Keyphrases
- question answering
- natural language processing
- information extraction
- information retrieval
- question classification
- text mining
- natural language
- cross language
- question answering systems
- passage retrieval
- open domain question answering
- syntactic information
- qa clef
- named entities
- relation extraction
- sentence retrieval
- natural language questions
- text summarization
- semantic roles
- text classification
- keywords
- answer extraction
- relational databases
- textual entailment recognition
- answering questions
- data mining
- search queries
- keyword search
- information retrieval systems