An Extensible Markup Language (XML) file that extends the report design (.rptdesign) file format to support Actuate BIRT technology. An Actuate BIRT report design file contains the complete description of a report, including Actuate BIRT data objects, information object and report document data sources, Flash objects, and HTML buttons. A report developer uses BIRT Designer Professional or Actuate BIRT Studio to create the report design file. The BIRT Report Engine processes that file to create a formatted report.