Record-Boundary Discovery in Web Documents
Record-Boundary Discovery Larger Goal: Information Extraction
Desired Objective Query the Web Like a Database
Approach and Limitations Automatic Ontology-Based Wrapper Generation
Application Ontology: Object-Relationship Model Instance
Application Ontology: Data Frames
Ontology Parser
Record Extractor
Record Extractor: High Fan-Out Heuristic
Record Extractor: Record-Separator Heuristics
IT: Identifiable “html separator” Tags
HT: Highest-count Tags
SD: Standard Deviation
OM: Ontological Match
RP: Repeating-tag Patterns
Record Extractor: Consensus Heuristic
Record Extractor: Example Consensus Heuristic
Record Extractor: Results
Constant/Keyword Recognizer
Database Instance Generator
Database-Instance Generator
Recall & Precision
Results: Car Ads
Car Ads: Comments
Results: Computer Job Ads
Results: Obituaries
Cautions
Conclusions
Email: embley@cs.byu.edu
Home Page: http://www.deg.byu.edu
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