You can export the XML for the structure of a report using the Export Report button in the New Custom Report page. When you export a report, you can use the Save command to save the report structure to an XML file.
To export a report structure to an XML document:
Open the Report List.
Click Modify report for the report you want to export.
Click Export Report.
Click Save in the File Download dialog box.
Type a file name and select the folder to which you want to save the XML document.