Keyphrases
- question answering
- knowledge base
- databases
- natural language processing
- expert systems
- information retrieval
- syntactic information
- natural language
- data model
- knowledge representation
- information extraction
- relation extraction
- cross language
- named entities
- natural language questions
- question classification
- database schema
- wordnet
- query interface
- qa clef
- xml schema
- passage retrieval
- semantic roles
- sentence retrieval
- database
- machine learning
- information retrieval systems
- qa systems
- probabilistic model
- answering questions
- query language