document: Online mining of frequent query trees over XML data streams In this paper , we proposed an online algorithm , called FQT-Stream ( Frequent Query Trees of Streams ) , to mine the set of all frequent tree patterns over a continuous XML data stream . A new numbering method is proposed to represent the tree structure of a XML query tree . An effective sub-tree numeration approach is developed to extract the essential information from the XML data stream . The extracted information is stored in an effective summary data structure . Frequent query trees are mined from the current summary data structure by a depth-first-search manner .
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