Keyphrases
- semi structured
- relation extraction
- information extraction
- free text
- web documents
- text mining
- dependency tree
- broad coverage
- structured data
- structured knowledge
- natural language text
- named entities
- dependency trees
- wrapper induction
- named entity recognition
- information retrieval
- higher level
- textual data
- automatic extraction
- named entity recognizer
- website
- domain knowledge
- question answering
- domain specific
- natural language processing
- keywords
- semantic role labeling
- knowledge base
- text documents
- semantic relations
- tree kernels
- knowledge acquisition
- data sets
- data model
- domain ontology
- expert systems
- knowledge representation
- semantic information
- data analysis
- html documents
- knowledge based systems
- natural language
- data sources
- database