Keyphrases
- relation extraction
- domain specific
- dependency trees
- rule language
- automatic extraction
- information extraction
- semantic relations
- named entities
- domain knowledge
- broad coverage
- natural language text
- semantic role labeling
- named entity recognition
- semantic features
- general purpose
- background knowledge
- question answering
- production rules
- domain ontology
- semantic representation
- ontology learning
- association rules
- natural language
- owl ontologies
- knowledge acquisition