Keyphrases
- relation extraction
- named entities
- coreference resolution
- entity extraction
- automatic extraction
- information extraction
- named entity recognizer
- semantic role labeling
- question answering
- domain specific
- dependency tree
- named entity recognition
- co occurrence
- broad coverage
- semantic features
- knowledge base
- dependency trees
- natural language processing
- expert systems
- tree kernels
- information retrieval