Keyphrases
- question answering
- natural language processing
- natural language
- information retrieval
- named entities
- information extraction
- question classification
- cross language
- qa clef
- question answering systems
- natural language questions
- passage retrieval
- syntactic information
- textual entailment recognition
- sentence retrieval
- answer extraction
- qa systems
- semantic roles
- relation extraction
- keywords
- search engine