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Research on Encoding Scheme and Structural Join Algorithm of XML Data

Author: HuangYuan
Tutor: YangZuoZuo
School: Huazhong University of Science and Technology
Course: Applied Computer Technology
Keywords: Extensible Markup Language Coding scheme Structural Connections Optimization strategy
CLC: TP312.2
Type: Master's thesis
Year: 2006
Downloads: 147
Quote: 2
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XML, also known as the Extensible Markup Language , and has essentially become a standard of the transmission of data over the Internet . More widely used , how effective storage of these data , and has become a hot topic in today 's academic research . Structural connection method is undoubtedly the core operation of XML data query . In order to effectively support structure query , has been proposed XML data encoding scheme . The global interval encoding scheme can be a good support node structure of the relationship between the judge, and thus is commonly used in the structure connected . Nevertheless, the using global interval coding scheme of the XML document updating efficiency is poor , the need for the entire document to be re-encoded . Relative partial interval encoding update of the document can be a good solution , but it does not directly support the judgment of the structural relationship of the junction point , the structural join algorithm can not be used . Prefix code can not only support structure as a combination of the two , connected , and better documentation update efficiency , is a promising encoding scheme . In order to further improve the efficiency of document updates , classical prefix encoding Dewey encoding improvements obtained extended the Dewey encoding Ext - Dewey . Ext-Dewey encoded XML document tree during update operations , do not need the other nodes in the tree re - encoding with high efficiency. Furthermore, the design of the connection algorithm based on the structure of the Ext-Dewey encoding and matching algorithm of the parent - child relationship , do not use the classic algorithm used stack to save intermediate results , reducing the space overhead . Interval coding , to achieve an optimization algorithm , which do not need to use any index structure the unnecessary connections operation, improve the efficiency of the algorithm can be avoided in some cases . Finally , this optimization strategy used in connection Ext-Dewey - based coding algorithms . The experimental data show that the Ext-Dewey - coded connection - based algorithms is correct and optimized algorithm is not optimized before the performance generally improved .

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