Keyphrases
- relation extraction
- automatic extraction
- information extraction
- named entities
- semantic relations
- domain specific
- semantic features
- web pages
- dependency tree
- broad coverage
- question answering
- semantic role labeling
- reference resolution
- named entity recognition
- parse tree
- dependency trees
- data mining
- semantic web
- information sources
- natural language processing
- artificial intelligence
- visual features
- higher order