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With the rise of XML as a standard for representing business data, XML datawarehousing 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 allowmuch-needed performance optimizations on analytical queries expressed inXQuery, defining an algebra is desirable. However, XML-OLAP (XOLAP) algebrasfrom the literature still largely rely on the relational model. Hence, wepropose in this paper a rollup operator based on a pattern tree in order tohandle multidimensional XML data expressed within complex hierarchies.

Pattern tree-based XOLAP rollup operator for XML complex hierarchies