Efficient query processing of XML data using XML index
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United States of America Patent
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Jul 8, 2008
Grant Date -
Oct 13, 2005
app pub date -
Sep 16, 2004
filing date -
Apr 9, 2004
priority date (Note) -
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Abstract
A method and apparatus is provided for translating queries, such as path expressions and SQL/XML constructs, into SQL statements to be executed against an XML index, which improves processor time as opposed to applying path expressions directly to the original XML documents to extract the desired information. Simple path expressions, filter expressions, descendant axes, wildcards, logical expressions, relational expressions, literals, and other path expressions are all translated into SQL for efficient querying of an XML index. Similarly, rules for translating SQL/XML constructs into SQL are provided.
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