Keyphrases
- question answering
- information retrieval
- natural language processing
- question answering systems
- natural language
- passage retrieval
- named entities
- information extraction
- relation extraction
- cross language
- syntactic information
- qa clef
- question classification
- sentence retrieval
- natural language questions
- data mining
- expert systems
- semantic roles
- artificial intelligence
- candidate answers
- textual entailment recognition