2. The computer implemented method of claim 1 , wherein the communications of the cluster include structured communications that are each structured using a given markup language, wherein the given markup language is eXtensible Markup Language or Hypertext Markup Language, and wherein determining the cluster of the communications is further based on similarity of structural paths of the structured communications of the cluster, the structural paths each referencing an address to reach a node, of the given markup language, in a corresponding structured communication.
2. The computer implemented method of claim 1 , wherein the communications of the cluster include structured communications that are each structured using a given markup language, wherein the given markup language is eXtensible Markup Language or Hypertext Markup Language, and wherein determining the cluster of the communications is further based on similarity of structural paths of the structured communications of the cluster, the structural paths each referencing an address to reach a node, of the given markup language, in a corresponding structured communication. 3. The computer implemented method of claim 2 , wherein determining the feature set comprises: determining structural features of the features based on the structural paths of the structured communications of the cluster, the structural features indicating at least one of: hierarchical structure of the structural paths, and node types of the nodes of the structural paths.