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The increasing availability of heterogeneous XML informative sources has raised a number of issues concerning how to represent and manage semistructured data. Although XML sources can exhibit proper structures and contents, differently annotated XML documents may in principle encode related semantics due to subjective definitions of markup tags. Discovering knowledge to infer semantic organization of XML documents has become a major challenge in XML data management. This paper addresses the problem of clustering XML data according to structure as well as content features enriched with lexical ontology knowledge.
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