Keyphrases
- question answering
- named entities
- information extraction
- coreference resolution
- natural language processing
- relation extraction
- named entity recognition
- question classification
- information retrieval
- natural language
- cross language
- qa systems
- passage retrieval
- question answering systems
- syntactic information
- qa clef
- answer extraction
- data mining
- open domain question answering
- noun phrases
- artificial intelligence
- wordnet
- probabilistic model
- answer validation