Patent ID: 8607140

Claim:
A method performed by data processing apparatus, the method comprising: obtaining a first version of a resource; obtaining a second version of the resource, the second version representing a change to the first version of the resource; determining feature data, wherein determining the feature data comprises determining content feature data that describes changes in the content from the first version to the second version, wherein determining content feature data comprises: calculating a term count difference based on a count of terms in the first version and a count of terms in the second version; calculating a delta term count based on: a number of terms deleted from the first version to produce the second version; a number of terms added to the first version to produce the second version; and a number of terms changed in the first version to produce the second version; creating content feature data based on the term count difference and the delta term count; creating a feature vector from the content feature data; providing the feature vector to a support vector machine, the support vector machine trained to classify the second version of the resource as having one of changes requiring a change notification or changes not requiring a change notification; and classifying the second version as requiring a change notification or not requiring a change notification based on output from the support vector machine.