Pattern tree-based XOLAP rollup operator for XML complex hierarchies

Marouane Hachicha, J. Darmont
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Abstract

With the rise of XML as a standard for representing business data, XML data warehousing appears as a suitable solution for decision-support applications. In this context, it is necessary to allow OLAP analyses on XML data cubes. Thus, XQuery extensions are needed. To define a formal framework and allow much-needed performance optimizations on analytical queries expressed in XQuery, defining an algebra is desirable. However, XML-OLAP (XOLAP) algebras from the literature still largely rely on the relational model. Hence, we propose in this paper a rollup operator based on a pattern tree in order to handle multidimensional XML data expressed within complex hierarchies.
用于XML复杂层次结构的基于模式树的XOLAP汇总运算符
随着XML作为表示业务数据的标准的兴起,XML数据仓库成为决策支持应用程序的合适解决方案。在这种情况下,有必要允许对XML数据集进行OLAP分析。因此,需要XQuery扩展。要定义一个正式的框架并允许对用XQuery表示的分析查询进行急需的性能优化,需要定义一个代数。然而,文献中的XML-OLAP (XOLAP)代数仍然在很大程度上依赖于关系模型。因此,我们在本文中提出了一个基于模式树的汇总运算符,以便处理在复杂层次结构中表示的多维XML数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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