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What is Node of XML Document Tree

Chapter 12
Emerging Technologies and Applications in Data Processing and Management
The node of an XML document tree can be defined as a triple ( id , label , < text >), in which id is an identifier that uniquely identifies a node, label is the corresponding element or the attribute name, and text is the text content or attribute value of the corresponding element.
Published in Chapter:
Efficient Storage and Parallel Query of Massive XML Data in Hadoop
Wei Yan (Liaoning University, China)
Copyright: © 2019 |Pages: 21
DOI: 10.4018/978-1-5225-8446-9.ch012
Abstract
In order to solve the problem of storage and query for massive XML data, a method of efficient storage and parallel query for a massive volume of XML data with Hadoop is proposed. This method can store massive XML data in Hadoop and the massive XML data is divided into many XML data blocks and loaded on HDFS. The parallel query method of massive XML data is proposed, which uses parallel XPath queries based on multiple predicate selection, and the results of parallel query can satisfy the requirement of query given by the user. In this chapter, the map logic algorithm and the reduce logic algorithm based on parallel XPath queries based using MapReduce programming model are proposed, and the parallel query processing of massive XML data is realized. In addition, the method of MapReduce query optimization based on multiple predicate selection is proposed to reduce the data transfer volume of the system and improve the performance of the system. Finally, the effectiveness of the proposed method is verified by experiment.
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