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With increasing amounts of data being exchanged and even generated or stored in XML, a natural question is how to perform OLAP on XML data, which can be structurally heterogeneous (e.g., parse trees) and/or marked-up text documents. A core operator for OLAP is the data cube. While the relational cube can be extended in a straightforward way to XML, it is argued such an extension would not address the specific issues posed by XML. While in a relational warehouse, facts are flat records and dimensions may have hierarchies, in an XML warehouse, both facts and dimensions may be hierarchical. The challenges introduced by these features of XML are identified for cube definition and computation.

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Format:PDFSize:208 KB
Date:May 2007
Pages:10

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