Discovering Frequent Substructures in Large Unordered Trees(2003)
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Abstractthis paper, we study a data mining problem of discovering frequent substructures in a large collection of semi-structured data, where both of the patterns and the data are modeled by labeled unordered trees. An unordered tree is a directed acyclic graph with a specified node called the root, and all nodes but the root have at most one parent. Each node is labeled by a symbol drawn from an alphabet. Such unordered trees can be seen as either a generalization of itemsets in relational...
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