Patent ID: 9703819
Date: 2017-07-11
CPC Classifications: G06F

Claim:
1. A computer-implemented method, the method comprising: determining a delta index based on a difference between a first version and a second version of a document, wherein the first version is associated with a first index comprising a plurality of keywords appeared in the first version, wherein the step of determining comprises: evaluating the difference between the first and second versions from at least one of the factors including: generating the delta index for the difference between the first and second versions if the delta index meets a first threshold, wherein the delta index comprises a first section including information about one or more keywords affected by the difference and the information about the positions of the affected keywords, wherein the information about positions of the affected keywords includes information about addition and/or removal of the one or more keywords, wherein the delta index further comprises a second section including information about position changes between the first and second versions; and determining, for a at least one keyword, whether the keyword is found in a complete index or the delta index; in response to determining that the at least one keyword is in the complete index, performing: in response to determining that the at least one keyword is in the delta index, performing: