作者: Michael Gertz , Jan-Marco Bremer
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摘要: The structural aspects of the unified XML view are rigid enough to support data retrieval (DR) queries as known from database systems. Over past few years, increasingly powerful query language, most notably recent XQuery standard [2], have exploited this fact provide expressive DR capabilities for XML. On other hand, XML’s transparent treat arbitrary parts XML-represented documents. Document or information (IR) providing one important querying text-rich documents, however, is not supported by any earlier languages so far.