XML Data Mapping in Excel 2003 : Saving the workbook to xml data file

Pre-requisite:
Make sure there is no other Excel instance in your system before you run the sample code. For more information about how to make Office application quite after automation, please refer to the following KB:317109 - Office application does not quit after automation from Visual Studio .NET client
Excel 2003 should be installed on the machine where this application is running.
 
Before performing save operation, the cells should be mapped to the proper XML node first. Here are the steps,
1. Open the excel file
2. Create an XML map object and add the schema to the XXML map object
3. Check if there has already been ListObject in the workbook, if not add a listobject to the workbook. When a mapping is done between cells and xml node, there    
    should be a ListObject.
4. Map each cell to the appropriate node using the range object.
5. Check whether this excel can be exportable using the IsExportable property of the map object.
6. Save the excel file as ‘SaveAsXMLData’ and it creates a XML data file.
 
 
// Map special Range to the schema.
Excel.Worksheet sheet = (Excel.Worksheet)oExcel.ActiveSheet;
sheet.ListObjects.Add(Excel.XlListObjectSourceType.xlSrcRange, sheet.get_Range(sheet.Cells[1,1], sheet.Cells[2,7]), oOpt, Excel.XlYesNoGuess.xlYes, oOpt);
sheet.ListObjects[1].ListColumns[1].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/Column1", oOpt, true);
sheet.ListObjects[1].ListColumns[2].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column2", oOpt, true);
sheet.ListObjects[1].ListColumns[3].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column3", oOpt, true);
sheet.ListObjects[1].ListColumns[4].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column4", oOpt, true);
sheet.ListObjects[1].ListColumns[5].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column5", oOpt, true);
sheet.ListObjects[1].ListColumns[6].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column6", oOpt, true);
sheet.ListObjects[1].ListColumns[7].XPath.SetValue(oExcel.ActiveWorkbook.XmlMaps[1], "/Root/Row/ Column7", oOpt, true);
 
 
 

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Using the Excel 2003 Object Model to Add XML Data Integration
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_xl2003_ta/html/odc_xl_Excel2003XMLIntro.asp
 
XPath Object
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbaxl11/html/xlobjXPath_HV01030950.asp
 
ListObject Object
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbaxl11/html/xlobjListObject_HV01031546.asp