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XML Schema Based Compressing Technology over XML Data Stream

Author: DiGuoFeng
Tutor: ZhangXiaoLin
School: Inner Mongolia University of Science and Technology
Course: Control Theory and Control Engineering
Keywords: XML data stream XML schema Dynamic Huffman Resolve Compression
CLC: TP311.10
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 1
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Abstract


With the modern society progressing towards information technology, to promote the rapid development of the Internet, a lot of information in various forms. Isolated, autonomous, heterogeneous information has been unable to meet the long-established Internet era people shared this information and the urgent need for data exchange. XML (eXtensible markup language) emerged in recent years to become the de facto standard for data exchange and said the Internet and e-commerce, have also associated with the XML data stream technology. XML data stream compression is one of the hot topics of research, data flow is different from the traditional, static, long-lasting and stable relationship data, it is dynamic, in rapid succession, the XML document, the data compression method can not meet the requirements of the data stream environment. Because conventional compression methods generally need to scan the data on both sides or even multi-pass analysis of the structure of the data before compression, but this way for the flow of data in the network would cause great delay. Therefore, how to effectively complete the XML data stream compression to save storage space and reduce transmission cost, at the same time if they can support direct query processing on compressed XML data stream to avoid decompression operation on the consumption of system resources has become an urgent need solve problems and research directions. This article is from the analysis of the characteristics of the operating environment of the XML data stream and XML data structure as XML Schema can improve the compression efficiency and the compression ratio of the entrance. XML Schema is a W3C officially recommended in 2001 \XML Schema as XML constraints, has been more widely used. Including all the XML data stream element type defined in XML Schema XML data streams meet. So, before the processing of the data stream, you can first analyze the XML Schema, to obtain the structure of the sequence of events that occur in the XML data stream, and thus determine the encoding of the elements of the sequence of events, the completion of the XML data stream compression. So although not as the first elements of the sequence of events again scanning frequency accuracy, but this method does not require scanning data stream can be relatively accurate frequency elements of the sequence of events, the compression process can be only one pass XML data stream environment suitable for network . Finally, this paper, compression test Experimental and performance analysis, from the experimental results, the compression algorithm is superior to the traditional algorithm in compression efficiency and compression ratio.

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