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Research on XPath Query Model

Author: LiLiWen
Tutor: LiuXianFeng
School: Hunan Normal University
Course: Computer Software and Theory
Keywords: XML data stream XPath queries Stream index Predicate expression
CLC: TP311.52
Type: Master's thesis
Year: 2010
Downloads: 50
Quote: 3
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Abstract


With the continuous development of XML technology and its applications continues to expand , more and more data in XML to describe , store and exchange XML data stream query research has become a hot area of ??research of XML technology . User queries are usually expressed in XPath language . XML stream data arrives , the query processing system based on user input matches the XPath query expressions with XML data stream in real time the return match results . Under normal circumstances, the system need to handle a large number of XPath queries from users , timely, efficient returns the query results to the user is the key to the study of XML query . Based on the XPath query expression analysis , take note of the fact that : multiple XPath query expression has a certain degree of similarity , they may have the same predicate expressions items , if we can reduce these same predicate expressions items calculation , can effectively improve query efficiency . Based on this, in combination with the XML stream index path query technology, this paper presents a new approach based on XPath query predicate processing flow index , and the design and implementation of the predicate processing method to deal with the predicate of the XPath query model . Work and contribution of this paper is as follows : 1, first introduced the XML data stream query in the research status and XML related technologies , and in-depth study of several popular XPath query model , focusing on the automata - based XPath query model analyzed . 2 , a commonly used predicate approach - based on the analysis of the shared path predicate approach proposed based flow index predicate processing methods . The basic idea of the method , and gives the model structure and predicate processing algorithms , introduced predicate processor handling mechanism , and the optimization of the processing method of the predicate measures . 3 , is designed and implemented using flow index predicate - based approach to XPath query processing predicate expression model analysis of the design ideas of the model and model framework . Proved by experiments : stream index - based XPath query model can effectively improve query efficiency , suitable for processing large documents and complex XPath queries .

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