Summary of results

“search.com” survey AltaVista, WebCrawler, WhoWhere, CNN Headlines,Lycos, Shareware.Com,AT&T 800 Directory, ...

time to automatically build wrappers

K = number of attributes

S = size of examples

useful?

learnable?

wrapper class

57 %

13 %

53 %

57 %

50 %

53 %

O(KS2)

O(S2K)

O(KS2)

O(KS4)

O(S2K+2)

O(KS)

HLRT

N-LR

OCLR

HOCLRT

N-HLRT

LR

total 70 %

Previous slide

Next slide

Back to first slide

View graphic version