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We present the logical "OLAP-XML Federation System" that enables the external data available in XML format to be used as virtual dimensions. Unlike the complex and time-consuming physical integration of OLAP and external data in current OLAP systems, our system makes OLAP queries referencing fast-changing external data possible. This demo shows the uses of XML data for selection and grouping and explains the query optimization and evaluation processes with a concrete example.dblp:conf/comad/YinP06a fatcat:a5sp3ggzzbhc5fizdczdva7umi