Patent ID: 7440974
Filing Date: 2008-10-21
Classification: G06F,Y10S

Abstract:
1. A method of information extraction from a Web page using an initial wrapper which has become partially inoperative, comprising: wherein the initial wrapper comprises an initial set of rules for extracting information and for assigning labels from a wrapper set of labels to the extracted information; extracting strings from the Web page parsed in forward direction using the initial set of rules; analyzing the extracted strings according to the initial set of rules for assigning labels associated with the wrapper; assigning labels to those strings which satisfy the label rules; extracting strings from the Web page in backward/(opposite) direction using the initial set of rules; analyzing the extracted strings according to the set of rules for assigning labels associated with the wrappers; and assigning labels to those unlabeled strings from which satisfy the label rules; wherein the initial wrapper W comprises a triple (T, L, R), where T is an input tokenizer, L is a semantic label set and R is a set of extraction rules R={n}, where each rule n, is a triple (p,s,l), where p ε S