White Papers

Mixed Mode XML Query Processing

Overview Querying XML documents typically involves both tree-based navigation and pattern matching similar to that used in structured information retrieval domains. This paper shows that for good performance, a native XML query processing system should support query plans that mix these two processing paradigms. The paper describes the prototype native XML system, and report on experiments demonstrating that even for simple queries, there are a number of options for how to combine tree-based navigation and structural joins based on information retrieval-style inverted lists, and that these options can have widely varying performance. The paper presents ways of transparently using both techniques in a single system, and provides a cost model for identifying efficient combinations of the techniques.

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Publisher: University of Wisconsin-Madison
File Format: PDF
Date Published: Dec 4, 2008
Format: White Papers
Topics: XML, Programming Languages

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