Document signature
Keywords that summarize document
Should be function of document and position in hierarchy
Example
- Beware of the too-good-to-be-true baby that is sleeping and sleeping and doesn’t want to nurse. Especially monitor the number of wet diapers, as seriously jaundiced babies are lethargic.
- First level (Health): jaundice, dampen, dehydration, lethargic, forcibly, caregiver, laxative, disposable
- Second level (Health:Nursing): baby, water, monitor, newborn, hormone
Often ɝ%-10% terms useful for classification