Methods of Excel COM objects

Hi,

I am exploring the possibilities of Excel automation using matlab. Are there any referable online documentations for the various Excel COM object methods that are available? I see that there are a lot of methods but am finding it difficult to comprehend how to use them.

For instance, i came across this function,

o_objExcel.Workbooks.Item(1).SaveAsXMLData();

which presumably save a workbook as an XML file. But when i try to execute this, i get an error

No method 'SaveAsXMLData' with matching signature found for class
'Interface.000208DA_0000_0000_C000_000000000046'

Quite obviously, i am using the method wrong. Hence my question. Are there any documentation (by mathworks or external) that can be refered for this?

Thanks in advance,

Regards,

Giri