Enabling users to drill through data categories
Sometimes data objects created in BIRT Designer Professional, contain links to enable users to drill through the data hierarchy in the data object to view either summary or detail information. For example, consider data organized in years, that contains a quarter-month-week hierarchy. If the data object contains defined hyperlinks for this hierarchy, choosing a year displays the quarters that make up the year, choosing a quarter displays the months in the quarter, and so on.

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