Ontology-Enabled XML Search
XML is rapidly evolving towards the standard for data integration and exchange over the Internet and within intranets, covering the complete spectrum from largely unstructured, ad hoc documents to highly structured, schematic data. However, established XML query languages like XML-QL  or XQuery  cannot cope with the rapid growth of information in open environments such as the Web or intranets of large corporations, as they are bound to boolean retrieval and do not provide any relevance ranking for the (typically numerous) results. Recent approaches such as XIRQL  or our own system XXL [295, 296] that are driven by techniques from information retrieval overcome the latter problem by considering the relevance of each potential hit for the query and returning the results in a ranked order, using similarity measures like the cosine measure. But they are still tied to keyword queries, which is no longer appropriate for highly heterogeneous XML data from different sources, as it is the case in the Web or in large intranets.
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