- text collections
- query formulation
- complex queries
- user queries
- answering queries
- web search
- open domain
- database queries
- cost model
- search queries
- retrieval model
- tree patterns
- document collections
- question answering systems