A method for classifying electronically posted documents includes receiving two posted documents and generating corresponding metadata summaries for each, wherein each of the metadata summaries includes at least one sub-tree structure. The structures of the two summary sub-trees within the respective...http://www.google.com.tw/patents/US7137065?utm_source=gb-gplus-share專利 US7137065 - System and method for classifying electronically posted documents
