Pattern tree-based XOLAP rollup operator for XML complex hierarchies

—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.

• Type: Journal
• Year: 2011
• Where: CORR
• Authors: Marouane Hachicha, Jérôme Darmont
• Keywords: CORR 2011, Education, XML Data, XML Data Cubes, XML Data Warehousing