Keyphrases
- question answering
- information retrieval
- natural language
- natural language processing
- information extraction
- question classification
- qa clef
- natural language questions
- passage retrieval
- cross language
- syntactic information
- relation extraction
- semantic roles
- named entities
- answer extraction
- sentence retrieval
- semantic role labeling
- data mining
- qa systems
- answer validation
- open domain question answering