In recent years, XML (Extensible Markup Language) has become new standard of data representation as well as data exchange on the Internet.Though with sound achievements of XML research, there are in theories and performances still many difficulties for XML query technology because of its inherent characteristics. With a profound research in XML query technology, this
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XML information retrieval syslem differs greatly from traditional information retrieval system in the construction of both inverted text index and structural index, the evaluation of both keyword based query and structure based query, and the effects of structural information on result relevance ranking. To manage large-scale XML documents with complicated structure, this dissertation focus on
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